Flexible molecules dedicate to release strain of inverted inorganic perovskite solar cell  

作　　者：Hongrui Sun Sanlong Wang Pengyang Wang Yali Liu Shanshan Qi Biao Shi Ying Zhao Xiaodan Zhang 

机构地区：[1]Institute of Photoelectronic Thin Film Devices and Technology,Renewable Energy Conversion and Storage Center,State Key Laboratory of Photovoltaic Materials and Cells,Nankai University,Tianjin 300350,China [2]Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin,Tianjin 300350,China [3]Haihe Laboratory of Sustainable Chemical Transformations,Tianjin 300192,China [4]Engineering Research Center of Thin Film Photoelectronic Technology of Ministry of Education,Tianjin 300350,China [5]Collaborative Innovation Center of Chemical Science and Engineering(Tianjin),Tianjin 300072,China

出　　处：《Journal of Energy Chemistry》2025年第1期87-93,共7页能源化学(英文版)

基　　金：financial support of National Key Research and Development Program of China(Grant No.2022YFB04200302);joint funds of National Natural Science Foundation of China(Grant No.62104115);National Natural Science Foundation of China(Grant No.U21A2072);Overseas Expertise Introduction Project for Discipline Innovation of Higher Education of China(Grant No.B16027);Key R&D Program of Hebei Province(No.19214301D);Yunnan Provincial Science and Technology Project at Southwest United Graduate School(No.202302A0370009);Haihe Laboratory of Sustainable Chemical Transformations;Fundamental Research Funds for the Central Universities,Nankai University。

摘　　要：The tensile strain in inorganic perovskite films induced by thermal annealing is one of the primary factors contributing to the inefficiency and instability of inorganic perovskite solar cells(IPSCs),which reduces the defect formation energy.Here,a flexible molecule 5-maleimidovaleric acid(5-MVA)was introduced as a strain buffer to release the residual strain of CsPbI_(2.85)Br_(0.15)perovskite.Maleic anhydride and carboxyl groups in 5-MVA interact strongly with the uncoordinated Pb^(2+)through Lewis acid-base reaction,thus tightly“pull”the perovskite lattice.The in-between soft carbon chain increased the structural flexibility of CsPbI_(2.85)Br_(0.15)perovskite materials,which effectively relieved the intrinsic internal strain of CsPbI_(2.85)Br_(0.15),resisted the corrosion of external strain,and also reduced the formation of defects such as VIand Pb0.In addition,the introduction of 5-MVA improved crystal quality,passivated residual defects,and narrowed energy level barriers.Eventually,power conversion efficiency(PCE)of NiOxbased inverted IPSCs increased from 19.25%to 20.82%with the open-circuit voltage enhanced from 1.164 V to 1.230 V.The release of strain also improved the stability of CsPbI_(2.85)Br_(0.15)perovskite films and devices.

关 键 词：Inverted inorganic perovskite solar cells Flexible molecules Strain release Crystallization Energy barrier High PCE 

分 类 号：TM914.4[电气工程—电力电子与电力传动]