Zirconium-Based Metal-Organic Framework as a Novel Interlayer Material for Efficient Perovskite Solar Cells

Abstract

Organic-inorganic hybrid halide perovskite solar cells (PeSCs) have risen as promising candidates for photovotaics due 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 is needed. Herein, we first reported the application of zirconium-based metal-organic frameworks (MOFs) as an interlayer for PeSCs which are porous coordination polymers exhibiting long-range ordered metal clusters connected with organic linkers. There are some of reports expecting that MOFs could be utilized to optoelectronics, but a few reports regarding to MOF-included optoelectronics have also appeared. By using the rapid self-assembly process between metal source and organic linker to build MOFs structures, brushing method from precursor solution under hot-substrate condition was employed to prepare the thin MOFs films, incorporated into p-i-n structured PeSCs. By this straightforward strategy, the transparent and thin MOF films were deposited, film development and properties were analyzed by various methods and found to be appropriate for charge injection and transfer between perovskite and MOF layer. This result indicates MOFs could be novel and good hole transport materials for PeSCs.