期刊
ACS ENERGY LETTERS
卷 5, 期 8, 页码 2560-2568出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c01350
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资金
- U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) under Solar Energy Technologies Office [DE-EE0008753]
- National Science Foundation [DMR-1807818, 1534686]
- U.S. Air Force Research Laboratory [FA9453-18-2-0037, FA9453-19-C-1002]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1534686] Funding Source: National Science Foundation
Surface treatment using large alkyl/aryl ammonium cations has demonstrated reduced open-circuit voltage (V-OC) deficits in perovskite solar cells (PSCs), but the origin of the improvements has been vaguely attributed to defect passivation. Here, we combine microscopic probing of the local electrical properties, thermal admittance spectroscopic analysis, and first-principles calculations to elucidate the critical role of arylammonium interface layers in suppressing ion migration in wide-bandgap (WBG) PSCs. Our results reveal that arylammonium surface treatment using phenethylammonium iodide increases the activation energy barrier for ion migration on the surface, which suppresses the accumulation of charge defects at surface and grain boundaries, leading to a reduced dark saturation current density in WBG PSCs. With device optimization, our champion 1.73 eV PSC delivers a power conversion efficiency of 19.07% with a V-OC of 1.25 V, achieving a V-OC deficit of 0.48 V.
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