全无机钙钛矿量子点CsPbI_(3)拥有出色的光学性能,适用于红光的发光器件及太阳能电池领域。同时,组分原子半径相差较大,且软晶格导致卤素离子迁移,会导致CsPbI_(3)量子点发生相变,即失效。利用铅基金属有机框架(Pb metal organic framew...全无机钙钛矿量子点CsPbI_(3)拥有出色的光学性能,适用于红光的发光器件及太阳能电池领域。同时,组分原子半径相差较大,且软晶格导致卤素离子迁移,会导致CsPbI_(3)量子点发生相变,即失效。利用铅基金属有机框架(Pb metal organic framework,Pb-MOF)作为钙钛矿中的铅源,合成CsPbI_(3)量子点(CsPbI_(3)@Pb-MOF-OLAMI)。结果表明,其热稳定性提升了40%,而光照稳定性在经过碘化铅(PbI_(2))离子源溶液的修复后,提升了15倍。这种稳定性的改善主要源于孔洞限制效应,即Pb-MOF的多孔结构阻碍或减缓卤素离子的迁移,避免或减少缺陷的形成,也就抑制了钙钛矿变性过程。该研究为改善钙钛矿量子点CsPbI_(3)的稳定性提供了新思路。展开更多
Inorganic cesium metal halide perovskites have gained research interest as absorbers in perovskite solar cells due to their superior thermal stability.Among these,CsPbI2Br,with a narrower band gap than CsPbBr3 and a b...Inorganic cesium metal halide perovskites have gained research interest as absorbers in perovskite solar cells due to their superior thermal stability.Among these,CsPbI2Br,with a narrower band gap than CsPbBr3 and a better phase stability than CsPbI3,has received tremendous interest of the researchers.However,CsPbI2 Br takes adverse phase transfer easily with an exposure to the water vapor in ambient air which not only brings inconvenience for researches but also puts forward very high requirement for encapsulation.Herein,a dense and uniform film is obtained by incorporating hydrophobic CH3NH3Cl(MACl)into the precursor solution.Being attributed to a good passivation effect,the defect density is decreased from3.12×1016 to 1.49×1016 cm-3 and the average photoluminescence lifetime is increased from 8.84 to 20.6 ns.The photovoltaic device achieves a high open-circuit voltage of 1.22 V based on optimized MACl-doped film and accordingly a higher power conversion efficiency(PCE) of 12.9% which is 21.7% higher than the pristine CsPbI2Br device with PCE of 10.6%.In addition,the ambient stability of MACl-doped device has been enhanced,which is greatly attributed to the hydrophobic properties of MACl.This work provides a clue to improve ambient stability of inorganic perovskite solar cells and inspires toward further development of this material.展开更多
Interface engineering has been regarded as an effective and noninvasive means to optimize the performance of perovskite solar cells(PSCs).Here,doping engineering of a ZnO electron transport layer(ETL)and CsPbI3/ZnO in...Interface engineering has been regarded as an effective and noninvasive means to optimize the performance of perovskite solar cells(PSCs).Here,doping engineering of a ZnO electron transport layer(ETL)and CsPbI3/ZnO interface engineering via introduction of an interfacial layer are employed to improve the performances of CsPbI3-based PSCs.The results show that when introducing a TiO2 buffer layer while increasing the ZnO layer doping concentration,the open-circuit voltage,power conversion efficiency,and fill factor of the CsPbI3-based PSCs can be improved to 1.31 V,21.06%,and 74.07%,respectively,which are superior to those of PSCs only modified by the TiO2 buffer layer or high-concentration doping of ZnO layer.On the one hand,the buffer layer relieves the band bending and structural disorder of CsPbI3.On the other hand,the increased doping concentration of the ZnO layer improves the conductivity of the TiO2/ZnO bilayer ETL because of the strong interaction between the TiO2 and ZnO layers.However,such phenomena are not observed for those of a PCBM/ZnO bilayer ETL because of the weak interlayer interaction of the PCBM/ZnO interface.These results provide a comprehensive understanding of the CsPbI3/ZnO interface and suggest a guideline to design high-performance PSCs.展开更多
All-inorganic halide perovskite solar cells(PSCs)have acquired great progress,especially CsPbI2Br.However,their photoelectric conversion efficiency(PCE)remains far below the theoretical predictions.Non-radiative recom...All-inorganic halide perovskite solar cells(PSCs)have acquired great progress,especially CsPbI2Br.However,their photoelectric conversion efficiency(PCE)remains far below the theoretical predictions.Non-radiative recombination is one of the important issues affecting the photoelectric performance of the PSCs,and the defective lead ions derived from the evaporation of halide ions in the inorganic perovskite are the principal non-radiative recombination centers.Herein,the non-radiative recombination is effectively suppressed by introducing the N-methyl-2-pyrrolidone(NMP)as a Lewis base molecule to passivate the defective lead ions.Therefore,by adjusting the dosage of NMP,the smooth and pinhole-free CsPbI_(2)Br perovskite film is obtained and the optimized device exhibits a champion PCE of 16.77%with an excellent fill factor(FF)of 0.80.This work proves the effectiveness of passivation using Lewis base molecules to prevent non-radiative recombination defects in inorganic perovskite.展开更多
