1. Ionic Liquid Stabilized Perovskite Solar Modules with Power Conversion Efficiency Exceeding 20%.
- Author
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Wang, Yulong, Yang, Yufei, Li, Neng, Hu, Min, Raga, Sonia R., Jiang, Yang, Wang, Chao, Zhang, Xiao‐Li, Lira‐Cantu, Monica, Huang, Fuzhi, Cheng, Yi‐Bing, and Lu, Jianfeng
- Subjects
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SOLAR energy , *IONIC liquids , *PEROVSKITE , *IONIC structure , *SOLAR cells - Abstract
Metal‐halide perovskite solar cells (PSCs) exhibit outstanding power conversion efficiencies (PCEs) when fabricated as mm‐sized devices, but creation of high‐performing large‐area modules that are stable on a sufficiently long timescale still presents a significant challenge. Herein, the quality of large‐area perovskite film is improved by using ionic liquid additives via forming a new Pb‐N bonding between the ionic liquid and Pb2+. This new bond can be modulated by a critical screening of the anion structure of the ionic liquid. The selected ionic liquid effectively reduces the defects of the perovskite films and markedly elongate their carrier lifetimes. As a result, a champion PCE of 24.4% for small‐area (0.148 cm2) devices and 20.4% for larger‐area (10.0 cm2) modules under AM 1.5G irradiation is achieved. More importantly, the modified devices retain 90% of their peak PCE after aging for 1900 h at 65 ± 5 °C (ISOS‐T‐1) and 80% after continuous light soaking for 750 h. The non‐encapsulated modules maintained 80% of their peak PCE after 1100 h of aging in the air with a relative humidity of 35 ± 5% and temperature of 25 ± 5 °C under dark (ISOS‐D‐1), showing great potential for future commercialization. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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