Ultraviolet avalanche photodiodes

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

The III-Nitride material system is rapidly maturing; having proved itself as a material for LEDs and laser, and now finding use in the area of UV photodetectors. However, many UV applications are still dominated by the use of photomultiplier tubes (PMT). PMTs are capable of obtaining very high sensitivity using internal electron multiplication gain (typically ∼106). It is highly desirable to develop a compact semiconductor-based photodetector capable of realizing this level of sensitivity. In principle, this can be obtained in III-Nitrides by taking advantage of avalanche multiplication under high electric fields-Typically 2.7 MV/cm, which with proper design can correspond to an external reverse bias of less than 100 volts. In this talk, we review the current state-of-The-Art in III-Nitride solar-And visible-blind APDs, and present our latest results on GaN APDs grown on both conventional sapphire and low dislocation density free-standing c-And m-plane GaN substrates. Leakage current, gain, and single photon detection efficiency (SPDE) of these APDs were compared. The spectral response and Geiger-mode photon counting performance of UV APDs are studied under low photon fluxes, with single photon detection capabilities as much as 30% being demonstrated in smaller devices. Geiger-mode operation conditions are optimized for enhanced SPDE.

Original languageEnglish (US)
Title of host publicationOptical Sensing, Imaging, and Photon Counting
Subtitle of host publicationNanostructured Devices and Applications
PublisherSPIE
Volume9555
ISBN (Electronic)9781628417210
DOIs
StatePublished - Jan 1 2015
EventOptical Sensing, Imaging, and Photon Counting - San Diego, United States
Duration: Aug 11 2015Aug 13 2015

Other

OtherOptical Sensing, Imaging, and Photon Counting
CountryUnited States
CitySan Diego
Period8/11/158/13/15

Keywords

  • APD
  • Avalanche Photodiode
  • GaN
  • Geiger Mode
  • Single Photon Detection

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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