Developing high-efficiency and stable inverted CsPbI2Br perovskite solar cells is vitally urgent for their unique advantages of removing adverse dopants and compatible process with tandem cells in comparison with the ...Developing high-efficiency and stable inverted CsPbI2Br perovskite solar cells is vitally urgent for their unique advantages of removing adverse dopants and compatible process with tandem cells in comparison with the regular.However,relatively low opening circuit voltage(Voc)and limited moisture stability have lagged their progress far from the regular.Here,we propose an effective surface treatment strategy with high-temperature FABr treatment to address these issues.The induced ions exchange can not only adjust energy level,but also gift effective passivation.Meanwhile,the gradient distribution of FA+can accelerate the carriers transport to further suppress bulk recombination.Besides,the Br-rich surface and FA+substitution can isolate moisture erosions.As a result,the optimized devices show champion efficiency of 15.92%with Voc of 1.223 V.In addition,the tolerance of humidity and operation get significant promotion:maintaining 91.7%efficiency after aged at RH 20%ambient condition for 1300 h and 81.8%via maximum power point tracking at 45°C for 500 h in N2.Furthermore,the unpackaged devices realize the rare reported air operational stability and,respectively,remain almost efficiency(98.9%)after operated under RH 35%for 600 min and 91.2%under RH 50%for 300 min.展开更多
The photovoltaic performance of perovskite sloar cells(PSCs)is strongly dependent on the crystallinity,morphorlogy and defects of perovskite films.In the present work,a novel strategy was developed to fabricate the hi...The photovoltaic performance of perovskite sloar cells(PSCs)is strongly dependent on the crystallinity,morphorlogy and defects of perovskite films.In the present work,a novel strategy was developed to fabricate the high quality CsPbI3 inorganic perovskite by tuning the growth dynamics of CsPbI3 by pretreatment of fresh CsPbI3 films with phenylethylamine iodide(PEAI).The PEAI can mediate the phase transformation from 1D(DMAPbI3)(DMA:dimethylammonium)to 3D CsPbI3 all-inorganic perovskite films via the PEA2CsPb2I7 of 2D perovskite intermediate phase,resulting in highly crystalline CsPbI3 perovskite films with remarkably enlarged grains and reduced defects.The as-achieved highly crystalline CsPbI3 inorganic perovskite not only exhibited improved phase stability but also significant reduced defects.The perovskite solar cells based on these CsPbI3 thin films exhibited a champion efficiency of 17.08%,much higher than those prepared through posttreatment or direct addition of PEAI into CsPbI3 precursor solution.This work not only developed an effective strategy to prepare high crystalline CsPbI3 film and highly efficient CsPbI3-based all-inorganic PSCs,but also unraveled the mediation mechanism of CsPbI3by pre-treatment of PEAI,shedding light for further development of high perfomance perovskite-based optoelectronics.展开更多
The organic–inorganic hybrid perovskite solar cells(PSCs)have demonstrated their unprecedented high efficiency and potential for commercialization.The volatile organic components in the hybrid perovskite crystal stru...The organic–inorganic hybrid perovskite solar cells(PSCs)have demonstrated their unprecedented high efficiency and potential for commercialization.The volatile organic components in the hybrid perovskite crystal structure are still a big challenge for long-term stabilities.Recently,inorganic CsPbI3 perovskite has attracted much attention because of its superior chemical stability over the prevailing hybrid organic–inorganic perovskite and the most suitable band gap among all-inorganic perovskites.Nevertheless,CsPbI3 suffers from phase instability and low photovoltaic(PV)performance due to its undesirable tolerant factor.Much research effort has been devoted into stabilization of CsPbI3.In this perspective,we review the recent progress on chemical engineering processes for the stabilization of inorganic CsPbI3 perovskite for high-efficiency PVs.We also discuss the importance of understanding mechanism behind stabilization of CsPbI3 perovskite film and the development of inorganic CsPbI3-based highly efficient and stable PSCs.展开更多
