Impact of strain relaxation on performance of α-formamidinium lead iodide perovskite solar cells

被引：1136
作者：
Kim, Gwisu [1 ]
Min, Hanul [1 ]
Lee, Kyoung Su [1 ]
Lee, Do Yoon [1 ]
Yoon, So Me [1 ]
Seok, Sang Il [1 ]
机构：
[1] Ulsan Natl Inst Sci & Technol, Sch Energy & Chem Engn, Dept Energy Engn, 50 UNIST Gil, Ulsan 44919, South Korea
来源：
SCIENCE | 2020年 / 370卷 / 6512期
基金：
新加坡国家研究基金会;
关键词：
OPEN-CIRCUIT VOLTAGE; EFFICIENT; STABILITY; CATIONS; STABILIZATION; PHOTOVOLTAICS; TIN;
D O I：
10.1126/science.abc4417
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
High-efficiency lead halide perovskite solar cells (PSCs) have been fabricated with alpha-phase formamidinium lead iodide (FAPbI(3)) 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 FAPbI(3) 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 degrees C.
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页码：108 / +
页数：21
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