钙钛矿(结构)
材料科学
卤化物
化学工程
表面能
相(物质)
晶界
光伏
能量转换效率
化学
光电子学
微观结构
无机化学
光伏系统
复合材料
有机化学
工程类
生物
生态学
作者
Pramila Patil,Dilpreet Singh Mann,Sachin R. Rondiya,Nelson Y. Dzade,Sung Nam Kwon,Seok In Na
出处
期刊:Solar RRL
[Wiley]
日期:2021-09-16
卷期号:5 (11)
被引量:11
标识
DOI:10.1002/solr.202100547
摘要
Organic–inorganic lead halide perovskites (OIHPs) have emerged as promising materials for next‐generation photovoltaics. However, performance improvements in the perovskite‐based device are still limited due to defects that exist more intensively on the surface as well as grain boundaries (GBs) and mismatching energy levels at the interface. Herein, a reactive post‐treatment process (RPP) using guanidine acetate (GA) is adopted to address defects and interfacial energy level matching at the perovskite surface. The RPP with GA (GA‐RPP) results in the formation of an improved perovskite layer with large grain size and low GB density, leading to the formation of secondary phases on the perovskite surface with appropriate energy levels, resulting in reduced defect density and charge recombination. Furthermore, density functional theory analysis reveals that the Pb‐rich secondary phase could improve the conduction of electrons at the perovskite interface. Therefore, the GA‐RPP‐based perovskite‐based solar cell (PSC) shows enhanced performance with 20.4% efficiency and long‐term stability.
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