Journal
MATTER
Volume 5, Issue 7, Pages 2209-2224Publisher
CELL PRESS
DOI: 10.1016/j.matt.2022.04.006
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Funding
- National Key Research and Development Program of China [2017YFE0131900]
- National Natural Science Foundation of China [91833306, 62075094, 52003118, 22105100]
- Natural Science Founda- tion of Jiangsu Province [BK20211537, BK20180339]
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We propose an ion-pairing passivating agent that can convert the surface of perovskite solar cells into water-resistant compositions. This agent reduces defect density and improves photovoltage and efficiency. Additionally, it has waterproof features that significantly enhance the stability of the device.
Either cationic ammonium or anionic pseudohalide compounds can passivate partial defects in perovskite solar cells (PSCs); however, their ion-pairing combination has rarely been studied because of its rarity. We present an ion-pairing passivating agent, diethylammonium diethyldithiocarbamate, synchronously providing both cationic and anionic ions, which can convert the surfaces of lead halide perovskite into two types of water-resistant compositions by forming strong chemical bonds. These synergistic capping compositions also reduce the defect density in the surface and bulk domains by passivating defect-nucleating sites, which can modify the surface energy level toward boosted photovoltage to 1.122 V and efficiency to 23.21% for pure-phase FAPbI(3) PSCs. In addition, their water-resistant features can effectively prevent moisture damage into the perovskite layer and significantly elongate device stabilities.
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