Abstract
The results of detailed study of the magnetotransport properties of broken-gap type II heterojunctions in a GaInAsSb/InAs(GaSb) system are reported. An electron channel with a high charge-carrier mobility (as high as 50000–60000 cm2/(V s)) is observed and studied for the first time in an isotype broken-gap p-GaInAsSb/p-InAs heterostructure. The effects of electron-channel depletion and semimetal-semiconductor transition in the case of heavy doping of the quaternary alloy with acceptors are studied. Magnetotransport properties at temperatures of 4.2–200 K are studied in detail. Data on the energy spectrum and parameters of two-dimensional charge carriers at the heteroboundary are obtained. It is ascertained experimentally that, depending on the composition, either staggered (at x = 0.85) or broken-gap (at x = 0.95) heterojunctions can be formed in the Ga1−x InxAsySb1−y /GaSb, which is confirmed by theoretical calculations. The anomalous Hall effect and negative magnetoresistance were observed in GaInAsSb/InAs:Mn grown on substrates doped heavily with Mn magnetic acceptor impurity so that the hole concentration was as high as p > 5 × 1018 cm−3; these phenomena are caused by exchange interaction of Mn ions in InAs with high-mobility charge carriers in the electron channel at the heterointerface.
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Original Russian Text © T.I. Voronina, T.S. Lagunova, M.P. Mikhaĭlova, K.D. Moiseev, A.F. Lipaev, Yu.P. Yakovlev, 2006, published in Fizika i Tekhnika Poluprovodnikov, 2006, Vol. 40, No. 5, pp. 519–535.
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Voronina, T.I., Lagunova, T.S., Mikhaĭlova, M.P. et al. Magnetotransport properties of type II heterojunctions based on GaInAsSb/InAs and GaInAsSb/GaSb. Semiconductors 40, 503–520 (2006). https://doi.org/10.1134/S1063782606050022
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DOI: https://doi.org/10.1134/S1063782606050022