The perovskite layer is the most crucial factor for the high performance tin-based perovskite. Herein, we investigate the effect of solvent on the morphology of perovskite films systematically. Dimethyl sulfoxide (DMSO)has been adopted as a high boiling point combined with the commonly used N,N-dimethylformamide (DMF)to control the rapid nucleation and retarding crystal growth. A pinhole-free MASnI3 perovskite film with dense and large grains is obtained. By optimizing the solvent composition, multiple tin-based mixed iodine and bromine perovskite solar cells (MASn(I1−xBrx)3 0 ≤ x ≤ 1)were fabricated. The best photoconversion cell efficiency was obtained at x = 0.67, which yields to 3.20% compared to the original MASnI3 (1.17%)due to the benefit band level alignment. The conductivity and the stability of the MASn(I1−xBrx)3 perovskite device was carefully studied.
Bibliographical noteFunding Information:
This research was supported by a grant ( NRF-2018R1A2B2003607 ) under a basic science research program through the NRF funded by the Ministry of Science, Technology , and ICT, Republic of Korea . This research was also supported by the Basic Science Research Program through the NRF funded by the Ministry of Education ( NRF-2018R1A6A1A03025340 ). In addition, the work at Yonsei University was supported by NRF (NRF-2017R1A2B4002442) and the Graduate School of Yonsei University Research Scholarship Grants in 2018.
- Conductive atomic force microscopy
- Crystal growth
- Lead-free perovskite
- Solvent engineering