Tailoring component incorporation for homogenized perovskite solar cells  

为均质化的钙钛矿太阳能电池量身定制掺入组分

作　　者：Wenhan Yang Junmin Xia Yuexin Lin Hao Gu Fengqiang Ma Yumin Ren Fenqi Du Dejian Yu Jinfeng Liao Yiwang Chen Guojia Fang Shengchun Yang Chao Liang 杨文涵;夏俊民;林越辛;顾浩;马凤强;任禹敏;杜粉琦;余德见;廖金风;陈义旺;方国家;杨生春;梁超

机构地区：[1]MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter,School of Physics,National Innovation Platform(Center)for Industry-Education Integration of Energy Storage Technology,Xi’an Jiaotong University,Xi’an 710049,China [2]State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM),Nanjing University of Posts&Telecommunications,Nanjing 210023,China [3]Joint Key Laboratory of the Ministry of Education,Institute of Applied Physics and Materials Engineering,University of Macao,Macao 999078,China [4]Shandong Zhixin Intelligent Equipment Co.,LTD,Jinan 250101,China [5]School of Chemistry,Xi’an Jiaotong University,Xi’an 710049,China [6]National Engineering Research Center for Carbohydrate Synthesis,Key Laboratory of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education,Jiangxi Normal University,Nanchang 330022,China [7]Key Laboratory of Artificial Micro/Nano Structures of Ministry of Education,School of Physics and Technology,Wuhan University,Wuhan 430072,China

出　　处：《Science Bulletin》2024年第16期2555-2564,共10页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(62105292);Shaanxi Fundamental Science Research Project for Mathematics and Physics(22JSY015);Young Talent Fund of Xi’an Association for Science and Technology(959202313020);the Natural Science Foundation of Shaanxi Province(2021GXLH-Z-0 and 2020JZ-02);the project of Innovative Team of Shaanxi Province(2020TD-001);the China Fundamental Research Funds for the Central Universities。

摘　　要：Deep-level traps at the buried interface of perovskite and energy mismatch problems between the perovskite layer and heterogeneous interfaces restrict the development of ideal homogenized films and efficient perovskite solar cells(PSCs)using the one-step spin-coating method.Here,we strategically employed sparingly soluble germanium iodide as a homogenized bulk in-situ reconstruction inducing material preferentially aggregated at the perovskite buried interface with gradient doping,markedly reducing deep-level traps and withstanding local lattice strain,while minimizing non-radiative recombination losses and enhancing the charge carrier lifetime over 9μs.Furthermore,this gradient doping assisted in modifying the band diagram at the buried interface into a desirable flattened alignment,substantially mitigating the energy loss of charge carriers within perovskite films and improving the carrier extraction equilibrium.As a result,the optimized device achieved a champion power conversion efficiency of 25.24% with a fill factor of up to 84.65%,and the unencapsulated device also demonstrated excellent light stability and humidity stability.This work provides a straightforward and reliable homogenization strategy of perovskite components for obtaining efficient and stable PSCs.

关 键 词：Homogenized perovskite films Lattice strain relaxation Deep-level traps Carrier extraction equilibrium Perovskite solar cells 

分 类 号：TM914.4[电气工程—电力电子与电力传动]