Perovskite solar cells(PSC)are considered as a promising photovoltaic technology due to their low cost and high efficiency exceeding 26.8%.Ultra-lightweight flexible perovskite solar cells(FPSCs)can be applied to many...Perovskite solar cells(PSC)are considered as a promising photovoltaic technology due to their low cost and high efficiency exceeding 26.8%.Ultra-lightweight flexible perovskite solar cells(FPSCs)can be applied to many fields such as architecture and portable devices.Although the photovoltaic conversion efficiency(PCE)of FPSC has exceeded 24%in the past few years,further application of FPSC is constrained by the challenges posed by limitation of critical material components.Here,we discussed recent research progress of key FPSC materials,mechanical endurance,low-temperature fabrication,etc.With the advantages of high brightness,collimation and resolution,we specially introduced the application of synchrotron radiation grazing incidence wide-angle X-ray scattering(GIWAXS)to directly observe the perovskite buried interface structure and corresponding mechanical stability of FPSCs without any damage.Finally,we summarize the challenges and propose an outlook about the large-scale preparation of efficient and stable FPSC modules.展开更多
Metal electrode corrosion driven by halide migration and interfacial defects remains a significant bottleneck limiting the operational stability and photo-voltaic performance of perovskite solar cells(PSCs),particular...Metal electrode corrosion driven by halide migration and interfacial defects remains a significant bottleneck limiting the operational stability and photo-voltaic performance of perovskite solar cells(PSCs),particularly in devices with varied bandgaps.Herein,we present a multifunctional interface engineering strategy by incorporating the IL 1-butylpyridinium tetrafluoroborate(BPYBF_(4))into the PCBM electron transport layer to simultaneously address these issues.The BF_(4)^(+)anions coordinate with the Ag^(+),forming a corrosion-resistant layer that mitigates iodine-induced degradation.Concurrently,the BPY+cations react with residual PbI_(2)at the perovskite surface,inducing the formation of a 1D perovskite capping layer that effectively passivates interfacial defects and suppresses ion migration.Phase-transition process during film con-version was systematically investigated,revealing a gradual transformation of residual PbI_(2)into a protective 1D perovskite structure upon BPYB incorporation.Additionally,the presence of ionized PCBM enhances surface potential alignment,promoting efficient electron extraction and reducing non-radiative recombination losses.This strategy demonstrates broad applicability-not only enhancing the performance of 1.55 eV normal-bandgap PSCs but also achieving outstanding efficiency for wide-bandgap PSCs,with PCEs of 22.69%for 1.67 eV and 18.60%(certified at 17.75%)for 1.85 eV,respectively.This work provides a facile and scalable approach to simultaneously protect the electrode and stabilize the perovskite films,offering a promising strategy for varied bandgaps PSCs in both single-junction and tandem configurations.展开更多
Chiral perovskites(CPs)have attracted enormous attentions since they have combined chirality and optoelectrical properties well which is promising in circularly polarized luminescence(CPL)application and of great impo...Chiral perovskites(CPs)have attracted enormous attentions since they have combined chirality and optoelectrical properties well which is promising in circularly polarized luminescence(CPL)application and of great importance for future spin-optoelectronics.However,there is a key contradiction that in chiral perovskites chirality distorts the crystal structure,leading to poor photoluminescence(PL)properties.Achieving the balance between chirality and PL is a major challenge for strong CPL from chiral perovskites.Differently,two-dimensional(2D)chiral perovskite has shown fascinating chiral induced spin selectivity(CISS)effect which can act as spin injector under ambient conditions.Here,we propose an effective strategy to achieve high CPL activity generated from quantum dots(QDs)by introducing 2D chiral perovskite as a chiral source,providing spin polarized carriers through the CISS effect.The as-synthesized QDs/CP composites exhibit dissymmetry factors(glum)up to 9.06×10^(−3).For the first time,we performed grazing incident wide angle X-ray scattering(GIWAXS)measurements,showing the chirality originates from the distorted lattices caused by the large chiral organic cations.Besides,time-resolved PL(TR-PL)measurements verify the enhanced CPL activity should be attributed to the charge transport between two components.These findings provide a useful method to achieve CPL in QDs/2D chiral perovskite heterojunctions which could be promising in spinoptoelectronics application.展开更多
基金supported by Photon Science Research Center For Carbon Dioxide,Project of the National Natural Science Foundation of China(22332003)supported by the National Natural Science Foundation of China(12175298,12075309)+10 种基金the National Natural Science Foundation of China(62404176)Shanghai Science and Technology Innovation Action Plan(22JC1403800)Shanghai Municipal Science and Technology Commission(23JC1403300)2022 Self Deployed Instrument Design Project of Shanghai Advanced Research Institutethe Research Grant from the Shanghai Sailing Program(17YF1423700)Shanghai Municipal Commission for Science and Technology(20ZR1464100)Youth Innovation Promotion Association CAS(2021284)Fudan University Talent Introduction Projectthe support from the China Postdoctoral Science Foundation(2023M742732)the Postdoctoral Fellowship Program of CPSF(GZC20241303)the Fundamental Research Funds for the Central Universities(XJSJ24100)。
文摘Perovskite solar cells(PSC)are considered as a promising photovoltaic technology due to their low cost and high efficiency exceeding 26.8%.Ultra-lightweight flexible perovskite solar cells(FPSCs)can be applied to many fields such as architecture and portable devices.Although the photovoltaic conversion efficiency(PCE)of FPSC has exceeded 24%in the past few years,further application of FPSC is constrained by the challenges posed by limitation of critical material components.Here,we discussed recent research progress of key FPSC materials,mechanical endurance,low-temperature fabrication,etc.With the advantages of high brightness,collimation and resolution,we specially introduced the application of synchrotron radiation grazing incidence wide-angle X-ray scattering(GIWAXS)to directly observe the perovskite buried interface structure and corresponding mechanical stability of FPSCs without any damage.Finally,we summarize the challenges and propose an outlook about the large-scale preparation of efficient and stable FPSC modules.
