Low-dark current structures for long-wavelength Type-II strained layer superlattice photodiodes

Zhaobing Tian; Eric A. DeCuir Jr.; Priyalal S. Wijewarnasuriya; James W. Pattison; Nutan Gautam; Sanjay Krishna; Nibir Dhar; Roger E. Welser; Ashok K. Sood

doi:10.1117/12.2015489

11 June 2013 Low-dark current structures for long-wavelength Type-II strained layer superlattice photodiodes

Zhaobing Tian, Eric A. DeCuir Jr., Priyalal S. Wijewarnasuriya, James W. Pattison, Nutan Gautam, Sanjay Krishna , Nibir Dhar, Roger E. Welser , Ashok K. Sood

Author Affiliations +

Proceedings Volume 8704, Infrared Technology and Applications XXXIX; 870415 (2013) https://doi.org/10.1117/12.2015489
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

Abstract

This paper describes our efforts on the development of low dark current long-wave infrared (LWIR) photodetectors based on type-II InAs/GaSb strained superlattices. By adopting a so-called pBiBn structure, a hybrid between the conventional PIN structure and unipolar barrier concepts, suppressed dark current and near-zero-bias operation are obtained, respectively. The LWIR photodetector has a dark current density as low as 1.42×10^-5 A/cm² at -60 mV, and R₀A of 5365 Ωcm² at 76 K. The measured peak detectivity at 10.2 µm of 8.7×10¹⁰ cmHz^1/2W^-1 is obtained at -60 mV at 76 K. To further improve the device performances, a newer design with longer cut-off wavelength targeted for near zero-bias was also realized. This 2-µm-thick device exhibits a quantum efficiency of 20% at 10 µm under zero-bias.

Citation Download Citation

Zhaobing Tian, Eric A. DeCuir Jr., Priyalal S. Wijewarnasuriya, James W. Pattison, Nutan Gautam, Sanjay Krishna , Nibir Dhar, Roger E. Welser , and Ashok K. Sood "Low-dark current structures for long-wavelength Type-II strained layer superlattice photodiodes", Proc. SPIE 8704, Infrared Technology and Applications XXXIX, 870415 (11 June 2013); https://doi.org/10.1117/12.2015489

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