Wide-band gap perovskites combined with silicon(Si)in tandem solar cells offer a cost-effective path to industrialization.However,surface recombination at the buried interface of perovskite solar cells(PSCs)and the ed...Wide-band gap perovskites combined with silicon(Si)in tandem solar cells offer a cost-effective path to industrialization.However,surface recombination at the buried interface of perovskite solar cells(PSCs)and the edge surface of Si solar cells affects their efficiency and stability.Herein,we design a multi-site passivation agent to simultaneously suppress defect recombination in hole transfer layer(HTL)surface,perovskite buried interface,and Si edge for efficient tandem solar cells.The increased ratio of Ni^(3+)/Ni^(2+)reduces the nickel oxide(NiO_(x))/perovskite interface reaction and improves the conductivity of the NiO_(x) HTL.The reconstructed underlayer is more propitious to the perovskite deposition,which releases the residual strain,resulting in the enhancement of the efficiency and stability of PSCs.Moreover,the multi-site passivation agent presents a distinctive passivation effect for edge surface of Si solar cells.Power conversion efficiencies(PCEs)of 21.95% and 20.01% are obtained at opaque and semitransparent PSCs,respectively.Additionally,a four-terminal tandem solar cell exhibits a PCE of 31.02% with+1.19% abs PCE increase for bottom cell by edge surface passivation.Overall,this work provides a simple and multi-site surface defect passivation strategy for obtaining high-efficiency and stable perovskite and perovskite tandem solar cells.展开更多
Photovoltaic/thermoelectric(PV/TE)coupling systems simultaneously cool solar cells and recover waste heat.Single-wall carbon nanotubes(SWCNTs)films are expected to simultaneously exhibit their electrical conductivity,...Photovoltaic/thermoelectric(PV/TE)coupling systems simultaneously cool solar cells and recover waste heat.Single-wall carbon nanotubes(SWCNTs)films are expected to simultaneously exhibit their electrical conductivity,thermal conductivity,and thermoelectric properties in this application.Fabricating SWCNTs films with polymer-dispersed SWCNTs are simple,safe,and scalable.However,the difficulty in simultaneously enhancing both dispersion quality and SWCNT concentration significantly limit the electrical conductivity of these films.Herein,we develop a SWCNT redispersion method in Nafion ethanol system to achieve well-dispersion at high SWCNT concentrations.Using this dispersion,A4-sized films were readily prepared,achieving remarkable electrical conductivity of 1.97 MS/m.The large-area film exhibits a high power factor(654.37μW/(m·K^(2)))and apparent thermal conductivity(529 W/(m·K)),and is integrated into a 330 cm^(2)thermoelectric/photovoltaic coupling system.The PV output power increases by 220 mW.An additional 70 mV thermoelectric voltage is generated.Moreover,the investigation of the drying process unravels how polymer,solvent and SWCNT concentration collectively dominate the film uniformity.This work significantly enhances the electrical conductivity of polymer-dispersed SWCNTs and explores an application direction that simultaneously utilizes their high thermoelectric performance and thermal conductivity,highlighting their great application potential in PV/TE systems.展开更多
Diverse defects in copper indium gallium diselenide solar cells cause nonradiative recombination losses and impair device performance.Here,an organic passivation scheme for surface and grain boundary defects is report...Diverse defects in copper indium gallium diselenide solar cells cause nonradiative recombination losses and impair device performance.Here,an organic passivation scheme for surface and grain boundary defects is reported,which employs an organic passivation agent to infiltrate the copper indium gallium diselenide thin films.A transparent conductive passivating(TCP)film is then developed by incorporating metal nanowires into the organic polymer and used in solar cells.The TCP films have a transmittance of more than 90%in the visible and nearinfrared spectra and a sheet resistance of~10.5Ω/sq.This leads to improvements in the open-circuit voltage and the efficiency of the organic passivated solar cells compared with control cells and paves the way for novel approaches to copper indium gallium diselenide defect passivation and possibly other compound solar cells.展开更多
