Fig. 4From: High-Hole-Mobility Metal–Organic Framework as Dopant-Free Hole Transport Layer for Perovskite Solar CellsMorphology characterization of perovskite films deposition on different thicknesses of Ni3(HITP)2 films. a–d 20 nm, 30 nm, 40 nm, and 50 nm, respectivelyBack to article page