Monodispersed hierarchical ZnGa2O4 microflowers for self-powered solar-blind detection

Abstract

In this work, we successfully synthesized ZnGa₂O₄ microflowers self-assembled by hexagonal single-crystalline nanopetals in a water/ethanol solution through a novel solvothermal route. The self-assembled ZnGa₂O₄ microflower crystal exhibits improved solar-blind deep ultraviolet detection performance such as short response time, large light to dark current ratio, high photocurrent stability, and good wavelength selectivity under zero bias voltage, with the aid of the formation of heterojunctions with polyvinyl butyral. Our result is not only the best for self-powered solar-blind photodetect devices to date, but also the first report describing the effect of polymer concentrations on photoresponses.