Interfacial modification using the cross-linkable tannic acid for highly-efficient perovskite solar cells with excellent stability  

作　　者：Xing Gao Lirong Rong Fei Wu Yen-Hung Lin Ye Zeng Junhong Tan Rongxing He Cheng Zhong Linna Zhu 

机构地区：[1]Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy,School of Materials&Energy,Southwest University,Chongqing 400715,China [2]Hubei Key Lab on Organic and Polymeric Optoelectronic Materials,Department of Chemistry,Wuhan University,Wuhan 430072,Hubei,China [3]Key Laboratory of Luminescence Analysis and Molecular Sensing,Ministry of Education,School of Chemistry and Chemical Engineering,Southwest University,Chongqing 400715,China [4]Department of Electronic and Computer Engineering,The Hong Kong University of Science and Technology,Clear Water Bay,Kowloon 999077,Hong Kong,China [5]State Key Laboratory of Advanced Displays and Optoelectronics Technologies,The Hong Kong University of Science and Technology,Clear Water Bay,Kowloon 999077,Hong Kong,China

出　　处：《Journal of Energy Chemistry》2024年第4期236-244,共9页能源化学（英文版）

基　　金：supported by the General Program of Chongqing Natural Science Foundation(CSTB2022NSCQMSX1227 and CSTB2022NSCQ-MSX0459);the supports from the Fundamental Research Funds for the Central Universities(SWU-XDJH202314)。

摘　　要：Although the performance of perovskite solar cells(PSCs)has been dramatically increased in recent years,stability is still the main obstacle preventing the PSCs from being commercial.PSC device instability can be caused by a variety of reasons,including ions diffusion,surface and grain boundary defects,etc.In this work,the cross-linkable tannic acid(TA)is introduced to modify perovskite film through post-treatment method.The numerous organic functional groups(–OH and C=O)in TA can interact with the uncoordinated Pb^(2+)and I^(-)ions in perovskite,thus passivating defects and inhibiting ions diffusion.In addition,the formed TA network can absorb a small amount of the residual moisture inside the device to protect the perovskite layer.Furthermore,TA modification regulates the energy level of perovskite,and reduces interfacial charge recombination.Ultimately,following TA treatment,the device efficiency is increased significantly from 21.31%to 23.11%,with a decreased hysteresis effect.Notably,the treated device shows excellent air,thermal,and operational stability.In light of this,the readily available,inexpensive TA has the potential to operate as a multipurpose interfacial modifier to increase device efficiency while also enhancing device stability.

关 键 词：Tannic acid Defect passivation lons diffusion HYDROPHILIC STABILITY Perovskite solar cells 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]