Nowadays,inorganic CsPbI3 perovskite solar cells(PSCs)have become one of the most attractive research hotspots in photovoltaic field for its superior chemical stability and excellent photo-electronic properties.Since ...Nowadays,inorganic CsPbI3 perovskite solar cells(PSCs)have become one of the most attractive research hotspots in photovoltaic field for its superior chemical stability and excellent photo-electronic properties.Since the first independent report in 2015,the power conversion efficiency(PCE)of CsPbI3 based PSCs has sharply increased from 3.9%to 19.03%.Importantly,during the developing process of CsPbI3 PSCs,HI hydrolysis-derived intermediate plays an important role:from stabilizing the crystal structure,optimizing the fabricated film to boosting the device performance.In this review,the different crystal and electronic structures of CsPbI3 are introduced.We then trace the history and disputes of HI hydrolysis-derived intermediate to make this review more logical.Meanwhile,we highlight the functions of HI hydrolysis-derived intermediate,and systematically summarize the advanced works on CsPbI3 PSCs.Finally,the bottlenecks and prospects are revealed to further increase the CsPbI3 PSCs performance.展开更多
Although all-inorganic perovskites possess suitable bandgap and thermal stability for photovoltaic ap-plications,the unstable film morphologies,and poor moisture stabilities lag behind the organic-inorganic hybrid cou...Although all-inorganic perovskites possess suitable bandgap and thermal stability for photovoltaic ap-plications,the unstable film morphologies,and poor moisture stabilities lag behind the organic-inorganic hybrid counterparts.Herein,we demonstrate that high qualityα-CsPbI_(2 ) Br films with improved phase sta-bility,high crystallinity,and pinhole-free film morphology was achieved by employing tetramethylammo-nium chloride(TMACl)as an additive.As a result,the TMACl-added CsPbI_(2) Br films exhibited high power conversion efficiency of 14.12%with an open-circuit voltage of 1.19 V,a short-circuit current density of 15.08 mA/cm^(2),and a fill factor of 0.78.More importantly,the TMACl addition imparts hydrophobicity to the film surface of CsPbI_(2) Br,which delivered excellent stability up to 30 days in the ambient condition and thermal stability at 85℃ for 156 h,respectively.Moreover,the TMACl-added device also exhibited excellent PCE of 27.16%under indoor light source(1000 lux),which presents a promising approach for designing stable but high performance all-inorganic perovskite solar cells.展开更多
All-inorganic cesium lead iodide(CsPbI_(3))perovskites with superior thermal stability are attractive candidates for perovskite solar cells(PSCs).Fabricating such inorganic PSCs in the ambient atmosphere is desirable ...All-inorganic cesium lead iodide(CsPbI_(3))perovskites with superior thermal stability are attractive candidates for perovskite solar cells(PSCs).Fabricating such inorganic PSCs in the ambient atmosphere is desirable for practical production,however,the challenge remains in inhibiting the phase transition of CsPbI_(3) in ambient air.Herein,we demonstrate a dual bulk and interface engineering using ionic liquid to stabilize CsPbI_(3) perovskite structure,thus enhancing the performance of ambient-processed inverted CsPbI_(3) PSCs.Such dual bulk and interface engineering is found effective not only in suppressing the bulk and interfacial charge carrier recombination and enhancing charge carrier transport and extraction,but also in protecting CsPbI_(3) crystal structure by leaving hydrophobic alkyl chains coverage at the boundary and surface to prevent phase transition caused by moisture from ambient air.The optimized device fully processed in the open air with relative humidity up to 55%exhibits remarkably enhanced efficiency and stability over the control device,with the efficiency increasing from 8.6%to 13.21%,and 92%efficiency maintaining after storage for 1680 h,which outperforms the control device with only 82%retaining after 648 h storage.We thus believe this work can provide an efficient alternative for the low-cost fabrication of ambient-processible PSCs.展开更多
中国科学院深圳先进技术研究院光子信息与能源材料研究中心杨春雷研究员及其团队参与的研究在立方相CsPbI3量子点方面取得进展。相关成果为'Zhou W, Sui F, Zhong GH, et al. Lattice dynamics and thermal stability of cubic-phas...中国科学院深圳先进技术研究院光子信息与能源材料研究中心杨春雷研究员及其团队参与的研究在立方相CsPbI3量子点方面取得进展。相关成果为'Zhou W, Sui F, Zhong GH, et al. Lattice dynamics and thermal stability of cubic-phase CsPbI3 quantum dots(J)The Journal of Physical Chemistry Letters,2018,9(17):4915-4920(立方相CsPbI3量子点的晶格动力学和热稳定性的研究)'。展开更多
Organic-inorganic perovskite (ABX3) solar cells (PSCs) have attracted wide interest in recent years (1)The power conversion efficiency (PCE) has increased up to 23.7%(NREL Best Research-Cell Efficiency Chart, https://...Organic-inorganic perovskite (ABX3) solar cells (PSCs) have attracted wide interest in recent years (1)The power conversion efficiency (PCE) has increased up to 23.7%(NREL Best Research-Cell Efficiency Chart, https://www.nrel.gov/pv/cell-efficiency.html.展开更多
