材料科学
钙钛矿(结构)
理论(学习稳定性)
化学工程
钙钛矿太阳能电池
工程物理
光电子学
太阳能电池
纳米技术
计算机科学
机器学习
工程类
作者
Qiaohui Li,Liqun Zhou,Tianze Zhou
标识
DOI:10.1002/aenm.202400050
摘要
Abstract 2D Ruddlesden–Popper perovskites (RPP) with excellent environmental and structural stability are emerging photovoltaic materials. Here, a benzylamine‐based spacer, namely 3,5‐difluorobenzylamine (DF‐BZA), is developed for stable and efficient quasi‐2D‐RP perovskite solar cells (PSCs). Compared to benzylamine (BZA)‐based quasi‐2D RPP, the DF‐BZA‐based perovskite film exhibited superior film quality with significantly enlarged grain size and improved charge carrier lifetime owing to the fluorine atoms in DF‐BZA. As a result, the optimized (DF‐BZA) 2 FA 3 Pb 4 I 13 PSCs achieve a power conversion efficiency (PCE) of 19.24%, while BZA‐based PSCs ((BZA) 2 FA 3 Pb 4 I 13 ) only achieve a PCE of 17.04%. This represents the champion PCE using FA as the A‐site cation in quasi‐2D RPPs with n = 4. Moreover, due to the effective insertion of fluorinated spacers into the inorganic layers, the moisture resistance stability and 85 °C thermal stability of (DF‐BZA) 2 FA 3 Pb 4 I 13 are significantly improved. The improvement of photovoltaic performance and stability highlight the great potential of DF‐BZA‐based spacer for high‐performance quasi‐2D RP PSCs.
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