摘要
有机无机杂化钙钛矿太阳能电池因其可调节的带隙、高吸收系数、宽吸收光谱、高载流子迁移率和长电荷扩散长度而被公认为是光伏领域的新希望。然而,采用一步溶液法所制备CH3 NH3 PbI3光吸收层薄膜为树枝状结晶,膜层覆盖率低,大大限制了光电转换效率的进一步提升。本文将氮气引入一步溶液法,通过发挥辅助结晶作用,获得了晶粒均匀且致密的钙钛矿薄膜,并显著提高了钙钛矿太阳能电池的光电转换效率。此外,系统研究了氮气起始时间、气体压强等因素对钙钛矿光吸收层表面形貌及太阳能电池光电转换效率的影响,实验证明氮气起始时间在2~5 s,氮气压强在0.4~0.8 MPa的宽操作窗口范围内,均可制备高质量CH3 NH3 PbI3光吸收层薄膜。
The perovskite solar cells(PSCs)is recognized as a promising candidate for energy industry system because of its tunable band-gap,high absorption coefficient,broad absorption spectrum,high charge carrier mobility and long charge diffusion lengths.However,the dendritic grains morphology,which caused by the traditional spin one-step solution coating procedure,usually resulted in poor coverage and low power conversion efficiency.In this work,a novel and facile nitrogen-assisted method was proposed to obtain uniform and dense perovskite thin films.Typically,the power conversion efficiency(PCE)of the nitrogen gas assisted perovskite solar cells is increased from 0.3%to around 10%.Furthermore,the influence of the start time and pressure of the nitrogen flow on the morphology of the perovskite active layer and PCE of the PSCs were investigated.Such strategy is proved to be an effective way to fabricate high quality perovskite films.
作者
于淼
黄小娜
邵俊泽
张万里
YU Miao;HUANG Xiaona;SHAO Junze;ZHANG Wanli(State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China,Chengdu 611731,China;Chengdu Technological University,Chengdu 611730,China)
出处
《电子元件与材料》
CAS
CSCD
北大核心
2020年第4期23-28,共6页
Electronic Components And Materials
基金
国家自然科学基金(51972041)
中央高校基本科研业务费(Y0301902300100112)。
关键词
钙钛矿太阳能电池
氮气
一步溶液法
形貌
起始时间
压强
perovskite solar cells
nitrogen
one-step solution coating procedure
morphology
start time
pressure
