Excitonic Effects and Impurity–Defect Emission in GaAs/AlGaAs Structures Used for the Production of Mid-IR Photodetectors
- Authors: Krivobok V.S.1, Litvinov D.A.1, Nikolaev S.N.1, Onishchenko E.E.1, Pashkeev D.A.1,2, Chernopittsky M.A.1, Grigor’eva L.N.1
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Affiliations:
- Lebedev Physical Institute, Russian Academy of Sciences
- RD and P Center “Orion”
- Issue: Vol 53, No 12 (2019)
- Pages: 1608-1616
- Section: Semiconductor Structures, Low-Dimensional Systems, and Quantum Phenomena
- URL: https://journals.rcsi.science/1063-7826/article/view/207366
- DOI: https://doi.org/10.1134/S1063782619160139
- ID: 207366
Cite item
Abstract
A series of undoped GaAs/AlxGa1 –xAs multiple quantum well heterostructures, whose doped analogs are used for the production of photodetectors operating in the spectral range 8–12 μm, is fabricated by molecular-beam epitaxy. For the heterostructures, the spectral position of absorption lines corresponding to the allowed transitions between quantum-confined electron and hole levels in GaAs layers is established. The influence of impurity–defect states on the luminescence and absorption spectra of quantum wells is studied. The excitonic corrections for the allowed transitions are determined in relation to the quantum-well width and the aluminum content in the barrier layers. The role of excitonic effects in restoring the structure of single-electron states from interband-absorption spectra (luminescence-excitation spectra) and the relationship between these states and the working region of IR photodetectors based on GaAs/AlxGa1 –xAs quantum wells are discussed.
Keywords
About the authors
V. S. Krivobok
Lebedev Physical Institute, Russian Academy of Sciences
Email: Ln.grigorjeva@physics.msu.ru
Russian Federation, Moscow, 117942
D. A. Litvinov
Lebedev Physical Institute, Russian Academy of Sciences
Email: Ln.grigorjeva@physics.msu.ru
Russian Federation, Moscow, 117942
S. N. Nikolaev
Lebedev Physical Institute, Russian Academy of Sciences
Email: Ln.grigorjeva@physics.msu.ru
Russian Federation, Moscow, 117942
E. E. Onishchenko
Lebedev Physical Institute, Russian Academy of Sciences
Email: Ln.grigorjeva@physics.msu.ru
Russian Federation, Moscow, 117942
D. A. Pashkeev
Lebedev Physical Institute, Russian Academy of Sciences; RD and P Center “Orion”
Email: Ln.grigorjeva@physics.msu.ru
Russian Federation, Moscow, 117942; Moscow, 111538
M. A. Chernopittsky
Lebedev Physical Institute, Russian Academy of Sciences
Email: Ln.grigorjeva@physics.msu.ru
Russian Federation, Moscow, 117942
L. N. Grigor’eva
Lebedev Physical Institute, Russian Academy of Sciences
Author for correspondence.
Email: Ln.grigorjeva@physics.msu.ru
Russian Federation, Moscow, 117942