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19 April 1996 Waveguide effect in quantum well infrared photodetectors
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The possibility of quantum efficiency enhancement in GaAs/AlGaAs quantum well infrared photodetectors (QWIP) by means of waveguide propagation of radiation in superlattice is investigated in this paper. Epitaxial structures for photodetector manufacturing were grown by low pressure metal organic chemical vapor deposition (LP-MOCVD) on high doped (3 (DOT) 1018 cm-3) n-type substrates. The use of these high doped conductive substrates allows us to achieve an abrupt change of refractive index on interface between superlattice and substrate. Due to this fact optical restriction of electromagnetic wave propagation along superlattice arises. A fine structure with peaks ((Delta) (lambda) equals 0.1 mkm) was found on the photosensitivity spectra of this QWIP ((lambda) max equals 9 mkm). We consider this effect can be explained by arising of standing waves in volume of QWIP. It indicates one possibility of waveguide propagation of radiation in QWIP structures grown on high doped conductive substrates. The use of QWIP on conductive substrates allows us to increase a quantum efficiency and to simplify the technology QWIP-lines manufacturing.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Grachik H. Avetisyan, Vladimir B. Kulikov, Igor Dmitrievich Zalevsky, Vladimir V. Kovalevsky, and A. F. Plotnikov "Waveguide effect in quantum well infrared photodetectors", Proc. SPIE 2694, Quantum Well and Superlattice Physics VI, (19 April 1996);

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