YI Lin-kai, HUANG Jia-lin, ZHOU Mei etc. Spectral Response and Dark Current of p-i-n Type and Schottky Barrier GaN-based Ultraviolet Detectors[J]. Chinese Journal of Luminescence, 2017,38(10): 1327-1331
YI Lin-kai, HUANG Jia-lin, ZHOU Mei etc. Spectral Response and Dark Current of p-i-n Type and Schottky Barrier GaN-based Ultraviolet Detectors[J]. Chinese Journal of Luminescence, 2017,38(10): 1327-1331 DOI: 10.3788/fgxb20173810.1327.
Spectral Response and Dark Current of p-i-n Type and Schottky Barrier GaN-based Ultraviolet Detectors
The spectral response and dark current of p-i-n type and Schottky barrier GaN-based ultraviolet detectors are investigated. It is found that the responsivity of p-i-n detectors decreases with increasing thickness of p-GaN layer in p-i-n structure detectors
and the downward trend of responsivity is more pronounced at shorter wavelength of incident light. The responsivity of the Schottky barrier detector is obviously higher than that of the p-i-n structure
mainly because a lot of incident photons are absorpted in the p-GaN layer. The dark current of Schottky barrier ultraviolet detectors is far larger than the p-i-n ultraviolet detectors
and the results are basically consistent with the simulations
mainly because the Schottky detectors are majority carrier devices
and p-i-n detectors are minority carrier devices. To fabricate high performance GaN ultraviolet detectors
it is better to employ p-i-n structure with very thin p-GaN layer.
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references
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