Observation of a two-dimensional electron gas in modulation-doped ZnTe/CdSe quantum wells

I. P. Smorchkova, N. Samarth

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Abstract

We demonstrate the formation of a two-dimensional electron gas in lattice-matched, modulation-doped ZnTe/CdSe quantum well structures. Despite the well-known difficulty in n doping the II-VI semiconductor ZnTe, we find that the unusual type-II band alignment between ZnTe and CdSe allows the efficient transfer of free carriers from n-ZnTe into a CdSe quantum well since the deep donor levels in the n-ZnTe barrier lie above the confined ground state in the CdSe well. The sizeable well depth (∼1.35eV) enables the fabrication of two-dimensional electron gases with sheet concentrations up to ∼6×1012cm-2, and with a low-temperature mobility up to 1.4×104cm2/Vs.

Original languageEnglish (US)
Pages (from-to)3193-3195
Number of pages3
JournalApplied Physics Letters
Volume72
Issue number24
DOIs
Publication statusPublished - Dec 1 1998

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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