Fig. 2From: High-Performance Quasi-2D Perovskite Light-Emitting Diodes Via Poly(vinylpyrrolidone) TreatmentSEM images of perovskite films with a pure PPA2(CsPbBr3)2PbBr4 and PVP-treated perovskite with concentration of b 2 mg/mL, c 3 mg/mL, and d 4 mg/mLBack to article page