In inverted perovskite solar cells (PSCs),effective modification of the interface between the metalcathode and electron transport layer (ETL) is crucial forachieving high performance and stability. Herein, sulfonatedb...In inverted perovskite solar cells (PSCs),effective modification of the interface between the metalcathode and electron transport layer (ETL) is crucial forachieving high performance and stability. Herein, sulfonatedbathocuproine, commonly known as disodium bathocuproinedisulfonate (BCDS), was employed as a cathode buffer layerto address the interfacial issues at the [6,6]-phenyl-C61-butyricacid methyl ester (PCBM)/Ag interface. BCDS possesses theability to form coordinate bonds with Ag electrodes. Theutilization of the BCDS buffer layer enhanced the chargeextraction capability at the cathode interface whilesimultaneously achieving interfacial defect passivation,improving interfacial contact and increasing the built-in electricfield. Consequently, a power conversion efficiency (PCE) of25.06% was achieved. Furthermore, owing to the excellent filmforminguniformity of BCDS on PCBM, the stability of thedevice was also improved. After storage in dry air for morethan 2000 h, the device maintained 96% of its initial efficiency. This work underscores the remarkable potential of tailoringcoordination groups to enhance charge extraction efficiency at the ETL-cathode interface, unveiling a promising newfrontier in buffer layer development and performance optimization strategies for PSCs.展开更多
全钙钛矿叠层太阳能电池(all perovskite tandem solar cell,AP-TSC)拥有巨大的潜力可突破单结Shockley-Queisser限制,但高质量空穴传输层(hole transport layer,HTL)和电子传输层(electron transport layer,ETL)的缺失阻碍了叠层电池...全钙钛矿叠层太阳能电池(all perovskite tandem solar cell,AP-TSC)拥有巨大的潜力可突破单结Shockley-Queisser限制,但高质量空穴传输层(hole transport layer,HTL)和电子传输层(electron transport layer,ETL)的缺失阻碍了叠层电池的发展.本文利用TCAD Atlas软件对AP-TSC的四种载流子传输层进行优化设计,即顶部HTL、顶部ETL、底部HTL和底部ETL.结果表明,在聚(3,4-乙烯二氧噻吩)-聚苯乙烯磺酸(poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate),PEDOT:PSS)、2,2',7,7'-四[N,N-二(4-甲氧基苯基)氨基]-9,9'-螺二芴(2,2',7,7'-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene,Spiro-OMETAD)、CuI、CuO、NiO和CuSCN中,NiO是最适合的顶部HTL和底部HTL材料.在C_(60)、SnO_(2)、TiO_(2)、ZnO、[6,6]-苯基-C61-丁酸异甲酯((6,6)-phenyl-C61 butyrie acid methyl ester,PCBM)和CdS中,SnO_(2)和ZnO分别是最合适的顶部ETL和底部ETL材料.此外,钙钛矿厚度对电池效率的影响研究得出,无电流限制下FA_(0.8)Cs_(0.2)Pb(I_(0.7)Br_(0.3))_(3)和MAPb_(0.5)Sn_(0.5)I_(3)的厚度拟合方程为y=0.75x?35.通过材料设计和钙钛矿厚度优化,在异质结界面复合速率为1000 cm/s时,AP-TSC依然实现了32%的效率.展开更多
The open-air fabrication of quantum-dot light-emitting diodes(QLEDs)shows great potential for scalable manufacturing.However,the processing stability of QLED devices remains a fundamental barrier to their industrializ...The open-air fabrication of quantum-dot light-emitting diodes(QLEDs)shows great potential for scalable manufacturing.However,the processing stability of QLED devices remains a fundamental barrier to their industrialization.This study investigates the gas-related stability of QLEDs based on the ZnMgO electron transport layer(ETL).By analyzing the current density–voltage(J–V)characteristics of QLEDs and the corresponding sub-devices of functional layers in different gas environments,we demonstrate that the ZnMgO ETL plays a critical role in determining the gas-related stability of QLEDs.Further characterizations and density functional theory(DFT)calculations indicate that gas-induced surface reactions—particularly modifications to surface states and the formation of stable ZnMgO/OH—are the primary causes of performance degradation of QLEDs.展开更多
Perovskite solar cells have attracted much interest due to the very fast increase of power conversion efficiency(PCE)as well as the lowcost solution processing,excellent absorption coefficient,and long charge carrier ...Perovskite solar cells have attracted much interest due to the very fast increase of power conversion efficiency(PCE)as well as the lowcost solution processing,excellent absorption coefficient,and long charge carrier diffusion length[1-3].In a typical perovskite solar cell,both the electron transport layer(ETL)and the hole transport layer(HTL)are introduced to improve the separation efficiency of the photo-generated carriers in the perovskite light absorber.According to energy band alignment theory,after the perovskite light absorber is contacted to charge transport layers,a new equilibrium of the Fermi level is established between the perovskite and the charge transport layers.展开更多
