InAs/GaSb superlattice detectors for the long-wavelength infrared regime

Robert Rehm; Michael Masur; Johannes Schmitz; Martin Walther

doi:10.1117/12.2050438

24 June 2014 InAs/GaSb superlattice detectors for the long-wavelength infrared regime

Robert Rehm, Michael Masur, Johannes Schmitz, Martin Walther

Proceedings Volume 9070, Infrared Technology and Applications XL; 90700T (2014) https://doi.org/10.1117/12.2050438
Event: SPIE Defense + Security, 2014, Baltimore, MD, United States

Abstract

To enable higher operating temperatures in InAs/GaSb superlattice detectors for the long-wavelength infrared atmospheric window at 8-12 μm, a reduction of the bulk dark current density is indispensable. To reduce the dark current of conventional homojunction pin-diode device designs, bandstructure-engineering of the active region is considered most promising. So far, several successful device concepts have been demonstrated, yet they all rely on the inclusion of Aluminum within the active layers. Driven by manufacturing aspects we propose an Al-free heterojunction device concept that is based on a p⁺-doped InAs/GaSb superlattice absorber layer combined with an adjacent N^--doped high gap region, which again is realized with an InAs/GaSb superlattice. To calculate the superlattice band gap and the position of the conduction band edge at the heterojunction we employ the Superlattice Empirical Pseudopotential Method. With a series of three heterojunction p⁺N^- InAs/GaSb superlattice devices with an absorber band gap of 124 meV (10.0 μm) we give a first proof of the advocated device concept.

Citation Download Citation

Robert Rehm, Michael Masur, Johannes Schmitz, and Martin Walther "InAs/GaSb superlattice detectors for the long-wavelength infrared regime", Proc. SPIE 9070, Infrared Technology and Applications XL, 90700T (24 June 2014); https://doi.org/10.1117/12.2050438

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available