The investigation of quantum efficiency constituents of InAs/AlSb/GaSb based N structure type-II SL photodetectors with InAlAs interface

KILIÇ A. Y., TANSEL T., HOŞTUT M., ELAGÖZ S., ERGÜN Y.

SEMICONDUCTOR SCIENCE AND TECHNOLOGY, vol.33, no.9, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 33 Issue: 9
  • Publication Date: 2018
  • Doi Number: 10.1088/1361-6641/aad264
  • Journal Name: SEMICONDUCTOR SCIENCE AND TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: type-II SL, photodetectors, N-structure, high quantum efficiency, SUPERLATTICE PHOTODIODES, MID-WAVE
  • Middle East Technical University Affiliated: No

Abstract

We report on the optical properties of InAs/AlSb/GaSb based Type-II superlattice N-structure with p on n configuration. The detector structure is designed to operate in the mid wavelength infrared range with 50% cut-off wavelength of 4.88 mu m at 79 K. Electronic properties of N-structure such as heavy hole-light hole splitting energies are optimized by a first principles approach taking into account InAlAs interface bonding between InAs/AlSb layers. A responsivity of 1.13 A/Wat 3.2 mu m was measured under zero bias, with a corresponding quantum efficiency of 44%. An analytical model was developed in order to identify the contribution of quantum efficiency (QE) constituents. The overall QE contains a 56% contribution from the quasi-neutral p-region, 36% from the quasi-neutral n-region and 8% from the depletion region.