High responsivity ultraviolet detector based on novel SnO 2 nanoarrays.

In this work, tin oxide (SnO 2 ) nanoarrays (NAs) with a novel morphology were fabricated by a hydrothermal method. Each SnO 2 nanorod (NR) consisted of a bunch of nearly ten primary NRs with a width of 4-7 nm. On this basis, gold (Au) nanoparticles (NPs) were used to induce the growth of smaller and more orderly SnO 2 NAs. The prepared ultraviolet (UV) detectors based on SnO 2 NAs have high responsivity and high external quantum efficiency (EQE) under 20 μW cm -2 UV light with only 1 V external bias voltage.