光致发光
氧气
材料科学
光伏系统
扩散
制作
钙钛矿(结构)
拉曼散射
太阳能电池
光电子学
拉曼光谱
化学
光学
热力学
结晶学
电气工程
医学
物理
替代医学
有机化学
病理
工程类
作者
Shuai Yuan,Zhiwen Qiu,Hailiang Zhang,Haibo Gong,Yufeng Hao,Bingqiang Cao
摘要
During the growth of CH3NH3PbI3−xClx (MAPbI3−xClx) perovskite films by the two-step inter-diffusion method, the presence of a trace amount of oxygen gas is critical to their physical properties and photovoltaic performance. As the oxygen concentration increases, poor film morphologies and incomplete surface coverage are observed. Moreover, by XRD, Raman scattering, and photoluminescence measurements, we find that MAPbI3−xClx grains become more distorted and the electron-hole recombination rate dramatically increases. Higher oxygen concentration triggers a sharp decrease in the current density and the fill factor of corresponding solar cells, which degrades device performance, on average, from 14.3% to 4.4%. This work proves the importance of controlling the oxygen atmosphere in the fabrication of high-performance perovskite solar cells.
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