SnO_(2) electron transport layer(ETL)has been spotlighted with its excellent electron extraction and stability over TiO_(2) ETL for perovskite solar cells(PSCs),rapidly approaching the highest power conversion efficie...SnO_(2) electron transport layer(ETL)has been spotlighted with its excellent electron extraction and stability over TiO_(2) ETL for perovskite solar cells(PSCs),rapidly approaching the highest power conversion efficiency.Thus,how to boost the performance of ETL is of utmost importance and of urgent need in developing more efficient PSCs.展开更多
Perovskite Solar Cells(PSCs)have attracted considerable attention because of their unique features and high efficiency.However,the stability of perovskite solar cells remains to be improved.In this study,we modified t...Perovskite Solar Cells(PSCs)have attracted considerable attention because of their unique features and high efficiency.However,the stability of perovskite solar cells remains to be improved.In this study,we modified the TiO_(2)Electron Transport Layer(ETL)interface with PbCl_(2).The efficiency of the perovskite solar cells with carbon electrodes increased from 11.28%to 13.34%,and their stability obviously improved.The addition of PbCl_(2)had no effect on the morphology,crystal structure,and absorption property of the perovskite absorber layer.However,it affected the band energy level alignment of the solar cells and accelerated the electron extraction and transfer at the interface between the perovskite layer and the ETL,thus enhancing the overall photovoltaic performance.The interfacial modification of ETL with PbCl_(2)is a promising way for the potential commercialization of low-cost carbon electrode-based perovskite solar cells.展开更多
With the support by the National Natural Science Foundation of China,the research team led by Prof.Hou Yu(侯宇)and Prof.Yang Huagui(杨化桂)at the Key Laboratory for Ultrafine Materials of Ministry of Education,School ...With the support by the National Natural Science Foundation of China,the research team led by Prof.Hou Yu(侯宇)and Prof.Yang Huagui(杨化桂)at the Key Laboratory for Ultrafine Materials of Ministry of Education,School of Materials Science and Engineering,East China University of Science展开更多
Tin-based perovskite solar cells(PSCs)are the most promising alternatives to toxic lead-based ones.However,the loss in open-circuit voltage(V_(OC))remains an important issue.Improvement of V_(OC)has been achieved by u...Tin-based perovskite solar cells(PSCs)are the most promising alternatives to toxic lead-based ones.However,the loss in open-circuit voltage(V_(OC))remains an important issue.Improvement of V_(OC)has been achieved by using a fullerene derivative,indene-C_(60)bisadduct(ICBA),as the electron transporting layer(ETL).For further V_(OC)improvement,the V_(OC)improvement mechanisms must be clarified.Herein,we show,at a molecular level,V_(OC)improvement mechanisms by an ICBA ETL in tinbased PSCs.Electron spin resonance spectroscopy reveals that electron diffusion from perovskite to ETL occurs at perovskite/ETL interfaces,producing unfavorable upward band-bending of perovskite.Employing ICBA with a shallower LUMO level suppresses the upward band-bending as well as reduces the energy offset with the conduction band minimum of perovskite.Suppressing this unfavorable upward band-bending reduces interface recombination at perovskite/ETL interfaces and contributes to V_(OC)improvement.These insights support efficient optimization of the chargetransporting layer for additional improvement of V_(OC).展开更多
基金National Natural Science Foundation of China(11405253,U1332205)Youth Innovation Promotion Association CAS and the Research Program of Science and Technology Commission of Shanghai Municipality(14DZ2261200)
基金supported financially by the National Key R&D Program of China(No.2023YFE0111500)the National Natural Science Foundation of China(Nos.62204222,52103237,52321006,T2394480 and T2394484).