基金Nazarbayev University under Collaborative Research Program,Grant/Award Number:211123CRP1613Faculty Development Competitive Research Grants Program for 2024-2026,Grant/Award Number:201223FD8801+7 种基金Scientific Research Startup Fund for Spray-on Perovskite Photovoltaics R&D Center,Grant/Award Numbers:602331011PQ,2024ZDZX3079Guangdong Basic and Applied Basic Research Foundation,Grant/Award Number:2023A1515011677Scientific and Technical Innovation Council of Shenzhen,Grant/Award Number:20220812165832002Research Projects of Department of Education of Guangdong Province,Grant/Award Number:2023GCZX015Innovation Team Project of Guangdong,Grant/Award Number:2022KCXTD055National Key R&D Program of China,Grant/Award Number:2021YFA1601000Shanghai Municipal Science and Technology Major ProjectNational Natural Science Foundation of China,Grant/Award Numbers:12175295,U1932118。
文摘Metal electrode corrosion driven by halide migration and interfacial defects remains a significant bottleneck limiting the operational stability and photo-voltaic performance of perovskite solar cells(PSCs),particularly in devices with varied bandgaps.Herein,we present a multifunctional interface engineering strategy by incorporating the IL 1-butylpyridinium tetrafluoroborate(BPYBF_(4))into the PCBM electron transport layer to simultaneously address these issues.The BF_(4)^(+)anions coordinate with the Ag^(+),forming a corrosion-resistant layer that mitigates iodine-induced degradation.Concurrently,the BPY+cations react with residual PbI_(2)at the perovskite surface,inducing the formation of a 1D perovskite capping layer that effectively passivates interfacial defects and suppresses ion migration.Phase-transition process during film con-version was systematically investigated,revealing a gradual transformation of residual PbI_(2)into a protective 1D perovskite structure upon BPYB incorporation.Additionally,the presence of ionized PCBM enhances surface potential alignment,promoting efficient electron extraction and reducing non-radiative recombination losses.This strategy demonstrates broad applicability-not only enhancing the performance of 1.55 eV normal-bandgap PSCs but also achieving outstanding efficiency for wide-bandgap PSCs,with PCEs of 22.69%for 1.67 eV and 18.60%(certified at 17.75%)for 1.85 eV,respectively.This work provides a facile and scalable approach to simultaneously protect the electrode and stabilize the perovskite films,offering a promising strategy for varied bandgaps PSCs in both single-junction and tandem configurations.
基金Guangdong Basic and Applied Basic Research Foundation(Nos.2022A1515011071,2019A1515111093,and 2022A1515011614)the National Natural Science Foundation of China(Nos.62122034,61875082,61905107,62204107,and 62205138)+2 种基金Innovation Project of Department of Education of Guangdong Province(No.2019KTSCX157)Shenzhen Innovation Project(Nos.JCYJ20210324104413036 and JCYJ20190809152411655)Q.Q.W.and H.M.Z.acknowledge the support from China Postdoctoral Science Foundation(Nos.2021M691397 and 2021M691411).
文摘Chiral perovskites(CPs)have attracted enormous attentions since they have combined chirality and optoelectrical properties well which is promising in circularly polarized luminescence(CPL)application and of great importance for future spin-optoelectronics.However,there is a key contradiction that in chiral perovskites chirality distorts the crystal structure,leading to poor photoluminescence(PL)properties.Achieving the balance between chirality and PL is a major challenge for strong CPL from chiral perovskites.Differently,two-dimensional(2D)chiral perovskite has shown fascinating chiral induced spin selectivity(CISS)effect which can act as spin injector under ambient conditions.Here,we propose an effective strategy to achieve high CPL activity generated from quantum dots(QDs)by introducing 2D chiral perovskite as a chiral source,providing spin polarized carriers through the CISS effect.The as-synthesized QDs/CP composites exhibit dissymmetry factors(glum)up to 9.06×10^(−3).For the first time,we performed grazing incident wide angle X-ray scattering(GIWAXS)measurements,showing the chirality originates from the distorted lattices caused by the large chiral organic cations.Besides,time-resolved PL(TR-PL)measurements verify the enhanced CPL activity should be attributed to the charge transport between two components.These findings provide a useful method to achieve CPL in QDs/2D chiral perovskite heterojunctions which could be promising in spinoptoelectronics application.
