Fig. 32. (a) Side view SEM image of the PSC fabricated using MLG/ZnO. (b) PCE curve with time under maximum power point tracking. (c) Stability test of PSCs based on ZnO, MLG/ZnO, and MLG/ZnO with passivation under constant illumination for 300 hours at room temperature and under nitrogen flow (reproduced with permission from ref. 235. Copyright 2019 RSC).