Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Type-II superlattice-based extended short-wavelength infrared focal plane array with an AlAsSb/GaSb superlattice etch-stop layer to allow near-visible light detection

Not Accessible

Your library or personal account may give you access

Abstract

A versatile infrared imager capable of imaging the near-visible to the extended short-wavelength infrared (e-SWIR) is demonstrated using e-SWIR InAs/GaSb/AlSb type-II superlattice-based photodiodes. A bi-layer etch-stop scheme consisting of bulk InAs0.91Sb0.09 and AlAs0.1Sb0.9/GaSb superlattice layers is introduced for substrate removal from the hybridized back-side illuminated photodetectors. The implementation of this new technique on an e-SWIR focal plane array results in a significant enhancement in the external quantum efficiency (QE) in the 1.8–0.8 μm spectral region, while maintaining a high QE at wavelengths longer than 1.8 μm. Test pixels exhibit 100% cutoff wavelengths of 2.1 and 2.25μm at 150 and 300 K, respectively. They achieve saturated QE values of 56% and 68% at 150 and 300 K, respectively, under back-side illumination and without any anti-reflection coating. At 150 K, the photodetectors (27μm×27μm area) exhibit a dark current density of 4.7×107A/cm2 under a 50mV applied bias providing a specific detectivity of 1.77×1012cm·Hz1/2/W. At 300 K, the dark current density reaches 6.6×102A/cm2 under 50mV bias, providing a specific detectivity of 5.17×109cm·Hz1/2/W.

© 2017 Optical Society of America

Full Article  |  PDF Article
More Like This
nBn extended short-wavelength infrared focal plane array

Arash Dehzangi, Abbas Haddadi, Romain Chevallier, Yiyun Zhang, and Manijeh Razeghi
Opt. Lett. 43(3) 591-594 (2018)

High-performance infrared photodetectors based on InAs/InAsSb/AlAsSb superlattice for 3.5 µm cutoff wavelength spectra

Junkai Jiang, Guowei Wang, Donghai Wu, Yingqiang Xu, Faran Chang, Wenguang Zhou, Nong Li, Dongwei Jiang, Hongyue Hao, Suning Cui, Weiqiang Chen, Xueyue Xu, Haiqiao Ni, Ying Ding, and Zhi-Chuan Niu
Opt. Express 30(21) 38208-38215 (2022)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved