Suppression of deep‑level traps via semicarbazide hydrochloride additives for high‑performance tin‑based perovskite solar cells  

作　　者：Wenbo Jia Yi Jing Han Zhang Baoyan Tian Huabo Huang Changlei Wang Ligang Xu 

机构地区：[1]Key Laboratory for Organic Electronics and Information Displays(KLOEID)and Jiangsu Key Laboratory for Biosensors,Institute of Advanced Materials(IAM),Nanjing University of Posts and Telecommunications,Nanjing 210023,China [2]Hubei Key Laboratory of Plasma Chemistry and Advanced Materials,Key Laboratory for Green Chemical Process of Ministry of Education,School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,China [3]School of Optoelectronic Science and Engineering and Collaborative Innovation Center of Suzhou Nano Science and Technology,Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province and Key Lab of Modern Optical Technologies of Education Ministry of China,Soochow University,Suzhou 215006,China [4]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Frontiers of Optoelectronics》2023年第4期205-213,共9页光电子前沿（英文版）

基　　金：supported in part by the National Natural Science Foundation of China(Grant No.62274094);the Natural Science Foundation of Jiangsu Higher Education Institutions(No.22KJB510011);the Open Project Program of Wuhan National Laboratory for Optoelectronics(No.2020WNLOKF012);the Key Laboratory of Modern Optical Technologies of Education Ministry of China,Soochow University(No.KJS2260);the Huali Talents Program of Nanjing University of Posts and Telecommunications,and the Jiangsu Provincial Government Scholarship for Overseas Studies.

摘　　要：Tin perovskites with exemplary optoelectronic properties ofer potential application in lead-free perovskite solar cells.However,Sn vacancies and undercoordinated Sn ions on the tin perovskite surfaces can create deep-level traps,leading to nonradiative recombination and absorption of nucleophilic O_(2)molecules,impeding further device efciency and stability.Here,in this study,a new additive of semicarbazide hydrochloride(SEM-HCl)with a N–C=O functional group was introduced into the perovskite precursor to fabricate high-quality flms with a low concentration of deep-level trap densities.This,in turn,serves to prevent undesirable interaction between photogenerated carriers and adsorbed oxygen molecules in the device’s operational environment,ultimately reducing the proliferation of superoxide entities.As the result,the SEM-HCl-derived devices show a peak efciency of 10.9%with improved device stability.These unencapsulated devices maintain almost 100%of their initial efciencies after working for 100 h under continuous AM1.5 illumination conditions.

关 键 词：Lead-free perovskite solar cells Deep-level traps Power conversion efciency Semicarbazide hydrochloride Stability 

分 类 号：TM914.4[电气工程—电力电子与电力传动]