Modulating CsPbl_(3)crystallization by using diammonium agent for efficient solar cells

作     者：Junming Qiu Qisen Zhou Mei Yu Jianhua Liu Rongshan Zhuang Yong Hua Liming Ding Xiaoliang Zhang 

作者机构：School of Materials Science and EngineeringBeihang UniversityBeijingChina Yunnan Key Laboratory for Micro/Nano Materials&TechnologySchool of Materials and EnergyYunnan UniversityKunmingChina National Center for Nanoscience and TechnologyBeijingChina 

出 版 物：《SusMat》 (可持续发展材料（英文）)

年 卷 期：2023年第3卷第6期

页      面：894-908页

核心收录：

学科分类：07[理学] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：National Key Research and Development Program of China,Grant/Award Number:2022YFB3807200 National Natural Science Foundation of China,Grant/Award Numbers:52372169,51872014 Recruitment Program of Global Experts,and the“111”project,Grant/Award Number:B17002。 

主　　题：crystallization modulation CsPbI_(3) diammonium salt optoelectronic property perovskite solar cells 

摘      要：Cesium lead triiodide(CsPbI_(3))perovskite receives tremendous attention for photovoltaic applications,owing to its remarkable thermal stability and optoelectronic properties.However,realizing the CsPbI_(3)perovskite with high black-phase stability and optoelectronic properties remains a significant challenge,which largely affects the photovoltaic performance of perovskite solar cells(PSCs).Herein,aromatic ammonium agents are used to modulate the crystallization of the CsPbI_(3)perovskite to improve its black-phase stability and optoelectronic properties for efficient PSCs.Systemically experimental studies and comprehensively theoretical calculations are performed,which reveal that histammonium dihydrochloride(HACl_(2))could strongly couple with the perovskite during its crystallization,leading to faster nucleation and slower perovskite growth,and thus modulating the crystallization dynamics of the perovskites.Moreover,the residual diammonium cations(HA^(2+))distributed at the grain boundaries and on the surface of the perovskites can effectively passivate defects through electrostatic interactions,substantially suppressing trap-assisted nonradiative recombination,and prompting more matched perovskite surface energetics.Consequently,the photovoltaic performance of CsPbI_(3)PSCs is largely improved because of a combination of enhanced crystallinity and optoelectronic properties of the perovskites.This work offers a new avenue to prepare inorganic perovskites with high optoelectronic properties for photovoltaics.