In recent years,all-inorganic perovskite materials have set off a research boom owing to features,such as good thermal stability,suitable bandgap,and fascinating optical properties.However,the power conversion efficie...In recent years,all-inorganic perovskite materials have set off a research boom owing to features,such as good thermal stability,suitable bandgap,and fascinating optical properties.However,the power conversion efficiency(PCE)and the ambient stability of all-inorganic perovskite solar cells still remain a challenge.Herein,we investigate the effect of the addition of InI3 into CsPbI3 film on the corresponding device.InI3 incorporation could retard the crystallization process and control the growth rate of CsPbI3 polycrystalline films,yielding a high quality film with large grains and few voids.The increment in electrostatic potential and the reduction of carrier recombination enabled the open-circuit voltage of fabricated perovskite solar cell to be increased from 0.89 to 0.99 V.The champion device delivered a power conversion efficiency of 17.09%,which is higher than 14.36%for the reference device.And the InI3-included solar cell without any encapsulation retained 77%of its original efficiency after 860 h aging at room temperature in N2 condition.展开更多
Defect passivation is an important strategy to achieve perovskite solar cells(PVSCs) with enhanced power conversion efficiencies(PCEs) and improved stability because the trap states induced by defects in the interface...Defect passivation is an important strategy to achieve perovskite solar cells(PVSCs) with enhanced power conversion efficiencies(PCEs) and improved stability because the trap states induced by defects in the interfaces and grain boundaries of perovskites are harmful to both large open circuit voltage and high photocurrent of devices. Here, zinc cations(Zn^2+) were used as a dopant to passivate defects of the CsPbI2Br perovskite leading to Zn^2+-doped CsPbI2Br film with fewer trap states, improved charge transportation, and enhanced light-harvesting ability. Thus, the best-performance PVSC based on CsPbI2 Br with the optimal Zn^2+doping shows a higher PCE of 12.16% with a larger open-circuit voltage(VOC) of 1.236 V, an improved shortcircuit current(JSC) of 15.61 mA cm^-2 in comparison with the control device based on the pure CsPbI2Br which exhibits a PCE of 10.21% with a VOCof 1.123 V, a JSCof 13.27 mA cm^-2. Time-resolved photoluminescence results show that the Zn^2+doping leads to perovskite film with extended photoluminescence lifetime which means a longer diffusion length and subsequently enhanced photocurrent and open circuit voltage. This work provides a simple strategy to boost the performance of PVSCs through Zn^2+doping.展开更多
Nowadays,due to uncontrolled synthesis and lack of more direct and systematic evidences,the photoluminescence origin of“zero-dimensional”Cs4PbI6 remains great controversy and the luminescence cannot be controlled.He...Nowadays,due to uncontrolled synthesis and lack of more direct and systematic evidences,the photoluminescence origin of“zero-dimensional”Cs4PbI6 remains great controversy and the luminescence cannot be controlled.Here we propose a controllable dissolution-recrystallization method to synthesize“emissive”and“non-emissive”Cs4PbI6 nanocrystals(NCs)respectively.Through comparing“emissive”and“non-emissive”Cs4PbI6 NCs,it is clearly proved that the visible emission in“emissive”Cs4PbI6 NCs comes from embedded CsPbI3 quantum dots(QDs).It is found for CsPbI3@Cs4PbI6 nanocomposites,methyl acetate(MeAC)and cyclohexane play an important role in dissolution and recrystallization respectively to obtain Cs4PbI6 matrix and CsPbI3 cores.Benefiting from this two-step method,the as-synthesized CsPbI3@Cs4PbI6 nanocomposites with CsPbI3 QDs uniformly distributed in Cs4PbI6 matrix are bright with photoluminescence quantum yield(PLQY)up to 71.4%and exhibit improved stability than CsPbI3 NCs.Moreover,utilizing its formation mechanism,the size of embedded CsPbI3 QDs can be controlled by reasonable designing the“dissolution”process,so that the luminescence of this CsPbI3@Cs4PbI6 nanocomposites can be adjusted in a wide range from green to red(554–630 nm).Our finding not only provides a novel method for synthesizing tunable“emissive”Cs4PbI6 NCs,but also makes clear the photoluminescence origin of“emissive”Cs4PbI6.展开更多
文摘全无机钙钛矿量子点CsPbI_(3)拥有出色的光学性能,适用于红光的发光器件及太阳能电池领域。同时,组分原子半径相差较大,且软晶格导致卤素离子迁移,会导致CsPbI_(3)量子点发生相变,即失效。利用铅基金属有机框架(Pb metal organic framework,Pb-MOF)作为钙钛矿中的铅源,合成CsPbI_(3)量子点(CsPbI_(3)@Pb-MOF-OLAMI)。结果表明,其热稳定性提升了40%,而光照稳定性在经过碘化铅(PbI_(2))离子源溶液的修复后,提升了15倍。这种稳定性的改善主要源于孔洞限制效应,即Pb-MOF的多孔结构阻碍或减缓卤素离子的迁移,避免或减少缺陷的形成,也就抑制了钙钛矿变性过程。该研究为改善钙钛矿量子点CsPbI_(3)的稳定性提供了新思路。
基金financially supported by the National Natural Science Foundation of China(Nos.51672094,51861145404 and 51822203)the China Postdoctoral Science Foundation(No.2016M602286)+2 种基金the Self-determined and Innovative Research Funds of HUST(No.2016JCTD111)Shenzhen Science and Technology Innovation Committee(No.JCYJ20170307165905513)the Natural Science Foundation of Guangdong Province(No.2017A030313342).
