钙钛矿(结构)
光伏系统
材料科学
碘化物
图层(电子)
化学工程
离域电子
化学键
能量转换效率
光电子学
复合材料
无机化学
化学
有机化学
生物
工程类
生态学
作者
Jeonghyeon Kim,Seul-Gi Kim,Nam‐Gyu Park
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2021-09-07
卷期号:6 (10): 3435-3442
被引量:34
标识
DOI:10.1021/acsenergylett.1c01376
摘要
We report here on the effect of chemical bonding nature of post-treatment materials on photovoltaic performance in perovskite solar cells using pyridinium iodide (PyI) with delocalized π electrons and piperidinium iodide (PpI) without a π bond. A gradual increase in power conversion efficiency (PCE) from 20.13% to 22.26% is observed as the PyI concentration increases from 0 to 40 mM, while PCE is optimized at relatively low concentration of 5 mM for PpI. It is found that a PyI layer is formed at the perovskite/HTL interface by the PyI treatment, which is beneficial for hole extraction even at increased interlayer thickness. On the other hand, an insulating 1-D PpPbI3 formed by PpI treatment blocks charge separation, which is pronounced at high concentration. Our comprehensive comparative work on post-treatment materials delivers a message that different thicknesses for each material are required to achieve decent photovoltaic parameters.
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