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Below band-gap optical absorption in GaxIn1-xSb alloys.
- Source :
- Journal of Applied Physics; 11/1/2005, Vol. 98 Issue 9, p093103, 7p, 4 Charts, 6 Graphs
- Publication Year :
- 2005
-
Abstract
- The below band-gap optical-absorption characteristics of Ga<subscript>x</subscript>In<subscript>1-x</subscript>Sb alloy system have been reported. The different dependencies of the hole and electron absorption mechanisms on wavelength result in significant changes of the absorption characteristics with alloy composition. In the undoped Ga-rich alloy compositions that are p type in nature (due to residual holes resulting from native defects), the inter-valence-band absorption has been found to be the dominant absorption mechanism. With decreasing Ga (increasing indium) mole fraction, the hole to electron ratio decreases for undoped samples. For such samples, absorption due to electrons becomes significant. With n-type extrinsic doping, intervalley transitions are seen for certain Ga-rich compositions, which also alter the absorption characteristics. The dependencies of various absorption mechanisms as a function of wavelength have been analyzed and discussed in this paper. Based on the theoretical analysis presented in this paper, one can calculate the extrinsic doping level necessary for each alloy composition in order to obtain high optical transparency necessary for infrared optical applications. [ABSTRACT FROM AUTHOR]
- Subjects :
- LIGHT absorption
OPTICS
ALLOYS
GALLIUM
ELECTRONS
WAVELENGTHS
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 98
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 18905036
- Full Text :
- https://doi.org/10.1063/1.2128042