文摘Inorganic cesium metal halide perovskites have gained research interest as absorbers in perovskite solar cells due to their superior thermal stability.Among these,CsPbI2Br,with a narrower band gap than CsPbBr3 and a better phase stability than CsPbI3,has received tremendous interest of the researchers.However,CsPbI2 Br takes adverse phase transfer easily with an exposure to the water vapor in ambient air which not only brings inconvenience for researches but also puts forward very high requirement for encapsulation.Herein,a dense and uniform film is obtained by incorporating hydrophobic CH3NH3Cl(MACl)into the precursor solution.Being attributed to a good passivation effect,the defect density is decreased from3.12×1016 to 1.49×1016 cm-3 and the average photoluminescence lifetime is increased from 8.84 to 20.6 ns.The photovoltaic device achieves a high open-circuit voltage of 1.22 V based on optimized MACl-doped film and accordingly a higher power conversion efficiency(PCE) of 12.9% which is 21.7% higher than the pristine CsPbI2Br device with PCE of 10.6%.In addition,the ambient stability of MACl-doped device has been enhanced,which is greatly attributed to the hydrophobic properties of MACl.This work provides a clue to improve ambient stability of inorganic perovskite solar cells and inspires toward further development of this material.
基金financially supported by the National Natural Science Foundation of China(Nos.61604119,61704131,and 61804111)Initiative Postdocs Supporting Program(No.BX20180234)+2 种基金China Postdoctoral Science Foundation(No.2018M643578)Young Elite Scientists Sponsorship Program by CAST(2016QNRC001)Fundamental Research Funds for the Central Universities.
文摘Interface engineering has been regarded as an effective and noninvasive means to optimize the performance of perovskite solar cells(PSCs).Here,doping engineering of a ZnO electron transport layer(ETL)and CsPbI3/ZnO interface engineering via introduction of an interfacial layer are employed to improve the performances of CsPbI3-based PSCs.The results show that when introducing a TiO2 buffer layer while increasing the ZnO layer doping concentration,the open-circuit voltage,power conversion efficiency,and fill factor of the CsPbI3-based PSCs can be improved to 1.31 V,21.06%,and 74.07%,respectively,which are superior to those of PSCs only modified by the TiO2 buffer layer or high-concentration doping of ZnO layer.On the one hand,the buffer layer relieves the band bending and structural disorder of CsPbI3.On the other hand,the increased doping concentration of the ZnO layer improves the conductivity of the TiO2/ZnO bilayer ETL because of the strong interaction between the TiO2 and ZnO layers.However,such phenomena are not observed for those of a PCBM/ZnO bilayer ETL because of the weak interlayer interaction of the PCBM/ZnO interface.These results provide a comprehensive understanding of the CsPbI3/ZnO interface and suggest a guideline to design high-performance PSCs.
基金supported by the National Key R&D Program of China(2016YFB0303602)Sichuan and Technology Program(Grant No.2018JY0015)Yong Science and Technology Innovation Team Project of SWPU(No.2019CXTD04)。
文摘All-inorganic halide perovskite solar cells(PSCs)have acquired great progress,especially CsPbI2Br.However,their photoelectric conversion efficiency(PCE)remains far below the theoretical predictions.Non-radiative recombination is one of the important issues affecting the photoelectric performance of the PSCs,and the defective lead ions derived from the evaporation of halide ions in the inorganic perovskite are the principal non-radiative recombination centers.Herein,the non-radiative recombination is effectively suppressed by introducing the N-methyl-2-pyrrolidone(NMP)as a Lewis base molecule to passivate the defective lead ions.Therefore,by adjusting the dosage of NMP,the smooth and pinhole-free CsPbI_(2)Br perovskite film is obtained and the optimized device exhibits a champion PCE of 16.77%with an excellent fill factor(FF)of 0.80.This work proves the effectiveness of passivation using Lewis base molecules to prevent non-radiative recombination defects in inorganic perovskite.
