Fig. 1From: High-Hole-Mobility Metal–Organic Framework as Dopant-Free Hole Transport Layer for Perovskite Solar CellsCharacterization of the Ni3(HITP)2 film. a XRD pattern, b TEM micrograph; c XPS spectra of Ni 2p, and d thermogravimetric curve of the Ni3(HITP)2Back to article page