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Intersubband absorption in Si1–xGex/Si superlattices for long wavelength infrared detectors

Rajakarunanayake, Y. and McGill, T. C. (1990) Intersubband absorption in Si1–xGex/Si superlattices for long wavelength infrared detectors. Journal of Vacuum Science and Technology B, 8 (4). pp. 929-935. ISSN 1071-1023. http://resolver.caltech.edu/CaltechAUTHORS:RAJjvstb90

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Abstract

We have calculated the absorption strengths for intersubband transitions in n-type Si1–xGex/Si superlattices. These transitions can be used for the detection of long-wavelength infrared radiation. A significant advantage in Si1–xGex/Si superlattice detectors is the ability to detect normally incident light; in Ga1–xAlxAs/GaAs superlattices intersubband absorption is possible only if the incident light contains a polarization component in the growth direction of the superlattice. We present detailed calculations of absorption coefficients, and peak absorption wavelengths for [100], [111], and [110] Si1–xGex/Si superlattices. Peak absorption strengths of about 2000–6000 cm^–1 were obtained for typical sheet doping concentrations ([approximately-equal-to]10^12 cm^–2). Absorption comparable to that in Ga1–xAlxAs/GaAs superlattice detectors, compatibility with existing Si technology, and the ability to detect normally incident light make these devices promising for future applications.


Item Type:Article
Additional Information:© 1990 American Vacuum Society. (Received 31 January 1990; accepted 19 March 1990) This work was supported by the Defense Advanced Projects Agency, under Contract No. N00014-89-J-3196. We also like to acknowledge useful discussions with R.J. Hauenstein, E.T. Yu, R.H. Miles, and D.L. Smith.
Subject Keywords:SUPERLATTICES; ABSORPTION SPECTRA; INFRARED SPECTRA; PHOTODETECTORS; BAND STRUCTURE; INTRABAND TRANSITIONS; POLARIZATION; SILICON ALLOYS; GERMANIUM ALLOYS; BINARY ALLOYS; INFRARED RADIATION; SILICON; RADIATION DETECTION
Record Number:CaltechAUTHORS:RAJjvstb90
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:RAJjvstb90
Alternative URL:http://dx.doi.org/10.1116/1.584945
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10193
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:16 Apr 2008
Last Modified:26 Dec 2012 09:57

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