Fig. 9: Structure and performance of an AlGaN solar-blind photoconductor.
From: Progress on AlGaN-based solar-blind ultraviolet photodetectors and focal plane arrays
a Schematic structure of AlGaN photodetector. b Spectral responsivity of the AlGaN detector at back-illumination under 5 V bias. The insert illustrates the photocurrent resonance peak, measured at 5 V (curve 1), 12 V (curve 2), and 15 V (curve 3), respectively. c Spectral responsivity versus applied voltage (hν ~ 4.8 eV). The inset presents the dark current. Vopt is the trap-free point (6 V). d Time response (hν ~ 4.8 eV) at 5 V (dark circles) and 15 V (green triangles). e Time response at 5 V (trap-free regime) with 4.8 eV photon (squares) and 3.8 eV photon (triangles). f Time constant versus photon energy at 5 V. Reprinted with permission from Cherkashinin et al.55. Copyright 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