文摘In inverted perovskite solar cells (PSCs),effective modification of the interface between the metalcathode and electron transport layer (ETL) is crucial forachieving high performance and stability. Herein, sulfonatedbathocuproine, commonly known as disodium bathocuproinedisulfonate (BCDS), was employed as a cathode buffer layerto address the interfacial issues at the [6,6]-phenyl-C61-butyricacid methyl ester (PCBM)/Ag interface. BCDS possesses theability to form coordinate bonds with Ag electrodes. Theutilization of the BCDS buffer layer enhanced the chargeextraction capability at the cathode interface whilesimultaneously achieving interfacial defect passivation,improving interfacial contact and increasing the built-in electricfield. Consequently, a power conversion efficiency (PCE) of25.06% was achieved. Furthermore, owing to the excellent filmforminguniformity of BCDS on PCBM, the stability of thedevice was also improved. After storage in dry air for morethan 2000 h, the device maintained 96% of its initial efficiency. This work underscores the remarkable potential of tailoringcoordination groups to enhance charge extraction efficiency at the ETL-cathode interface, unveiling a promising newfrontier in buffer layer development and performance optimization strategies for PSCs.
文摘全钙钛矿叠层太阳能电池(all perovskite tandem solar cell,AP-TSC)拥有巨大的潜力可突破单结Shockley-Queisser限制,但高质量空穴传输层(hole transport layer,HTL)和电子传输层(electron transport layer,ETL)的缺失阻碍了叠层电池的发展.本文利用TCAD Atlas软件对AP-TSC的四种载流子传输层进行优化设计,即顶部HTL、顶部ETL、底部HTL和底部ETL.结果表明,在聚(3,4-乙烯二氧噻吩)-聚苯乙烯磺酸(poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate),PEDOT:PSS)、2,2',7,7'-四[N,N-二(4-甲氧基苯基)氨基]-9,9'-螺二芴(2,2',7,7'-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene,Spiro-OMETAD)、CuI、CuO、NiO和CuSCN中,NiO是最适合的顶部HTL和底部HTL材料.在C_(60)、SnO_(2)、TiO_(2)、ZnO、[6,6]-苯基-C61-丁酸异甲酯((6,6)-phenyl-C61 butyrie acid methyl ester,PCBM)和CdS中,SnO_(2)和ZnO分别是最合适的顶部ETL和底部ETL材料.此外,钙钛矿厚度对电池效率的影响研究得出,无电流限制下FA_(0.8)Cs_(0.2)Pb(I_(0.7)Br_(0.3))_(3)和MAPb_(0.5)Sn_(0.5)I_(3)的厚度拟合方程为y=0.75x?35.通过材料设计和钙钛矿厚度优化,在异质结界面复合速率为1000 cm/s时,AP-TSC依然实现了32%的效率.
基金supported by grants from the National Natural Science Foundation of China(Nos.U23A20683 and 62301033)from the Ministry of Science and High Education of Russian Federation(Project No.FSRZ-2023-0006).
文摘The open-air fabrication of quantum-dot light-emitting diodes(QLEDs)shows great potential for scalable manufacturing.However,the processing stability of QLED devices remains a fundamental barrier to their industrialization.This study investigates the gas-related stability of QLEDs based on the ZnMgO electron transport layer(ETL).By analyzing the current density–voltage(J–V)characteristics of QLEDs and the corresponding sub-devices of functional layers in different gas environments,we demonstrate that the ZnMgO ETL plays a critical role in determining the gas-related stability of QLEDs.Further characterizations and density functional theory(DFT)calculations indicate that gas-induced surface reactions—particularly modifications to surface states and the formation of stable ZnMgO/OH—are the primary causes of performance degradation of QLEDs.
基金supported by the National Natural Science Foundation of China(22425202,22279052,22372067,51902121,22372078)the National Key Research and Development Program of China(2021YFF0500501)。
文摘Perovskite solar cells have attracted much interest due to the very fast increase of power conversion efficiency(PCE)as well as the lowcost solution processing,excellent absorption coefficient,and long charge carrier diffusion length[1-3].In a typical perovskite solar cell,both the electron transport layer(ETL)and the hole transport layer(HTL)are introduced to improve the separation efficiency of the photo-generated carriers in the perovskite light absorber.According to energy band alignment theory,after the perovskite light absorber is contacted to charge transport layers,a new equilibrium of the Fermi level is established between the perovskite and the charge transport layers.
