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Growth of HgTe Quantum Wells for IR to THz Detectors

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We zone-engineered HgCdTe/HgTe/HgCdTe quantum wells (QWs) using the molecular-beam epitaxy (MBE) method with in situ high-precision ellipsometric control of composition and thickness. The variations of ellipsometric parameters in the ψ–Δ plane were represented by smooth broken curves during HgTe QW growth with abrupt composition changes. The form of the spiral fragments and their extensions from fracture to fracture revealed the growing layer composition and its thickness. Single and multiple (up to 30) Cd x Hg1−x Te/HgTe/Cd x Hg1−x Te QWs with abrupt changes of composition were grown reproducibly on (013) GaAs substrates. HgTe thickness was in the range of 16 nm to 22 nm, with the central portion of Cd x Hg1−x Te spacers doped by In to a concentration of 1014 cm−3 to 1017 cm−3. Based on this research, high-quality (013)-grown HgTe QW structures can be used for all-electric detection of radiation ellipticity in a wide spectral range, from far-infrared (terahertz radiation) to mid-infrared wavelengths. Detection was demonstrated for various low-power continuous-wave (CW) lasers and high-power THz pulsed laser systems.

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Acknowledgements

The work was financially supported by Grant RBFR 09-02-00467-a, Grant No. 27/28 from the Russian Academy of Sciences, and the DFG.

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Authors and Affiliations

  1. A.V. Rzhanov Institute of Semiconductor Physics of SB RAS, Novosibirsk, Russia

    S. Dvoretsky, N. Mikhailov, Yu. Sidorov & V. Shvets

  2. Terahertz Center, University of Regensburg, 93040, Regensburg, Germany

    S. Danilov, B. Wittman & S. Ganichev

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  1. S. Dvoretsky
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  2. N. Mikhailov
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  3. Yu. Sidorov
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  4. V. Shvets
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  7. S. Ganichev
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Correspondence to S. Dvoretsky.

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Dvoretsky, S., Mikhailov, N., Sidorov, Y. et al. Growth of HgTe Quantum Wells for IR to THz Detectors. J. Electron. Mater. 39, 918–923 (2010). https://doi.org/10.1007/s11664-010-1191-7

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  • DOI: https://doi.org/10.1007/s11664-010-1191-7

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