Accessing Highly Oriented Two-Dimensional Perovskite Films via Solvent-Vapor Annealing for Efficient and Stable Solar Cells
- 9 November 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 20 (12), 8880-8889
- https://doi.org/10.1021/acs.nanolett.0c03914
Abstract
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 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)(Cs0.1FA0.9)4Pb5I16 solar cell boasts the highest efficiency among all solar cells with 2D perovskites (n ≤ 5) reported so far.Keywords
Funding Information
- Office of Energy Efficiency and Renewable Energy (DE-EE0008560)
- Division of Civil, Mechanical and Manufacturing Innovation (CMMI-1824674)
- Division of Materials Research (DMR-1420541)
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