Abstract
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 FAPbI3 PSCs. In addition, their water-resistant features can effectively prevent moisture damage into the perovskite layer and significantly elongate device stabilities.
Original language | English |
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Pages (from-to) | 2209-2224 |
Number of pages | 16 |
Journal | Matter |
Volume | 5 |
Issue number | 7 |
DOIs | |
State | Published - 6 Jul 2022 |
Keywords
- FAPbI perovskite
- MAP3: Understanding
- anionic diethyldithiocarbamate
- cationic diethylammonium
- ion-pairing passivator
- synergistic passivating