High-Performance Large-Area Perovskite Solar Cells Enabled by Confined Space Sublimation

作者：Leilei Gu, Shubo Wang, Xiang Fang, Di Liu, Yibo Xu, Ningyi Yuan, Jianning Ding · 发表于：ACS Applied Materials & Interfaces · 年份：2020 · DOI：10.1021/acsami.0c10830 · 被引用次数：25 · 研究领域：Perovskite Materials and Applications、Chalcogenide Semiconductor Thin Films、Conducting polymers and applications

Large-area devices with high power-conversion efficiency (PCE) are required for the further development of perovskite solar cells (PSCs). However, the major obstacle restricting the commercialization of large-area PSCs is the lack of reliable deposition technology for scalable perovskite thin films. Herein, a confined space sublimation method compatible with the preparation of a large-area perovskite film is introduced. First, pure PbX 2 (X is I, Br, and Cl) films are exposed to CH 3 NH 3 I vapor, and the gas–solid reaction mechanisms for different lead halide layers are investigated; the perovskite films fabricated by retarded displacement between multiple halogens show large grains and a controllable band gap. Then, through mixed halogen adjustments of the PbX 2 film, a maximum PCE of 20.44% (0.07 cm 2 ) for high-efficiency PSCs with large grains (over 2.0 μm) is obtained, while the fabrication of wide-band gap PSCs with a champion PCE of 17.99% (0.07 cm 2 ) verified the band gap-controlled compatibility of the confined space sublimation approach. Furthermore, the confined space sublimation approach is applied to fabricate large-area (6.75 cm 2 ) devices with uniform photovoltaic performance, demonstrating the scalable potential of this approach.