期刊
NANO LETTERS
卷 20, 期 12, 页码 8880-8889出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03914
关键词
two-dimensional perovskite; crystal orientation; solvent-vapor annealing; solar cells
类别
资金
- U.S. DOE Office of Science Facilities, at Brookhaven National Laboratory [DE-SC0012704]
- Princeton Center for Complex Materials, a National Science Foundation (NSF)-MRSEC program [DMR-1420541]
- National Science Foundation [DMR-1420541, CMMI-1824674]
- U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) under Solar Energy Technologies Office (SETO) [DE-EE0008560]
Accessing vertical orientation of two-dimensional (2D) perovskite films is key to achieving high-performance solar cells with these materials. Herein, we report on solvent-vapor annealing (SVA) as a general postdeposition strategy to induce strong vertical orientation across broad classes of 2D perovskite films. We do not observe any local compositional drifts that would result in impure phases during SVA. Instead, our experiments point to solvent vapor plasticizing 2D perovskite 1 0 films and facilitating their surface-induced reorientation and concomitant grain growth, which enhance out-of-plane charge transport. Solar cells with SVA 2D perovskites exhibit superior efficiency and stability compared to their untreated analogs. With a certified efficiency of (18.00 +/- 0.30) %, our SVA (BDA)(Cs(0.1)FA(0.04)Pb(5)I(16) solar cell boasts the highest efficiency among all solar cells with 2D perovskites (n <= 5) reported so far.
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