Incorporating Zirconium-Based Metal-Organic Framework as a Novel Hole Transport Material for Efficient Perovskite Solar Cells

Abstract

Organic-inorganic hybrid halide perovskite solar cells (PeSCs) have risen as promising candidates for photovotaics owing to their superior properties such as outstanding performance, low cost and facile processability from solution state. In order to obtain higher power conversion efficiency of PeSCs, the suitable engineering of charge transport layer as well as that of active layer should be considered. Here, we first reported the application of zirconium-based metal-organic frameworks (MOFs) as an interlayer for PeSCs. By using the rapid self-assembly process between metal source and organic linker to build MOFs structures, brush-coating method from precursor solution under hot-substrate condition was employed to build the thin MOFs films, incorporated into p-i-n structured PeSCs. By this straightforward strategy, the transparent and thin MOF films were obtained, film development and properties were characterized by various methods and found to be appropriate for charge injection and transfer between perovskite and MOF layer, achieving 10.14 % power conversion efficiency for PeSCs. This result indicates that MOFs could be novel and good hole transport materials for PeSCs.