甲脒
钙钛矿(结构)
退火(玻璃)
材料科学
碘化物
光电流
光伏系统
相(物质)
再现性
能量转换效率
分析化学(期刊)
产量(工程)
光电子学
化学工程
复合材料
化学
色谱法
无机化学
有机化学
生物
工程类
生态学
作者
Yong Zhang,Seongrok Seo,Soo Yeon Lim,Young-Hoon Kim,Seul-Gi Kim,Do Kyung Lee,Sun-Ho Lee,Hyunjung Shin,Hyeonsik Cheong,Nam‐Gyu Park
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2019-12-09
卷期号:5 (2): 360-366
被引量:138
标识
DOI:10.1021/acsenergylett.9b02348
摘要
The conventional precursor mixture based on highly pure and expensive PbI2 (purity >99.99%) is problematic in commercializing perovskite solar cells (PSCs) because of a large deviation in the batch-to-batch photovoltaic performance due to underlying nonstoichiometry and/or the nonperovskite phase. Here, we report on reproducibly efficient (>21%) PSCs based on the ambient-temperature-stable δ-phase FAPbI3 powder, synthesized by reacting PbI2 (either homemade or low-grade commercial product with purity <99%) with formamidinium iodide (FAI) at room temperature (∼93% yield). X-ray diffraction patterns confirm that annealing the spin-coated film leads to phase purity of cubic α FAPbI3. As compared to the conventional precursor mixture based on PbI2 (purity = 99.9985%), significantly reducing defects in the powder-based film is responsible for the stable and reproducible efficiency. In addition, the homogeneous light-intensity-dependent surface photocurrent contributes to the reproducibility of photovoltaic performance. The quasi-steady-state power conversion efficiency of 21.07% is certified for the device based on FAPbI3 powder.
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