Fig. 29. (a) PCE distribution with precursor solution aging time (hours) of the triple-cation lead halide PSCs.223 (b) Photographs of triple-cation (FA, MA, Cs) films produced from fresh ink (viz., 0 days of storage, labeled as “Day 0”) and the same ink is utilized for the 2–81 days storage. (c) Snapshots of layers made up from 24 days old ink. (Reproduced with permission from ref. 224. Copyright 2020 ACS).
