Low-frequency noise characterizations of GaN-based visible-blind UV detectors fabricated using a double buffer layer structure

H. F. Lui; W. K. Fong; C. Surya

doi:10.1117/12.724978

8 June 2007 Low-frequency noise characterizations of GaN-based visible-blind UV detectors fabricated using a double buffer layer structure

H. F. Lui, W. K. Fong, C. Surya

Author Affiliations +

Proceedings Volume 6600, Noise and Fluctuations in Circuits, Devices, and Materials; 66000D (2007) https://doi.org/10.1117/12.724978
Event: SPIE Fourth International Symposium on Fluctuations and Noise, 2007, Florence, Italy

Abstract

In this paper we report systematic reliability studies of GaN UV detectors exposed to high power UV radiation. GaN epitaxial layers are deposited by rf plasma-assisted molecular beam epitaxy (MBE) utilizing a double buffer layer structure. Our studies show that the optimal buffer layer structure consists of a conventional AlN high-temperature buffer layer (HTBL) and an 800 nm thick GaN intermediate temperature buffer layer (ITBL) deposited at 690°C. Two types of devices are being investigated. Type I devices were fabricated on the optimal double buffer layer structure. Type II devices have only a conventional AlN buffer layer. Flicker noise measurement is used to monitor the degradation of the device due to optical stress. In addition, I-V and responsivity measurements were also performed. The experimental results are consistent with each other which show that the degradation of the devices arises from the generation of crystalline defects at the Schottky junction due to the exposure of the devices to the high power UV radiation. Both types of devices demonstrate degradation in their optoelectronic properties. However, while type I devices general exhibit gradual and slow degradations type II devices exhibit catastrophic breakdowns in the device characteristics. Our experimental data show that visible-blind UV detectors fabricated on the optimized double buffer layer structure indicate significant improvements in the radiation hardness of the devices.

Citation Download Citation

H. F. Lui, W. K. Fong, and C. Surya "Low-frequency noise characterizations of GaN-based visible-blind UV detectors fabricated using a double buffer layer structure", Proc. SPIE 6600, Noise and Fluctuations in Circuits, Devices, and Materials, 66000D (8 June 2007); https://doi.org/10.1117/12.724978

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KEYWORDS

Gallium nitride

Ultraviolet radiation

Ultraviolet detectors

Aluminum nitride

Optoelectronic devices

Optoelectronics

Crystals

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