Buried interface bridging for inverted cesium-formamidinium triiodide perovskite solar cells with long operational stability  

作　　者：Chenhui Zhang Chunjun Liang Fulin Sun Ting Zhu Xinghai Huang Yuzhu Guo Xinyu Guo Kunyang Ge Dan Li Fangtian You Zhiqun He 

机构地区：[1]Key Laboratory of Luminescence and Optical Information,Ministry of Education,Institute of Optoelectronic Technology,Beijing Jiaotong University,Beijing 100044,China [2]Department of Physics,School of Physical Science and Engineering,Beijing Jiaotong University,Beijing 100044,China

出　　处：《Science China Chemistry》2025年第1期163-173,共11页中国科学(化学英文版)

基　　金：supported by the Fundamental Research Funds for the Central Universities(2024YJS192);the National Natural Science Foundation of China(62174011)。

摘　　要：In the field of perovskite solar cells(PSCs),the research on defects in the buried interface has been relatively limited due to its non-exposure;however,this interface significantly impacts the performance enhancement of inverted PSCs.This study employs phenylethylammonium chloride(PEACl)molecules as a buffer layer to modify the buried interface of p-i-n structured PSCs,aiming to enhance the uniformity of self-assembled monolayers(SAMs)and facilitate the uniform nucleation and growth of perovskite films on the substrate.Furthermore,the introduction of the PEACl buffer layer effectively passivates defects at the bottom of the perovskite layer and notably enhances the crystal quality of the perovskite film by mitigating residual stress,thereby reducing nonradiative recombination loss.Following these optimizations,the MA-free PSCs treated with PEACl achieve a power conversion efficiency(PCE)of 24.11%,with significant improvements in storage,thermal stability,and operational stability.Particularly noteworthy is the device's performance in an unencapsulated state,whereas after 1,500 hours of continuous light operation stability testing,it retains 97%of its original efficiency.This study not only enriches the systematic understanding of the characteristics of the buried interface in PSCs but also contributes significantly to advancing the commercial production of perovskite photovoltaic technology.

关 键 词：defect-induced recombination buried interfaces inverted perovskite solar cells crystallization lattice mismatch 

分 类 号：O61[理学—无机化学]