Selection of a Suitable Solvent Additive for 2-Methoxyethanol-Based Antisolvent-Free Perovskite Film Fabrication

Sung Hun Lee; Seungyeon Hong; Hyo Jung Kim

doi:10.1021/acsami.2c10171

Selection of a Suitable Solvent Additive for 2-Methoxyethanol-Based Antisolvent-Free Perovskite Film Fabrication

ACS Appl Mater Interfaces. 2022 Aug 31;14(34):39132-39140. doi: 10.1021/acsami.2c10171. Epub 2022 Aug 16.

Authors

Sung Hun Lee¹, Seungyeon Hong¹, Hyo Jung Kim¹

Affiliation

¹ Department of Organic Material Science and Engineering, School of Chemical Engineering, Pusan National University, Busan 46241, Republic of Korea.

PMID: 35972901
DOI: 10.1021/acsami.2c10171

Abstract

In this study, we compare various solvents with different Gutmann donor numbers as additives to improve the quality of perovskite films via an antisolvent-free process, using 2-methoxyethanol (2MOE) as the solvent. In 2MOE-based solutions, we found that the higher the donor number of the solvent, the lower the amount of the solvent required to form insoluble adducts. Furthermore, we found that N-methyl-2-pyrrolidone (NMP), which has a relatively low donor number and vapor pressure, can be added without a limitation to precipitation, while the degree of the intermediate phase in the as-deposited film is controlled by the amount of NMP added. We obtained pinhole-free and planar perovskite films by optimizing the amount of NMP added and fabricated devices based on NMP-assisted MAPbI₃ and MAPbI_3-xCl_x films, with efficiencies of 18.80 and 20.39%, respectively.

Keywords: additive; antisolvent-free; donor number; organic−inorganic hybrid perovskites; solvent engineering.