π-Conjugated Carbazole Cations Enable Wet-Stable Quasi-2D Perovskite Photovoltaics

作者：Jien Yang, Tingwei He, Meng Li, Guixiang Li, Hairui Liu, Jinjin Xu, Meng Zhang, Weiwei Zuo, Ruiping Qin, Mahmoud H. Aldamasy, Mingjian Yuan, Zhe Li, Mahdi Malekshahi Byranvand, Michael Saliba, Antonio Abate · 发表于：ACS Energy Letters · 年份：2022 · DOI：10.1021/acsenergylett.2c02219 · 被引用次数：41 · 研究领域：Perovskite Materials and Applications、Conducting polymers and applications、Coral and Marine Ecosystems Studies

Quasi-two-dimensional halide perovskites are commonly used in solar cells, as they are more stable than their three-dimensional analogues. Nevertheless, it is still challenging to meet the stability requirements under high-humidity conditions. Here, we design π-conjugated carbazole (CA) cations to increase the water resistance of perovskite. We control the crystallization kinetics by the anti-solvent strategy to locate the hydrophobic low-⟨ n ⟩-value phase on the surface of the perovskite film. The resulting CA 2 MA 4 Pb 5 I 16 film does not decompose after being immersed in water for several minutes. We further regulate the vertical orientation of perovskite crystals by introducing NH 4 SCN additive, resulting in improved carrier transport dynamics. As a result, the optimized CA 2 MA 4 Pb 5 I 16 device achieves a notable power conversion efficiency (PCE) of 18.23% and retains more than 85% of the original PCE after 2000 h under a relative humidity of 65% at 25 °C. This is one of the most stable reported unencapsulated perovskite solar cells in high-humidity environments.