Share Email Print
cover

Proceedings Paper

Extraction of minority carrier diffusion length of MWIR Type-II superlattice nBp detector
Author(s): Zahra Taghipour; Alireza Kazemi; Stephen Myers; Priyalal Wijewarnasuriya; Sen Mathews; Elizabeth H. Steenbergen; Christian Morath; Vincent M. Cowan; Gamini Ariyawansa; John Scheihing; Sanjay Krishna
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

We present a model for the spectral external quantum efficiency (EQE) to extract the minority carrier diffusion length (Ln) of a unipolar nBp InAs/GaSb Type-II superlattice (T2SL) mid-wave infrared (MWIR) detector. The detector consists of a 4 μm thick p-doped 10ML InAs/10ML GaSb SL absorber with a 50% cut-off wavelength of 5 μm at 80 K and zero bias. The n-type doped InAs/AlSb SL barrier in the structure was included to reduce the GR dark current. By fitting the experimentally measured EQE data to the theoretically calculated QE based on the solution of the drift-diffusion equation, the p-type absorber was found the have Ln = 10 ± 0.5 μm at 80K, and Ln = 12 ± 0.5 μm at 120K and 150K. We performed the absorption coefficient measurement at different temperatures of interest. Also, we estimated the reduced background concentration and the built-in potential by utilizing a capacitance-voltage measurement technique. We used time-resolved-photoluminescence (TRPL) to determine the lifetime at 80K. With the result of the model and the lifetime measurement, we calculated the diffusion coefficient and the mobility in the T2SL detector at various temperatures. Also, we studied the behavior of different dark current mechanisms by fitting the experimentally measured and simulated dark current density under different operating temperatures and biases.

Paper Details

Date Published: 30 August 2017
PDF: 10 pages
Proc. SPIE 10404, Infrared Sensors, Devices, and Applications VII, 1040406 (30 August 2017); doi: 10.1117/12.2274591
Show Author Affiliations
Zahra Taghipour, The Univ. of New Mexico (United States)
Alireza Kazemi, The Univ. of New Mexico (United States)
The Ohio State Univ. (United States)
Stephen Myers, SK Infrared LLC (United States)
Priyalal Wijewarnasuriya, U.S. Army Research Lab. (United States)
Sen Mathews, The Univ. of New Mexico (United States)
Elizabeth H. Steenbergen, Air Force Research Lab. (United States)
Christian Morath, Air Force Research Lab. (United States)
Vincent M. Cowan, Air Force Research Lab. (United States)
Gamini Ariyawansa, Air Force Research Lab. (United States)
John Scheihing, Air Force Research Lab. (United States)
Sanjay Krishna, The Univ. of New Mexico (United States)
The Ohio State Univ. (United States)
SK Infrared LLC (United States)


Published in SPIE Proceedings Vol. 10404:
Infrared Sensors, Devices, and Applications VII
Paul D. LeVan; Ashok K. Sood; Priyalal Wijewarnasuriya; Arvind I. D'Souza, Editor(s)

© SPIE. Terms of Use
Back to Top
PREMIUM CONTENT
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?
close_icon_gray