Germanane and (3-Hydroxypropyl)germanane as Single Crystal Photodetectors

摘要

2D materials are being widely investigated for their potential application inlight-detecting devices. Very recently, a spin-coated flexible 2Dgermanium-based photodetector with great photocurrent density andresponsivity as well as short rise and decay time is presented by Liu et. al. Inthis paper, the solid-state single flake photodetector base on either puregermanane or (3-hydroxypropyl)germanane is reported. Both preparedphotodetectors while irradiated with different wavelengths of lightexhibit outstanding responsivity of 1157 mA W~(?1) for GeH and 362 mA W~(?1)for (3-hydroxypropyl)germanane, which exceeds Liu’s flexible reported GeHphotodetector (22 μA W~(?1)) by more than five orders of magnitude. Theseconstructed photodetectors also exhibit rise and fall times lower than 20 ms,which is also significantly faster than the GeH photodetector reported by Liuwith rise and decay times 240 and 740 ms, respectively.