4.2.3. Preparation of PCBM-perovskite precursor solution
The perovskite solution was created by mixing MAI and lead (II) iodide
in a 3:1 molar ratio, 45 wt% with DMF. The perovskite-PCBM layer was
prepared by dissolving PCBM (99.5%, Nano-C) into chlorobenzene, then
mixing the solution with the perovskite precursor solution.