甲脒
碘化物
钙钛矿(结构)
三元运算
太阳能电池
能量转换效率
钙钛矿太阳能电池
化学
载流子
电子迁移率
材料科学
化学物理
无机化学
结晶学
光电子学
程序设计语言
计算机科学
作者
Eita Nakanishi,Ryosuke Nishikubo,Atsushi Wakamiya,Akinori Saeki
标识
DOI:10.1021/acs.jpclett.0c00686
摘要
Despite recent interest in lead-free Sn iodide perovskite (ASnI3) solar cells, the role of mixed A-site cations is yet to be fully understood. Here, we report the effect of the ternary mixing of organic A-site cations (guanidium, GA; formamidinium, FA; and phenylethylamine, PEA) on the solar cell performance and charge carrier dynamics that are evaluated using time-resolved microwave conductivity (TRMC). (GAxFA1–x)0.9PEA0.1SnI3 exhibits the maximum power conversion efficiency (PCE) of 7.90% at x = 0.15 and a drastic decrease with increasing GA content. Notably, our TRMC measurements of ASnI3 with/without a hole transport layer reveal the same trend with the devices. From the analyses, we suggest that a variation of electron mobility affected by the location of the GA cation in the grains significantly impacts the PCE. Our work sheds light on the role of mixed A-site cations and directs a route toward the further development of Sn perovskite solar cells.
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