Effects of guanidinium cations on structural,optoelectronic and photovoltaic properties of perovskites  

作　　者：Yi Ding Yan Wu Ying Tian Yuzeng Xu Minna Hou Bo Zhou Jingshan Luo Guofu Hou Ying Zhao Xiaodan Zhang 

机构地区：[1]Institute of Photoelectronic Thin Film Devices and Technolog,Key Laboratory of Photoelectronic Thin Film Devices and Technology(Tianjin),Engineering Research Center of Thin Film Photoelectronic Technology(Ministry of Education),Renewable Energy Conversion and Storage Center,Nankai University,Tianjin 300072,China [2]Institute of Modern Physics,Shaanxi Key Laboratory for Theoretical Physics Frontiers,Northwest University,Xi’an 710069,Shaanxi,China

出　　处：《Journal of Energy Chemistry》2021年第7期48-54,共7页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(61874061,61674084 and 61974074);National Key Research and Development Program of China(Grant No.2018YFB1500103);the 111 Project(B16027)。

摘　　要：Guanidinium(GA)cations are intentionally introduced in MAPbI_(3) perovskite by considering its potential capability of stabilizing the material through plenty of hydrogen bonds and mitigating hysteresis because of the zero dipole moment.The configurations of GA cation in film and its effects on structural,optoelectronic and photovoltaic properties of perovskite have been comprehensively studied by systematically modulating the GA ratio.It has been demonstrated that moderate GA cations can effectively passivate the defect surrounding perovskite grains,yielding an enhanced efficiency as high as~19,2%in a p-i-n type planar solar cells with the GA ratio of 15%.Further increasing the GA ratio deteriorates device performance,as extra GA cations hinder grain growth and thus reduce the grain size,which facilitates the defect generation around the enhanced interface.Moreover,a new two-dimensional(2 D)layered perovskite phase that features alternating GA and MA cations in the interlayer space(ACI)appears ultimately,while the ACI phase typically suffers from slow charge transportation across the parallel PbI2 octahedral layers separated by large A-site cations.

关 键 词：Perovskite solar cell GUANIDINIUM DFT calculations 2D perovskite Phase separation 

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]