Mixed 2D-Dion–Jacobson/3D Sn-Pb alloyed perovskites for efficient photovoltaic solar devices  

作　　者：Zhili Lu Chaohui Li Hongwei Lai Xinming Zhou Chunfeng Wang Xianhu Liu Fei Guo Caofeng Pan 

机构地区：[1]National Engineering Research Center for Advanced Polymer Processing Technology,Key Laboratory of Advanced Material Processing&Mold(Ministry of Education),Zhengzhou University,Zhengzhou 450002,China [2]Institute of New Energy Technology,College of Information Science and Technology,Jinan University,Guangzhou 510632,China [3]Beijing Institute of Nanoenergy and Nanosystems,Chinese Academy of Sciences,National Center for Nanoscience and Technology(NCNST),Beijing 100083,China [4]Institute of Materials for Electronics and Energy Technology(i-MEET),Friedrich-Alexander University Erlangen-Nürnberg,Martensstrasse 7,Erlangen 91058,Germany

出　　处：《Nano Research》2023年第2期3142-3148,共7页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.62174069);Natural Science Foundation of Guangdong Province(No.2020A1515010853).

摘　　要：Tin-lead(Sn-Pb)alloyed perovskites with tunable bandgaps hold great potential for constructing highly efficient single-junction and tandem photovoltaic devices.However,the efficiency and stability of Sn-Pb perovskite solar cells(PSCs)are greatly hampered by severe nonradiative recombination due to the easy oxidation of Sn(II).In this work,we report the construction of mixed dimensional two-dimensional(2D)Dion–Jacobson(DJ)and three-dimensional(3D)perovskites to improve the efficiency and stability of Sn-Pb alloyed PSCs.Introducing a small amount of 1,4-butanediammonium diiodide as spacer cations of DJ perovskites into precursor,the prepared mixed dimensional Sn-Pb alloyed perovskites exhibit reduced trap-state density due to the passivation of 2D DJ perovskites.As a result,nonradiative charge recombination is greatly suppressed.The prepared Sn-Pb alloyed PSCs based on 2D-DJ/3D heterojunction deliver a power conversion efficiency of 19.02%with an impressive fill factor of 80%.As well,improved device stability is realized due to the presence of DJ perovskites which serves as a protection barrier against oxidation and water invasion.

关 键 词：Sn-Pb perovskite narrow bandgap Dion–Jacobson perovskite solar cells two-dimensional(2D)/three-dimensional(3D) 

分 类 号：TM914.4[电气工程—电力电子与电力传动]