甲脒
钙钛矿(结构)
卤化物
碘化物
铯
带隙
材料科学
能量转换效率
碘
化学
分析化学(期刊)
光电子学
无机化学
结晶学
色谱法
冶金
作者
Gwisu Kim,Hanul Min,Kyoung Su Lee,Do Yoon Lee,So Me Yoon,Sang Il Seok
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2020-10-02
卷期号:370 (6512): 108-112
被引量:1011
标识
DOI:10.1126/science.abc4417
摘要
High-efficiency lead halide perovskite solar cells (PSCs) have been fabricated with α-phase formamidinium lead iodide (FAPbI3) stabilized with multiple cations. The alloyed cations greatly affect the bandgap, carrier dynamics, and stability, as well as lattice strain that creates unwanted carrier trap sites. We substituted cesium (Cs) and methylenediammonium (MDA) cations in FA sites of FAPbI3 and found that 0.03 mol fraction of both MDA and Cs cations lowered lattice strain, which increased carrier lifetime and reduced Urbach energy and defect concentration. The best-performing PSC exhibited power conversion efficiency >25% under 100 milliwatt per square centimeter AM 1.5G illumination (24.4% certified efficiency). Unencapsulated devices maintained >80% of their initial efficiency after 1300 hours in the dark at 85°C.
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