Lithium cobalt oxide(LCO),the first commercialized cathode active material for lithium-ion batteries,is known for high voltage and capacity.However,its application has been limited by relatively low capacity and stabi...Lithium cobalt oxide(LCO),the first commercialized cathode active material for lithium-ion batteries,is known for high voltage and capacity.However,its application has been limited by relatively low capacity and stability at high C-rates.Reducing particle size is considered one of the most straightforward and effective strategies to enhance ion transfer,thus increasing the rate performance.However,side reactions are simultaneously enhanced as the specific surface area increases.Herein,we investigate the impact of LCO particles with varying size distributions and optimize the particle size.To modulate the side reactions associated with particle size reduction,an ultrathin carbon nanotube film(UCNF)is introduced to coat the cathode surface.With this simple process and optimized particle size,the rate performance improves significantly,normal commercial LCO achieves 118 mA·h·g^(−1)at 3.0–4.3 V and 20 C(0.72 mA·h·cm^(−2)),corresponding to power density of 8732 W·kg^(−1).This method is applied to high voltage as well,152 mA·h·g^(−1)at 3.0–4.6 V and 20 C(0.99 mA·h·cm^(−2))was achieved with high-voltage LCO(HVLCO),corresponding to power density of 11,552 W·kg^(−1).The cycling stability is also enhanced,with the capacity retention maintaining more than 96%after 100 cycles at 0.1 C.For the first time,UCNF is demonstrated to suppress the excessive decomposition of the electrolytes and solvents by blocking electron injection/extraction between LCO and electrolyte solution.Our findings provide a simple method for improving LCO rate performance,especially at high C-rates.展开更多
基金the National Natural Science Foundation of China(62304066,62274054)China and Germany Postdoctoral Exchange Program(ZD2023010),Natural Science Foundation of Hebei Province(F2023201001,F2023201005)+2 种基金Interdisciplinary research project of Hebei University(DXK202303)The Central Guidance on Local Science and Technology Development Fund Project of Hebei Province(No.236Z4307G,226Z4306G)Hebei Province Department of Education Youth Fund Project(QN 2025349).
文摘Wide-band gap perovskites combined with silicon(Si)in tandem solar cells offer a cost-effective path to industrialization.However,surface recombination at the buried interface of perovskite solar cells(PSCs)and the edge surface of Si solar cells affects their efficiency and stability.Herein,we design a multi-site passivation agent to simultaneously suppress defect recombination in hole transfer layer(HTL)surface,perovskite buried interface,and Si edge for efficient tandem solar cells.The increased ratio of Ni^(3+)/Ni^(2+)reduces the nickel oxide(NiO_(x))/perovskite interface reaction and improves the conductivity of the NiO_(x) HTL.The reconstructed underlayer is more propitious to the perovskite deposition,which releases the residual strain,resulting in the enhancement of the efficiency and stability of PSCs.Moreover,the multi-site passivation agent presents a distinctive passivation effect for edge surface of Si solar cells.Power conversion efficiencies(PCEs)of 21.95% and 20.01% are obtained at opaque and semitransparent PSCs,respectively.Additionally,a four-terminal tandem solar cell exhibits a PCE of 31.02% with+1.19% abs PCE increase for bottom cell by edge surface passivation.Overall,this work provides a simple and multi-site surface defect passivation strategy for obtaining high-efficiency and stable perovskite and perovskite tandem solar cells.
基金supported by the National Natural Science Foundation of China(Nos.52402048 and 62274054)the“333 project”of Hebei Province(No.C20221014)+6 种基金Hebei Provincial Innovation Capability Enhancement Program Project(No.24464302D)Hebei University President’s Research Fund(No.XZJJ202201)Natural Science Foundation of Hebei Province(Nos.F2023201001 and F2023201005)Interdisciplinary research project of Hebei University(No.DXK202303)the Central Guidance on Local Science and Technology Development Fund Project of Hebei Province(Nos.236Z4307G and 226Z4306G)Hebei province Science Foundation for Distinguished Young Scholars(No.F2021201035)S&T Program of Hebei(No.242Q4501Z).
