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Quantum transport studies on type-II superlattice absorber configurations for infrared photodetection
Journal
Proceedings of SPIE - The International Society for Optical Engineering
ISSN
0277786X
Date Issued
2022-01-01
Author(s)
Singh, Anuja
Muralidharan, Bhaskaran
Abstract
Type-II Superlattice (T2SL), owing to its band-tunability and controllable photo-absorption, is preferred over conventional HgCdTe to design the absorber region in infrared photodetectors. The T2SL demonstrates completely dissimilar properties from its constituent materials. The widths of InAs and GaSb considered in one period of the T2SL play a significant role in determining its photoresponse. This work encompasses a comparative study of two different T2SL absorbers by considering both the semi-empirical and quantum mechanical approaches to gain deeper insights of the electronic band properties and miniband characteristics of these absorbers. In particluar, 12ML/12ML and 11ML/7ML T2SL absorbers are investigated, which have a similar bandgap of 0.17 eV corresponding to the wavelength of 7.2 µm and the ratios of InAs-to-GaSb widths are approximately 1 and 1.5, respectively.
Volume
12139
Subjects