Research Papers

Performance improvement of quantum well infrared photodetectors through modeling

[+] Author Affiliations
Mohamed S. El-Tokhy, Imbaby I. Mahmoud

Atomic Energy Authority, Research Centre, Engineering Department, Inshas, Cairo 11511 Egypt

Hussein A. Konber

Al Azhar University, Electrical Engineering Department, Nasr City, Cairo 81624 Egypt

J. Nanophoton. 4(1), 043518 (September 27, 2010). doi:10.1117/1.3502660
History: Received May 14, 2010; Revised August 15, 2010; Accepted September 20, 2010; September 27, 2010; Online September 27, 2010
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Abstract

We study the performance of quantum well infrared photodetectors (QWIPs) in the case of infrared irradiation. This type of photodetector is interesting from the point of view that QWIPs have numerous advantages over photodetectors based on HgCdTe in terms of large array size, high uniformity, high yield, radiation hardness and lower cost of the systems. Therefore, it is important to evaluate their characteristics theoretically. We develop a simple modeling for this interesting type of photodetector. This model describes a nontrivial evaluation of the most important characteristics. The potential distribution of the developed model is obtained by self-consistently solving the Poisson equation. On the other hand, it is used to calculate the dark current, responsivity and detectivity as a function of the structural parameters. These parameters are the spacing between the wells, the number of quantum wells and the operating temperature. Also, the optimization of the characteristics of QWIPs is of primary concern. The effect of uniformity of the dopant density in the QWIP is studied theoretically. We find that the uniformity of the dopant distribution in the plane of QW decreases the dark current.

© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Mohamed S. El-Tokhy ; Imbaby I. Mahmoud and Hussein A. Konber
"Performance improvement of quantum well infrared photodetectors through modeling", J. Nanophoton. 4(1), 043518 (September 27, 2010). ; http://dx.doi.org/10.1117/1.3502660


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