Time-resolved photoluminescence:a precision tool for shallow trap density determination in perovskite films  

作　　者：Wei Chen Yifeng Shi Pengxiang Wang Guodong Zhang Hu Wang Yifan Zheng Yuchuan Shao 陈威;史亦沣;王鹏祥;张国栋;王虎;郑毅帆;邵宇川(Key Laboratory of Materials for High-Power Laser,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;School of Material Science and Technology,ShanghaiTech University,Shanghai 201210,China)

机构地区：[1]Key Laboratory of Materials for High-Power Laser,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China [2]School of Material Science and Technology,ShanghaiTech University,Shanghai 201210,China

出　　处：《Chinese Optics Letters》2024年第8期124-130,共7页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.62104234 and 52103279);the Shanghai Sailing Program(No.21YF1454000)。

摘　　要：Determining the trap density in the absorbing layer thin film of perovskite solar cells is a critically important task,as it directly influences the efficiency of the devices.Here,we proposed time-resolved photoluminescence(TRPL)as a nondestructive method to assess trap density.A model was constructed to investigate carrier recombination and transition in perovskite materials.The model was utilized for numerical calculations and successfully fitted TRPL signals of perovskite materials.Furthermore,a genetic algorithm was employed to optimize the parameters.Finally,statistical methods were applied to obtain the parameters associated with the trap states of the material.This approach facilitates the successful determination of trap densities for different samples with clear differentiation.

关 键 词：perovskite solar cell time-resolved photoluminescence genetic algorithm trap density methylammonium lead triiodide 

分 类 号：TM914.4[电气工程—电力电子与电力传动]