Showing papers by "Winston V. Schoenfeld published in 2022"
TL;DR: In this paper , the authors reported ultra-high responsivity of epitaxial Schottky UV-C photodetectors and experimentally identified the source of gain as deep-level defects, supported by first principles calculations.
Abstract: We report ultra-high responsivity of epitaxial [Formula: see text] (TGO) Schottky UV-C photodetectors and experimentally identified the source of gain as deep-level defects, supported by first principles calculations. Epitaxial TGO films were grown by plasma-assisted molecular beam epitaxy on (−201) oriented n-type β-[Formula: see text] substrates. Fabricated vertical Schottky devices exhibited peak responsivities as high as 3.5 [Formula: see text] A/W at −5 V applied bias under 250 nm illumination with sharp cutoff shorter than 280 nm and fast rise/fall time in milliseconds order. Hyperspectral imaging cathodoluminescence (CL) spectra were examined to find the mid-bandgap defects, the source of this high gain. Irrespective of different tin mole fractions, the TGO epilayer exhibited extra CL peaks at the green band (∼2.20 eV) not seen in β-[Formula: see text] along with enhancement of the blue emission-band (∼2.64 eV) and suppression of the UV emission-band. Based on hybrid functional calculations of the optical emission expected for defects involving Sn in β-[Formula: see text], VGa–Sn complexes are proposed as potential defect origins of the observed green and blue emission-bands. Such complexes behave as acceptors that can efficiently trap photogenerated holes and are predicted to be predominantly responsible for the ultra-high photoconductive gain in the Sn-alloyed [Formula: see text] devices by means of thermionic emission and electron tunneling. Regenerating the VGa–Sn defect complexes by optimizing the growth techniques, we have demonstrated a planar Schottky UV-C photodetector of the highest peak responsivity.
4 citations
30 Jan 2022
TL;DR: In this article , Qrona Technologies in collaboration with subcontractor research groups, at UCF and UM, fabricated both p-n-junction and MIS metaloxide-based photodetectors, by performing device modeling and simulation, thin-film epitaxy using MBE and MSE, and device processing and characterization.
Abstract: In this SBIR Phase I project, Qrona Technologies in collaboration with subcontractor research groups, at UCF and UM, fabricated both p-n-junction and MIS metal-oxide-based photodetectors, by performing device modeling and simulation, thin-film epitaxy using MBE and MSE, and device processing and characterization.