Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10411748 | Solid-State Electronics | 2005 | 6 Pages |
Abstract
Al0.38Ga0.62N/GaN heterojunction solar-blind Schottky photodetectors with low dark current, high responsivity, and fast pulse response were demonstrated. A five-step microwave compatible fabrication process was utilized to fabricate the devices. The solar-blind detectors displayed extremely low dark current values: 30 μm diameter devices exhibited leakage current below 3 fA under reverse bias up to 12 V. True solar-blind operation was ensured with a sharp cut-off around 266 nm. Peak responsivity of 147 mA/W was measured at 256 nm under 20 V reverse bias. A visible rejection more than 4 orders of magnitude was achieved. The thermally-limited detectivity of the devices was calculated as 1.8 Ã 1013 cm Hz1/2 Wâ1. Temporal pulse response measurements of the solar-blind detectors resulted in fast pulses with high 3-dB bandwidths. The best devices had 53 ps pulse-width and 4.1 GHz bandwidth. A bandwidth-efficiency product of 2.9 GHz was achieved with the AlGaN Schottky photodiodes.
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Engineering
Electrical and Electronic Engineering
Authors
T. Tut, N. Biyikli, I. Kimukin, T. Kartaloglu, O. Aytur, M.S. Unlu, E. Ozbay,