Journal
SEMICONDUCTORS
Volume 53, Issue 10, Pages 1363-1366Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S106378261910021X
Keywords
HgTe; CdHgTe heterostructure; quantum well; residual photoconductivity
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Funding
- Institute of Metal Physics, Ural Branch, Russian Academy of Sciences [0035-2019-0020-S01]
- Russian Foundation for Basic Research [18-02-00309]
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Residual-photoconductivity spectra (RPS) are studied for HgTe/CdHgTe quantum-well heterostructures of n- and p-type conduction at T = 4.2 K. RPS is shown to be both positive (an increase in the carrier concentration in the quantum well) and negative depending on the illumination wavelength. The RPS maxima in the sample with n-type conduction in general correspond to the RPS minima in the p-type samples and vice versa. It is found for p-type samples that illumination at specific wavelengths leads to the freezing of free carriers in the quantum well (QW) but not to a change in the conduction type. This fact indicates the important role of the built-in electric field in the RPS mechanism; this field is switched-off upon QW neutralization.
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