All-inorganic CsPbIBr2 perovskite solar cells(PSCs)have attracted considerable research attention in recent years due to their excellent thermal stability.However,their power conversion efficiencies(PCEs)are relatively low and still far below the theoretical limit.Here,we report the use of an organic dye molecule(namely VG1-C8)as a bifunctional interlayer between perovskite and the hole-transport layer in CsPbIBr2 PSCs.Combined experimental and theoretical calculation results disclose that the mul-tiple Lewis base sites in VG1-C8 can effectively passivate the trap states on the perovskite films.Meanwhile,the π-conjugated dye molecule significantly accelerates the hole extraction from the per-ovskite absorber as evidenced by the photoluminescence analysis.Consequently,the VG1-C8 treatment simultaneously boosts the photovoltage and photocurrent density values from 1.26 V and 10.80 mA cm-2 to 1.31 V and 12.44 mA cm-2,respectively.This leads to a significant enhancement of PCE from 9.20％to 12.10％under one sun irradiation(AM 1.5G).To our knowledge,this is the record efficiency reported so far for CsPbIBr2 PSCs.Thus,the present work demonstrates an effective interfacial passivation strategy for the development of highly efficient PSCs.

Qi Liu;Junming Qiu;Xianchang Yan;Yuemeng Fei;Yue Qiang;Qingyan Chang;Yi Wei;Xiaoliang Zhang;Wenming Tian;Shengye Jin;Ze Yu;Licheng Sun

State Key Laboratory of Fine Chemicals,Dalian University of Technology(DUT),Dalian 116024,Liaoning,China;School of Materials Science and Engineering,Beihang University,Beijing 100191,China;State Key Laboratory of Molecular Reaction Dynamics and the Dynamic Research Center for Energy and Environmental Materials,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China;Key Laboratory of Materials Modification by Laser,Ion,and Electron Beams(Ministry of Education),Dalian University of Technology(DUT),Dalian 116024,Liaoning,China;Center of Artificial Photosynthesis for Solar Fuels,School of Science,Westlake University,Hangzhou 310024,Zhejiang,China;Department of Chemistry,School of Engineering Sciences in Chemistry,Biotechnology and Health,KTH Royal Institute of Technology,10044 Stockholm,Sweden

能源化学

[1]Qi Liu;Junming Qiu;Xianchang Yan;Yuemeng Fei;Yue Qiang;Qingyan Chang;Yi Wei;Xiaoliang Zhang;Wenming Tian;Shengye Jin;Ze Yu;Licheng Sun-.Surface passivation and hole extraction:Bifunctional interfacial engineering toward high-performance all-inorganic CsPbIBr2 perovskite solar cells with efficiency exceeding 12％)[J].能源化学,2022(11):387-393

CsPbIBr2,VG1

Surface,passivation,hole,extraction,Bifunctional,interfacial,engineering,toward,performance,all,inorganic,perovskite,solar,cells,efficiency,exceeding,All,PSCs,have,attracted,considerable,research,attention,recent,years,due,their,excellent,thermal,stability,However,power,conversion,efficiencies,PCEs,are,relatively,still,far,below,theoretical,limit,Here,use,dye,molecule,namely,C8,bifunctional,interlayer,between,transport,Combined,experimental,calculation,results,disclose,that,tiple,Lewis,base,sites,effectively,passivate,trap,states,films,Meanwhile,conjugated,significantly,accelerates,from,absorber,evidenced,by,photoluminescence,analysis,Consequently,treatment,simultaneously,boosts,photovoltage,photocurrent,density,values,mA,respectively,This,leads,enhancement,under,one,sun,irradiation,AM,To,our,knowledge,this,record,reported,Thus,present,work,demonstrates,strategy,development,highly,efficient

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