|Cite this article as:|
|Jiuyao Du, Mengqi Zhang, and Jianjun Tian, Controlled crystal orientation of two-dimensional Ruddlesden-Popper halide perovskite films for solar cells, Int. J. Miner. Metall. Mater.,(2021). https://doi.org/10.1007/s12613-021-2341-z|
Metal halide perovskite solar cells have caused great attention due to their high power conversion efficiency (PCE) and cost-effective solution-processable fabrication, but suffer from poor structure stability. Two-dimensional (2D) Ruddlesden-Popper (RP) metal halide perovskites could address the above issue and possess excellent stability because of the large organic spacer cation around the halide octahedron of perovskites. However, the crystallographic orientation of 2D crystals should be perpendicular to the bottom substrates for realizing fast charge transport and collection of the solar cells. It is still a great challenge to control the crystallographic orientation of the 2D RP perovskites prepared by the solution process. Herein, we reviewed the recent progress of the 2D RP perovskite films with the focus on the crystallographic orientation mechanism and orientation controlling methods. Furthermore, the current issues and prospects of the 2D RP perovskites in the photovoltaic field were also discussed, aiming to shed light on developing and widely applying them in the near future.