Fig. 10From: Methodologies for high efficiency perovskite solar cellsPlane-view and cross-sectional SEM images of FAPbI3 perovskite layers formed by adduct approach a, c without thiourea (only DMSO) and b, d with thiourea (20 % thiourea and 80 % DMSO). Reprinted with permission from Ref. [49]Back to article page