典型文献
Extended X-ray absorption fine structure(EXAFS)of FAPbI3 for understanding local structure-stability relation in perovskite solar cells
文献摘要：
Perovskite solar cells(PSCs)employing formamidinium lead iodide(FAPbI3)have shown high efficiency.However,operational stability has been issued due to phase instability of α phase FAPbI3 at ambient tem-perature.Excess precursors in the perovskite precursor solution has been proposed to improve not only power conversion efficiency(PCE)but also device stability.Nevertheless,there is a controversial issue on the beneficial effect on PCE and/or stability between excess FAI and excess PbI2.We report here extended X-ray absorption fine structure(EXAFS)of FAPbI3 to study local structural change and explain the effect of excess precursors on photovoltaic performance and stability.Perovskite films prepared from the pre-cursor solution with excess Pbl2 shows better stability than those from the one with excess FAI,despite similar PCE.A rapid phase transition from α phase to non-perovskite δ phase is observed from the per-ovskite film formed by excess FAI.Furthermore,the(Pb-I)bond distance evaluated by the Pb LⅢ-edge EXAFS study is increased by excess FAI,which is responsible for the phase transition and poor device sta-bility.This work can provide important insight into local structure-stability relation in the FAPbI3-based PSCs.
文献关键词：
中图分类号：
作者姓名：
Dong-Ho Kang;Yong-Jun Park;Yun-Sung Jeon;Nam-Gyu Park
作者机构：
School of Chemical Engineering and Center for Antibonding Regulated Crystals,Sungkyunkwan University.Suwon 16419,Korea
文献出处：
引用格式：
[1]Dong-Ho Kang;Yong-Jun Park;Yun-Sung Jeon;Nam-Gyu Park-.Extended X-ray absorption fine structure(EXAFS)of FAPbI3 for understanding local structure-stability relation in perovskite solar cells)[J].能源化学,2022(04):549-554
A类：
Pbl2
B类：
Extended,ray,absorption,fine,structure,EXAFS,FAPbI3,understanding,local,relation,perovskite,solar,cells,Perovskite,PSCs,employing,formamidinium,lead,iodide,have,shown,high,efficiency,However,operational,been,issued,due,phase,instability,ambient,tem,perature,Excess,precursors,solution,proposed,improve,not,only,power,conversion,PCE,but,also,device,Nevertheless,there,controversial,beneficial,effect,between,excess,FAI,PbI2,We,report,extended,study,structural,change,explain,photovoltaic,performance,films,prepared,from,shows,better,than,those,one,despite,similar,rapid,transition,observed,formed,by,Furthermore,bond,distance,evaluated,edge,increased,which,responsible,poor,This,work,can,provide,important,insight,into
AB值：
0.491185
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