Structurally Flexible 2D Spacer for Suppressing the Electron-Phonon Coupling Induced Non-Radiative Decay in Perovskite Solar Cells  

作　　者：Ruikun Cao Kexuan Sun Chang Liu Yuhong Mao Wei Guo Ping Ouyang Yuanyuan Meng Ruijia Tian Lisha Xie Xujie Lü Ziyi Ge 

机构地区：[1]Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,People’s Republic of China [2]School of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315211,People’s Republic of China [3]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,People’s Republic of China [4]Center for High Pressure Science and Technology Advanced Research(HPSTAR),Shanghai 201203,People’s Republic of China

出　　处：《Nano-Micro Letters》2024年第9期325-340,共16页纳微快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(U21A20331,81903743,22005322,22279151,and 22275004);National Science Fund for Distinguished Young Scholars(21925506).

摘　　要：This study presents experimental evidence of the dependence of non-radiative recombination processes on the electron-phonon coupling of perovskite in perovskite solar cells(PSCs).Via A-site cation engineering,a weaker electron-phonon coupling in perovskite has been achieved by introducing the structurally soft cyclohexane methylamine(CMA^(+))cation,which could serve as a damper to alleviate the mechanical stress caused by lattice oscillations,compared to the rigid phenethyl methylamine(PEA^(+))analog.It demonstrates a significantly lower non-radiative recombination rate,even though the two types of bulky cations have similar chemical passivation effects on perovskite,which might be explained by the suppressed carrier capture process and improved lattice geometry relaxation.The resulting PSCs achieve an exceptional power conversion efficiency(PCE)of 25.5%with a record-high opencircuit voltage(V_(OC))of 1.20 V for narrow bandgap perovskite(FAPbI_(3)).The established correlations between electron-phonon coupling and non-radiative decay provide design and screening criteria for more effective passivators for highly efficient PSCs approaching the Shockley-Queisser limit.

关 键 词：Electron-phonon coupling A-site cation engineering Non-radiative recombination 

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]