Solar-blind imaging based on 2-inch polycrystalline diamond photodetector linear array

Diamond is a promising ultrawide-bandgap semiconductor, which has drawn much attention in deep-ultraviolet optoelectronics and high-power electronics, due to its unique properties, including the highest thermal conductivity, strong radiation resistance, high breakdown electric field, chemical and thermal stability, and high carrier mobility. However, the optoelectronics applications have been restricted greatly by the small growth size of the single-crystal diamond. In this work, we demonstrate a solar-blind photodetector linear array based on high-quality 2-inch polycrystalline diamond, which has the advantage of large-area growth. The photodetector cells exhibit good uniformity, a responsivity of 45 mA/W at 228 nm with a cut-off wavelength of 240 nm, and a short response time of <20 mu s. Clear solar-blind images are obtained by using the photodetector linear array as sensing units. The results reported in this work promise the potential applications of polycrystalline diamond in deep-ultraviolet photodetectors. (C) 2020 Elsevier Ltd. All rights reserved.

Automated summary

Diamond, as a promising ultrawide-bandgap semiconductor, has unique properties that make it suitable for deep-ultraviolet optoelectronics and high-power electronics applications. However, the small growth size of single-crystal diamond has limited its optoelectronics applications. In contrast, polycrystalline diamond, with the advantage of large-area growth, shows potential for use in solar-blind photodetectors with good responsivity and short response time.