文摘Photovoltaic/thermoelectric(PV/TE)coupling systems simultaneously cool solar cells and recover waste heat.Single-wall carbon nanotubes(SWCNTs)films are expected to simultaneously exhibit their electrical conductivity,thermal conductivity,and thermoelectric properties in this application.Fabricating SWCNTs films with polymer-dispersed SWCNTs are simple,safe,and scalable.However,the difficulty in simultaneously enhancing both dispersion quality and SWCNT concentration significantly limit the electrical conductivity of these films.Herein,we develop a SWCNT redispersion method in Nafion ethanol system to achieve well-dispersion at high SWCNT concentrations.Using this dispersion,A4-sized films were readily prepared,achieving remarkable electrical conductivity of 1.97 MS/m.The large-area film exhibits a high power factor(654.37μW/(m·K^(2)))and apparent thermal conductivity(529 W/(m·K)),and is integrated into a 330 cm^(2)thermoelectric/photovoltaic coupling system.The PV output power increases by 220 mW.An additional 70 mV thermoelectric voltage is generated.Moreover,the investigation of the drying process unravels how polymer,solvent and SWCNT concentration collectively dominate the film uniformity.This work significantly enhances the electrical conductivity of polymer-dispersed SWCNTs and explores an application direction that simultaneously utilizes their high thermoelectric performance and thermal conductivity,highlighting their great application potential in PV/TE systems.
基金We gratefully acknowledge support from the National Program on Key R&D of China(2018YFB1500201)Key Research and Development Program of Hebei Province(No.20314305D)+9 种基金National Natural Science Foundation of China(62274054)Hebei Province Science Foundation for Distinguished Young Scholars(F2021201035)Top Young Outstanding Innovative Talents Program of Hebei Province(BJ2021006)The Natural Science Foundation of Hebei Province(F2019204325 and F2022201002)"333 project"of Hebei Province(C20221014)the Cooperative Scientific Research Project of“Chunhui Program”of Ministry of Education(2018-7),the Central Guidance on Local Science and Technology Development Fund Project of Hebei Province(No.226Z4306G)Foreign Scientist Joint Research of Hebei province(2021-16)the German Research Foundation(DFG)(FL 834/2-1,FL 834/2-2,FL 834/5-1,and FL 834/7-1)Postgraduate Innovation Funding Project of Hebei University(HBU2021ss068)The High-Performance Computing Platform of Hebei University。
文摘Diverse defects in copper indium gallium diselenide solar cells cause nonradiative recombination losses and impair device performance.Here,an organic passivation scheme for surface and grain boundary defects is reported,which employs an organic passivation agent to infiltrate the copper indium gallium diselenide thin films.A transparent conductive passivating(TCP)film is then developed by incorporating metal nanowires into the organic polymer and used in solar cells.The TCP films have a transmittance of more than 90%in the visible and nearinfrared spectra and a sheet resistance of~10.5Ω/sq.This leads to improvements in the open-circuit voltage and the efficiency of the organic passivated solar cells compared with control cells and paves the way for novel approaches to copper indium gallium diselenide defect passivation and possibly other compound solar cells.
基金supported by the National Key R&D Program of China(Nos.2018YFA0208402 and 2020YFA0714700)the National Natural Science Foundation of China(Nos.11634014 and 51372269)the“Strategic Priority Research Program”of the Chinese Academy of Sciences(No.XDA09040202).
文摘Lithium cobalt oxide(LCO),the first commercialized cathode active material for lithium-ion batteries,is known for high voltage and capacity.However,its application has been limited by relatively low capacity and stability at high C-rates.Reducing particle size is considered one of the most straightforward and effective strategies to enhance ion transfer,thus increasing the rate performance.However,side reactions are simultaneously enhanced as the specific surface area increases.Herein,we investigate the impact of LCO particles with varying size distributions and optimize the particle size.To modulate the side reactions associated with particle size reduction,an ultrathin carbon nanotube film(UCNF)is introduced to coat the cathode surface.With this simple process and optimized particle size,the rate performance improves significantly,normal commercial LCO achieves 118 mA·h·g^(−1)at 3.0–4.3 V and 20 C(0.72 mA·h·cm^(−2)),corresponding to power density of 8732 W·kg^(−1).This method is applied to high voltage as well,152 mA·h·g^(−1)at 3.0–4.6 V and 20 C(0.99 mA·h·cm^(−2))was achieved with high-voltage LCO(HVLCO),corresponding to power density of 11,552 W·kg^(−1).The cycling stability is also enhanced,with the capacity retention maintaining more than 96%after 100 cycles at 0.1 C.For the first time,UCNF is demonstrated to suppress the excessive decomposition of the electrolytes and solvents by blocking electron injection/extraction between LCO and electrolyte solution.Our findings provide a simple method for improving LCO rate performance,especially at high C-rates.
