130 °C CH 3 NH 3 I treatment temperature in vapor-assisted solution process for large grain and full-coverage perovskite thin films

Abstract In this paper, the self-made setup with excellent controllability and general applicability was developed for the preparation of perovskite thin films using vapor-assisted solution process. The CH3NH3I treatment temperature was 130 °C, 140 °C, 150 °C in vapor-assisted solution process, the grain size of the corresponding perovskite thin films was ∼600 nm, ∼400 nm, ∼200 nm, and the best photoelectric conversion efficiency of the corresponding perovskite solar cells was 12.62%, 11.72% and 11.50%, respectively. The result demonstrated that the CH3NH3I treatment temperature can be decreased from 150 °C to 130 °C and the large grain and full-coverage perovskite thin film was obtained using the self-made setup at the CH3NH3I treatment temperature of 130 °C in ambient atmosphere because the CH3NH3I treatment temperature was usually 150 °C.