Improving Ultraviolet Stability of Perovskite Solar Cells via Singlet Fission Down-Conversion  

作　　者：Yanda zhang Shuqin Xiao Wangping Sheng Jia Yang Licheng Tan Yiwang Chen 

机构地区：[1]College of Chemistry and Chemical Engineering,Nanchang University,999 Xuefu Avenue,Nanchang,Jiangxi 330031,China [2]Institute of Polymers and Energy Chemistry,Nanchang University,999 Xuefu Avenue,Nanchang,Jiangxi 330031,China [3]National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education,Jiangxi Normal University,99 Ziyang Avenue,Nanchang,Jiangxi 330022,China [4]Peking University Yangtze Delta Institute of Optoelectronics,Nantong,Jiangsu 226010,China [5]School of Physics and Materials Science,Nanchang University,999 Xuefu Avenue,Nanchang,Jiangxi 330031,China

出　　处：《Chinese Journal of Chemistry》2023年第9期1057-1065,共9页中国化学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(NSFC)(52063019,51973088,51963016,51833004,U20A20128,U1801256);"Key Project of Jiangxi Provincial Natural Science Foundation(20224ACB203007)".

摘　　要：The instability of perovskite materials under continuous ultraviolet(UV)light irradiation and high sensitivity in humid environments remain obstacles to future commercialization.Especially,the photovoltaic performance of perovskite solar cells(PVSCs)is prone to decline under UV light exposure for sustained periods of time.However,in conventional methods,preventing UV light from entering PVSCs usually comes at the expense of reducing short circuit photocurrent(Jsc).Herein,the UV stability of PVSCs is modified by in-troducing a singlet fission down-conversion layer 6,13-bis(triisopropylsilylethynyl)pentacene(TIPS-PEN)via one-step anti-solvent method without sacrificing device efficiency.The introduction of down conversion layer can not only improve the Jsc by converting UV light into multiple excitons,but also enhance the open-circuit voltage(Voc)owing to a better matched energy level alignment at the perovskite/spiro-OMeTAD interface.Consequently,the TIPS-PEN incorporated PVSCs attain the champion power conversion effi-ciency(PCE)up to 22.92%accompanied with dramatically increased UV photostability which can retain 80%of its primitive PCE un-der continuous UV light soaking for 150 h.Moreover,the unencapsulated PVSCs with TIPS-PEN exhibit remarkable moisture stability which can sustain over 80%of the initial value under air conditions(50%relative humidity,25℃)after 1000 h.

关 键 词：Perovskite solar cells DOWN-CONVERSION Singlet fission Ultraviolet light stability Synergetic effect Antisolvent Perovskites passivation 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TM914.4[电气工程—电力电子与电力传动]