Terahertz magneto-photoconductive characterization of hydrogenic barrier donors in GaAs/AlGaAs epitaxial thin films

Barrier shallow donor states have been investigated in Si-doped GaAs/AlGaAs quantum well structures by means of magneto-photoconductive spectroscopy. In order to promote formation of barrier-only donors, only barrier regions have been doped in the present work. High resolution and signal-to-noise ra...

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Bibliographic Details
Published in:Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 2004-05, Vol.22 (3), p.1580-1583
Main Authors: Naweed, Ahmer, Goodhue, William D., Gorveatt, William J., Giles, Robert, Waldman, Jerry, Menon, Vinod
Format: Article
Language:English
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Summary:Barrier shallow donor states have been investigated in Si-doped GaAs/AlGaAs quantum well structures by means of magneto-photoconductive spectroscopy. In order to promote formation of barrier-only donors, only barrier regions have been doped in the present work. High resolution and signal-to-noise ratio barrier donor spectra have been obtained, which clearly demonstrate the advantage of the photoconduction measurement technique. Observation of barrier donor transitions in a single quantum well structure is also reported. Good agreement is found between experimentally and theoretically determined magnetic field dependence of donor transition energies.
ISSN:0734-211X
1071-1023
1520-8567
DOI:10.1116/1.1738664