Methylamine Induced Defect-Healing and Cationic Substitution: A New Method for Low-Defect Perovskite Thin Films and Solar Cells
The power conversion efficiency of perovskite solar cells has been recently increased from 3.81% to 24.2%, still lagging behind the Shockley-Queisser limit with an ideal value of 33%. It has been widely recognized that the effective defect passivation of the perovskite film is crucial for further efficiency boost. Here we systematically summarized and reviewed the development, recent advances and commercial application of methylamine (CH3NH2, MA) induced defect-healing (MIDH) method, from the principle of defect passivation and moisture stability. MA gas can recrystallize perovskite and form dense films with higher crystallinity and fewer defects, which can improve carrier lifetime, carrier diffusion length, and moisture stability. Moreover, this MIDH technique has been successfully implemented in scalable perovskite module deposition process and recycling process, enabling the large scale fabrication of high quality perovskite films with lower trap states density. Last, the perspective of this promising technique and some remaining open questions for the mature of this method toward future upscaling manufacturing high quality perovskite thin films and related optoelectronics devices are proposed.
- This article is part of the themed collection: 2019 Journal of Materials Chemistry C HOT Papers