基金The authors thank the financial supports by the National Natural Science Foundation of China(61974150 and 51773213)the Zhejiang Provincial Natural Science Foundation of China(LQ19E030008)+1 种基金the Key Research Program of Frontier Sciences,CAS(QYZDB-SSW-JSC047),the Zhejiang Province Science and Technology Plan(2018C01047)the Fundamental Research Funds for the Central Universities and the National Youth Top-notch Talent Support Program.
文摘Developing high-efficiency and stable inverted CsPbI2Br perovskite solar cells is vitally urgent for their unique advantages of removing adverse dopants and compatible process with tandem cells in comparison with the regular.However,relatively low opening circuit voltage(Voc)and limited moisture stability have lagged their progress far from the regular.Here,we propose an effective surface treatment strategy with high-temperature FABr treatment to address these issues.The induced ions exchange can not only adjust energy level,but also gift effective passivation.Meanwhile,the gradient distribution of FA+can accelerate the carriers transport to further suppress bulk recombination.Besides,the Br-rich surface and FA+substitution can isolate moisture erosions.As a result,the optimized devices show champion efficiency of 15.92%with Voc of 1.223 V.In addition,the tolerance of humidity and operation get significant promotion:maintaining 91.7%efficiency after aged at RH 20%ambient condition for 1300 h and 81.8%via maximum power point tracking at 45°C for 500 h in N2.Furthermore,the unpackaged devices realize the rare reported air operational stability and,respectively,remain almost efficiency(98.9%)after operated under RH 35%for 600 min and 91.2%under RH 50%for 300 min.
基金supported by the National Natural Science Foundation of China(No.51602106)。
文摘The photovoltaic performance of perovskite sloar cells(PSCs)is strongly dependent on the crystallinity,morphorlogy and defects of perovskite films.In the present work,a novel strategy was developed to fabricate the high quality CsPbI3 inorganic perovskite by tuning the growth dynamics of CsPbI3 by pretreatment of fresh CsPbI3 films with phenylethylamine iodide(PEAI).The PEAI can mediate the phase transformation from 1D(DMAPbI3)(DMA:dimethylammonium)to 3D CsPbI3 all-inorganic perovskite films via the PEA2CsPb2I7 of 2D perovskite intermediate phase,resulting in highly crystalline CsPbI3 perovskite films with remarkably enlarged grains and reduced defects.The as-achieved highly crystalline CsPbI3 inorganic perovskite not only exhibited improved phase stability but also significant reduced defects.The perovskite solar cells based on these CsPbI3 thin films exhibited a champion efficiency of 17.08%,much higher than those prepared through posttreatment or direct addition of PEAI into CsPbI3 precursor solution.This work not only developed an effective strategy to prepare high crystalline CsPbI3 film and highly efficient CsPbI3-based all-inorganic PSCs,but also unraveled the mediation mechanism of CsPbI3by pre-treatment of PEAI,shedding light for further development of high perfomance perovskite-based optoelectronics.
基金supported by the NSFC(Grant 51861145101,21777096)Huoyingdong Grant(151046)+1 种基金Shanghai Shuguang Grant(17SG11)the China Postdoctoral Science Foundation(2017M621466)
文摘The organic–inorganic hybrid perovskite solar cells(PSCs)have demonstrated their unprecedented high efficiency and potential for commercialization.The volatile organic components in the hybrid perovskite crystal structure are still a big challenge for long-term stabilities.Recently,inorganic CsPbI3 perovskite has attracted much attention because of its superior chemical stability over the prevailing hybrid organic–inorganic perovskite and the most suitable band gap among all-inorganic perovskites.Nevertheless,CsPbI3 suffers from phase instability and low photovoltaic(PV)performance due to its undesirable tolerant factor.Much research effort has been devoted into stabilization of CsPbI3.In this perspective,we review the recent progress on chemical engineering processes for the stabilization of inorganic CsPbI3 perovskite for high-efficiency PVs.We also discuss the importance of understanding mechanism behind stabilization of CsPbI3 perovskite film and the development of inorganic CsPbI3-based highly efficient and stable PSCs.
基金funded by the National Natural Science Foundation of China(51902148,61704099 and 51801088)the Fundamental Research Funds for the Central Universities(lzujbky-2020-61,lzujbky-2019-88 and lzujbky-2020-kb06)the Special Funding for Open and Shared Large-Scale Instruments and Equipments of Lanzhou University(LZU-GXJJ2019C023 and LZU-GXJJ-2019C019).
