Fullerene modification of WO_(3) electron transport layer toward high-efficiency MA-free perovskite solar cells with eliminated light-soaking effect  

作　　者：Xin Yu Bing Cai Jinxia Zhang Xingcheng Li Xue Wang Gongtao Duan Wenfeng Zhang Xinhang Liu Wen-Hua Zhang Shangfeng Yang 

机构地区：[1]Hefei National Laboratory for Physical Sciences at Microscale,CAS Key Laboratory ofMaterials for Energy Conversion,Anhui Laboratory of Advanced Photon Science and Technology,Department of Materials Science and Engineering,University of Science and Technology of China,Hefei,China [2]Institute of Chemical Materials,China Academy of Engineering Physics,Mianyang,China [3]Institute of Photovoltaic,Southwest Petroleum University,Chengdu,China [4]Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies,School of Materials and Energy,Yunnan University,Kunming,China [5]Jiangsu Collaborative Innovation Center for Photovoltaic Science and Engineering,Changzhou University,Changzhou,China

出　　处：《Interdisciplinary Materials》2023年第3期459-469,共11页交叉学科材料（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Numbers:51925206,U1932214;National Key Research and Development Program of China,Grant/Award Number:2017YFA0402800。

摘　　要：In perovskite solar cells(PSCs),the light-soaking effect,which means device performance changes obviously under continuous light illumination,is potentially harmful to loaded devices as well as accurately assessing their efficiency.Herein,chemically stable tungsten trioxide(WO3)with high electron mobility is used as electron transport material in methylamine(MA)-free PSCs.However,the light-soaking effect is observed apparently in our devices.A fullerene derivative,C60 pyrrolidine Tris-acid(CPTA),is introduced to modify the interface between WO3 and perovskite(PVK)layers,which can bond with WO3 and PVK simultaneously,leading to the passivation of the defect and the suppression of trap-assisted nonradiative recombination.What is more,the introduction of CPTA can enhance the built-in electric field between WO3 and PVK layers,thereby facilitating the electron extraction and inhibiting the carrier accumulation at the interface.Consequently,the lightsoaking effect of WO3-based PSCs has been eliminated,and the power conversion efficiency has been boosted from 17.4%for control device to 20.5%for WO3/CPTA-based PSC with enhanced stability.This study gives guidance for the design of interfacial molecules to eliminate the light-soaking effect.

关 键 词：CPTA-modified WO3 interfacial engineering light-soaking effect MA-free perovskite stability 

分 类 号：O64[理学—物理化学]