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Broadening of Absorption Spectrum in a P-type InGaAs-InAlAs Coupled Quantum Well
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- Authors
- Issue Date
- 1997-12
- Publisher
- Institute of Physics
- Citation
- Semicond. Sci. Technol. 12 1579
- Abstract
- The intervalence subband absorption of normally incident infrared
radiation in a p-type InGaAs–InAlAs coupled quantum well (CQW) is theoretically
investigated by the multiband effective mass formalism. We calculate valence
subband structures, intervalence subband transition matrix elements and the
absorption coefficient spectrum in the CQW which consists of a wider well, a
thinner well and a barrier between. We demonstrate that the absorption coefficient
profile can be tailored to suit ones need by careful control of the flexible design
parameters given to the valence band CQW structure. For the application to an
infrared detector with a flat absorptivity over a wider wavelength range than the
conventional detectors, the CQW is designed to have broadened absorption
spectrum
- ISSN
- 0268-1242
- Language
- English
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