文摘Nowadays,inorganic CsPbI3 perovskite solar cells(PSCs)have become one of the most attractive research hotspots in photovoltaic field for its superior chemical stability and excellent photo-electronic properties.Since the first independent report in 2015,the power conversion efficiency(PCE)of CsPbI3 based PSCs has sharply increased from 3.9%to 19.03%.Importantly,during the developing process of CsPbI3 PSCs,HI hydrolysis-derived intermediate plays an important role:from stabilizing the crystal structure,optimizing the fabricated film to boosting the device performance.In this review,the different crystal and electronic structures of CsPbI3 are introduced.We then trace the history and disputes of HI hydrolysis-derived intermediate to make this review more logical.Meanwhile,we highlight the functions of HI hydrolysis-derived intermediate,and systematically summarize the advanced works on CsPbI3 PSCs.Finally,the bottlenecks and prospects are revealed to further increase the CsPbI3 PSCs performance.
基金supported by the Korea Electric Power Corporation (No. R20XO02-13)supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (No. 2020R1A6A1A03048004)。
文摘Although all-inorganic perovskites possess suitable bandgap and thermal stability for photovoltaic ap-plications,the unstable film morphologies,and poor moisture stabilities lag behind the organic-inorganic hybrid counterparts.Herein,we demonstrate that high qualityα-CsPbI_(2 ) Br films with improved phase sta-bility,high crystallinity,and pinhole-free film morphology was achieved by employing tetramethylammo-nium chloride(TMACl)as an additive.As a result,the TMACl-added CsPbI_(2) Br films exhibited high power conversion efficiency of 14.12%with an open-circuit voltage of 1.19 V,a short-circuit current density of 15.08 mA/cm^(2),and a fill factor of 0.78.More importantly,the TMACl addition imparts hydrophobicity to the film surface of CsPbI_(2) Br,which delivered excellent stability up to 30 days in the ambient condition and thermal stability at 85℃ for 156 h,respectively.Moreover,the TMACl-added device also exhibited excellent PCE of 27.16%under indoor light source(1000 lux),which presents a promising approach for designing stable but high performance all-inorganic perovskite solar cells.
基金financially supported by the Basic Research Programs of Taicang 2021 (No. TC2021JC22)the Guangdong Basic and Applied Basic Research Foundation (No. 2020A1515110727)+2 种基金the National Natural Science Foundation of China (No. 52002327, 62004169 and 51972272)the Fundamental Research Funds for the Central Universitiesthe Research Fund of the State Key Laboratory of Solidification Processing (NPU), China (No. 2019-QZ-03)
文摘All-inorganic cesium lead iodide(CsPbI_(3))perovskites with superior thermal stability are attractive candidates for perovskite solar cells(PSCs).Fabricating such inorganic PSCs in the ambient atmosphere is desirable for practical production,however,the challenge remains in inhibiting the phase transition of CsPbI_(3) in ambient air.Herein,we demonstrate a dual bulk and interface engineering using ionic liquid to stabilize CsPbI_(3) perovskite structure,thus enhancing the performance of ambient-processed inverted CsPbI_(3) PSCs.Such dual bulk and interface engineering is found effective not only in suppressing the bulk and interfacial charge carrier recombination and enhancing charge carrier transport and extraction,but also in protecting CsPbI_(3) crystal structure by leaving hydrophobic alkyl chains coverage at the boundary and surface to prevent phase transition caused by moisture from ambient air.The optimized device fully processed in the open air with relative humidity up to 55%exhibits remarkably enhanced efficiency and stability over the control device,with the efficiency increasing from 8.6%to 13.21%,and 92%efficiency maintaining after storage for 1680 h,which outperforms the control device with only 82%retaining after 648 h storage.We thus believe this work can provide an efficient alternative for the low-cost fabrication of ambient-processible PSCs.
文摘中国科学院深圳先进技术研究院光子信息与能源材料研究中心杨春雷研究员及其团队参与的研究在立方相CsPbI3量子点方面取得进展。相关成果为'Zhou W, Sui F, Zhong GH, et al. Lattice dynamics and thermal stability of cubic-phase CsPbI3 quantum dots(J)The Journal of Physical Chemistry Letters,2018,9(17):4915-4920(立方相CsPbI3量子点的晶格动力学和热稳定性的研究)'。
基金the National Key Research and Development Program of China (2017YFA0206600)the National Natural Science Foundation of China (51773045, 21572041 and 21772030) for financial support
文摘Organic-inorganic perovskite (ABX3) solar cells (PSCs) have attracted wide interest in recent years (1)The power conversion efficiency (PCE) has increased up to 23.7%(NREL Best Research-Cell Efficiency Chart, https://www.nrel.gov/pv/cell-efficiency.html.
