Fig. 33. Top-view scanning electron microscopy of (A) tetracene (Tc) single coat, (B) perovskite (Pk), (C) perovskite–tetracene (Pk–Tc), and (D) perovskite–tetracene–Spiro (Pk–Tc–Spiro) layers at three diverse magnifications (reproduced with permission from ref. 236. Copyright 2019 AAAS).