Surface repair of wide-bandgap perovskites for high-performance all-perovskite tandem solar cells  

作　　者：Xiaojing Lv Weisheng Li Jin Zhang Yujie Yang Xuefei Jia Yitong Ji Qianqian Lin Wenchao Huang Tongle Bu Zhiwei Ren Canglang Yao Fuzhi Huang Yi-Bing Cheng Jinhui Tong 

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,Hubei,China [2]Key Lab of Artificial Micro-and Nano-Structures of Ministry of Education of China,School of Physics and Technology,Wuhan University,Wuhan 430072,Hubei,China [3]Department of Electrical and Electronic Engineering,Photonics Research Institute(PRI),Research Institute for Intelligent Wearable Systems(iWEAR),The Hong Kong Polytechnic University,999077,Hong Kong,China [4]Laboratory of Advanced Materials,Fudan University,Shanghai 200438,China [5]Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory,Foshan 528200,Guangdong,China

出　　处：《Journal of Energy Chemistry》2024年第6期64-70,I0003,共8页能源化学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(52330004);the Fundamental Research Funds for the Central Universities(WUT:2023IVA075 and 2023IVB009);the financial support from RISE project Grant(Q-CDBK);Start-up Fund for RAPs under the Strategic Hiring Scheme(PoluU)(1-BD1H);PRI Strategic Grant(1-CD7X);RI-iWEAR Strategic Supporting Scheme(1-CD94)。

摘　　要：Wide-bandgap(WBG)perovskite solar cells(PSCs)play a fundamental role in perovskite-based tandem solar cells.However,the efficiency of WBG PSCs is limited by significant open-circuit voltage losses,which are primarily caused by surface defects.In this study,we present a novel method for modifying surfaces using the multifunctional S-ethylisothiourea hydrobromide(SEBr),which can passivate both Pb^(-1)and FA^(-1)terminated surfaces,Moreover,the SEBr upshifted the Fermi level at the perovskite interface,thereby promoting carrier collection.This proposed method was effective for both 1.67 and 1.77 eV WBG PSCs,achieving power conversion efficiencies(PCEs)of 22.47%and 19.90%,respectively,with V_(OC)values of 1.28 and 1.33 V,along with improved film and device stability.With this advancement,we were able to fabricate monolithic all-perovskite tandem solar cells with a champion PCE of 27.10%,This research offers valuable insights for passivating the surface trap states of WBG perovskite through rational multifunctional molecular engineering.

关 键 词：Wide-bandgap perovskite Surface defect Multifunctional molecule All-perovskite tandem solar cells 

分 类 号：TM914.4[电气工程—电力电子与电力传动]