A fast chemical approach towards Sb2S3 film with a large grain size for high-performance planar heterojunction solar cells.

A facile chemical method is developed for the fabrication of Sb2S3 film with a lateral grain size as large as ∼12 μm. A solar cell based on this Sb2S3 film achieves a power conversion efficiency of 4.3%, which is the highest value in solution processed planar heterojunction solar cells based on Sb2S3 film.