File Name : fig.s1.tif

Caption : fig. s1. schematic diagram of devices with the structure of glass/ito/pedot:pss/perovskite/pc61bm/bcp/ag.

File Name : fig.s2.tif

Caption : fig. s2. dark j–v curves.

File Name : fig.s3.tif

Caption : fig. s3. uv-vis absorption characteristics of perovskite films prepared by different methods.

File Name : fig.s4.tif

Caption : fig. s4. optical images for perovskite crystalline growth with different time on 100℃ hot plate, (a) control; (b) dmso-assisted. uv-vis absorption spectra of perovskite films with time variation, (c) control, (d) dmso-assisted.

File Name : fig.s5.tif

Caption : fig. s5. optical images for perovskite crystalline growth with different time on 100℃ hot plate, (a) dmso-assisted; (b) control-8:2 (dmf:dmso); (c) control-7:3 (dmf:dmso); (d) control-5:5 (dmf:dmso).

File Name : fig.s6.tif

Caption : fig. s6. j-v curves of devices with different preparation methods, corresponding to figure s3.