基金This work was supported by NRF(National Honor Scientist Program:2010-0020414)K.S.K.acknowledges the support from KISTI(KSC-2018-CHA-0057,KSC-2018-CRE-0077,KSC-2019-CRE-0103,KSC-2019-CRE-0253,KSC-2020-CRE-0049)+2 种基金C.W.M.acknowledges the support from KISTI(KSC-2018-CRE-0071,KSC-2019-CRE-0139,KSC-2019-CRE-0248)J.K.acknowledges the support from KISTI(KSC-2018-CRE-0055,KSC-2019-CRE-0064,KSC-2019-CRE-0244)J.K thanks to Dr.Sung Bum Kang for valuable discussions.
文摘SnO_(2) electron transport layer(ETL)has been spotlighted with its excellent electron extraction and stability over TiO_(2) ETL for perovskite solar cells(PSCs),rapidly approaching the highest power conversion efficiency.Thus,how to boost the performance of ETL is of utmost importance and of urgent need in developing more efficient PSCs.
基金supported by the National Natural Science Foundation of China(Nos.61875186,61975196,and 61674140)Chinese Academy of Sciences(CAS)The World Academy of Sciences(TWAS)(CASTWAS)scholarship。
文摘Perovskite Solar Cells(PSCs)have attracted considerable attention because of their unique features and high efficiency.However,the stability of perovskite solar cells remains to be improved.In this study,we modified the TiO_(2)Electron Transport Layer(ETL)interface with PbCl_(2).The efficiency of the perovskite solar cells with carbon electrodes increased from 11.28%to 13.34%,and their stability obviously improved.The addition of PbCl_(2)had no effect on the morphology,crystal structure,and absorption property of the perovskite absorber layer.However,it affected the band energy level alignment of the solar cells and accelerated the electron extraction and transfer at the interface between the perovskite layer and the ETL,thus enhancing the overall photovoltaic performance.The interfacial modification of ETL with PbCl_(2)is a promising way for the potential commercialization of low-cost carbon electrode-based perovskite solar cells.
文摘With the support by the National Natural Science Foundation of China,the research team led by Prof.Hou Yu(侯宇)and Prof.Yang Huagui(杨化桂)at the Key Laboratory for Ultrafine Materials of Ministry of Education,School of Materials Science and Engineering,East China University of Science
基金supported by Japan Science and Technology Agency,MIRAI(JPMJMI20C5,JPMJMI22C1,and JPMJMI22E2)Japan Science and Technology Agency,SPRING(JPMJSP2124)+3 种基金New Energy and Industrial Technology Development Organization,Green InnovationJapan Society for the Promotion of Science,Grants-in-Aid for Scientific Research(24K01325)University of Tsukuba,Organization for the Promotion of Strategic Research Initiativessupport from Japan Society for the Promotion of Science,KAKENHI(JP20H00387).
文摘Tin-based perovskite solar cells(PSCs)are the most promising alternatives to toxic lead-based ones.However,the loss in open-circuit voltage(V_(OC))remains an important issue.Improvement of V_(OC)has been achieved by using a fullerene derivative,indene-C_(60)bisadduct(ICBA),as the electron transporting layer(ETL).For further V_(OC)improvement,the V_(OC)improvement mechanisms must be clarified.Herein,we show,at a molecular level,V_(OC)improvement mechanisms by an ICBA ETL in tinbased PSCs.Electron spin resonance spectroscopy reveals that electron diffusion from perovskite to ETL occurs at perovskite/ETL interfaces,producing unfavorable upward band-bending of perovskite.Employing ICBA with a shallower LUMO level suppresses the upward band-bending as well as reduces the energy offset with the conduction band minimum of perovskite.Suppressing this unfavorable upward band-bending reduces interface recombination at perovskite/ETL interfaces and contributes to V_(OC)improvement.These insights support efficient optimization of the chargetransporting layer for additional improvement of V_(OC).
