Electron transport materials based on ZnO@carbon derived metal-organic framework for high-performance perovskite solar cell

ZnO is widely known as an excellent electron-transport material for perovskite solar cells. MOF-derived ZnO is anticipated for use as ideal electron transport material due to its greater exciton binding energy, higher visible spectrum transmittance, and comparable energy level with perovskite can boost light harvesting and improve perovskite interfacial contact. Therefore, ZnO/C composites were successively prepared and well characterized. ZnO/C materials are characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), as well as by N₂ adsorption–desorption isotherm surface area. Compared to traditional ZnO nanoparticles, MOF-derived, carbon-doped ZnO/C attains more effective extracting electrons resulting in a much higher fill factor and short-circuit current density in the cells. The power conversion efficacy (PCE) of MOF-derived ZnO/C-based perovskite solar cells is 19.6 %, with a fill factor (FF) of 0.77. In addition, the hysteresis impact becomes almost nonexistent.