基金This work was supported by the National Key R&D Program of China(No.2016YFA0202402)the National Natural Science Foundation of China(Nos.61674109 and 91733301)+4 种基金the Natural Science Foundation of Jiangsu Province(No.BK20170059)the Chinese Postdoctoral Science Foundation(No.2015M580460)the Open Fund of the State Key Laboratory of Integrated Optoelectronics(No.IOSKL2018KF07)the Collaborative Innovation Centre of Suzhou Nano Science and Technology,the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)the“111”Project of the State Administration of Foreign Experts Affairs of China.
文摘In recent years,all-inorganic perovskite materials have set off a research boom owing to features,such as good thermal stability,suitable bandgap,and fascinating optical properties.However,the power conversion efficiency(PCE)and the ambient stability of all-inorganic perovskite solar cells still remain a challenge.Herein,we investigate the effect of the addition of InI3 into CsPbI3 film on the corresponding device.InI3 incorporation could retard the crystallization process and control the growth rate of CsPbI3 polycrystalline films,yielding a high quality film with large grains and few voids.The increment in electrostatic potential and the reduction of carrier recombination enabled the open-circuit voltage of fabricated perovskite solar cell to be increased from 0.89 to 0.99 V.The champion device delivered a power conversion efficiency of 17.09%,which is higher than 14.36%for the reference device.And the InI3-included solar cell without any encapsulation retained 77%of its original efficiency after 860 h aging at room temperature in N2 condition.
基金supported by the National Natural Science Foundation of China (U1605241)the Key Research Program of Frontier Sciences, CAS (QYZDB-SSW-SLH032)the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB20030300)
文摘Defect passivation is an important strategy to achieve perovskite solar cells(PVSCs) with enhanced power conversion efficiencies(PCEs) and improved stability because the trap states induced by defects in the interfaces and grain boundaries of perovskites are harmful to both large open circuit voltage and high photocurrent of devices. Here, zinc cations(Zn^2+) were used as a dopant to passivate defects of the CsPbI2Br perovskite leading to Zn^2+-doped CsPbI2Br film with fewer trap states, improved charge transportation, and enhanced light-harvesting ability. Thus, the best-performance PVSC based on CsPbI2 Br with the optimal Zn^2+doping shows a higher PCE of 12.16% with a larger open-circuit voltage(VOC) of 1.236 V, an improved shortcircuit current(JSC) of 15.61 mA cm^-2 in comparison with the control device based on the pure CsPbI2Br which exhibits a PCE of 10.21% with a VOCof 1.123 V, a JSCof 13.27 mA cm^-2. Time-resolved photoluminescence results show that the Zn^2+doping leads to perovskite film with extended photoluminescence lifetime which means a longer diffusion length and subsequently enhanced photocurrent and open circuit voltage. This work provides a simple strategy to boost the performance of PVSCs through Zn^2+doping.
基金This work was financially supported by the Joint Funds of the National Natural Science Foundation of China and Yunnan Province(No.U1902222)the National Natural Science Foundation of China(Nos.51961145101 and 52102195)+3 种基金China Postdoctoral Science Foundation(Nos.2020M672960 and 2021M703656)Guangzhou Science&Technology Project(No.202007020005)Hunan High Level Talent Gathering Project(Nos.2019RS1077 and 2020RC5007)the Guangdong Provincial Key Laboratory of Semiconductor Micro Display(No.2020B121202003)。
文摘Nowadays,due to uncontrolled synthesis and lack of more direct and systematic evidences,the photoluminescence origin of“zero-dimensional”Cs4PbI6 remains great controversy and the luminescence cannot be controlled.Here we propose a controllable dissolution-recrystallization method to synthesize“emissive”and“non-emissive”Cs4PbI6 nanocrystals(NCs)respectively.Through comparing“emissive”and“non-emissive”Cs4PbI6 NCs,it is clearly proved that the visible emission in“emissive”Cs4PbI6 NCs comes from embedded CsPbI3 quantum dots(QDs).It is found for CsPbI3@Cs4PbI6 nanocomposites,methyl acetate(MeAC)and cyclohexane play an important role in dissolution and recrystallization respectively to obtain Cs4PbI6 matrix and CsPbI3 cores.Benefiting from this two-step method,the as-synthesized CsPbI3@Cs4PbI6 nanocomposites with CsPbI3 QDs uniformly distributed in Cs4PbI6 matrix are bright with photoluminescence quantum yield(PLQY)up to 71.4%and exhibit improved stability than CsPbI3 NCs.Moreover,utilizing its formation mechanism,the size of embedded CsPbI3 QDs can be controlled by reasonable designing the“dissolution”process,so that the luminescence of this CsPbI3@Cs4PbI6 nanocomposites can be adjusted in a wide range from green to red(554–630 nm).Our finding not only provides a novel method for synthesizing tunable“emissive”Cs4PbI6 NCs,but also makes clear the photoluminescence origin of“emissive”Cs4PbI6.
