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Quantum well mobility and the effect of gate dielectrics in remote doped InSb/AlxIn1 −xSb heterostructures
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Pooley, O. J., Gilbertson, A. M., Buckle, P. D., Hall, R. S., Emeny, M. T., Fearn, M., Halsall, M. P., Cohen, L. F. and Ashley, Tim (2010) Quantum well mobility and the effect of gate dielectrics in remote doped InSb/AlxIn1 −xSb heterostructures. Semiconductor Science and Technology, Volume 25 (Number 12). Article number 125005. doi:10.1088/0268-1242/25/12/125005
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Official URL: http://dx.doi.org/10.1088/0268-1242/25/12/125005
Abstract
Low- and high-field magnetotransport measurements on 30 nm δ-doped InSb/AlInSb quantum wells with different doping densities are reported. Mobilities over the temperature range 2 to 290 K are described using the relaxation time approximation. Screening by electrons in the doping plane and the temperature variation of the Fermi wave vector and effective mass of the carriers are incorporated into the model. High quality, Shubnikov de Haas oscillations are observed in samples that exhibit single sub-band occupancy. However, higher density samples that show considerable parallel conductance with qualitatively poor ρxx(B) are shown to recover high quality Shubnikov de Haas oscillations by deposition of a surface gate with a SiO2 gate dielectric. We show that the incorporation of this gate dielectric significantly modifies the transport properties and results in an increased mobility over ungated structures with the same carrier density. These observations lead to further insight into the carrier scattering mechanisms present in these InSb/AlInSb structures.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science > Engineering | ||||
| Journal or Publication Title: | Semiconductor Science and Technology | ||||
| Publisher: | Institute of Physics Publishing Ltd. | ||||
| ISSN: | 0268-1242 | ||||
| Official Date: | 3 November 2010 | ||||
| Dates: |
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| Volume: | Volume 25 | ||||
| Number: | Number 12 | ||||
| Article Number: | Article number 125005 | ||||
| DOI: | 10.1088/0268-1242/25/12/125005 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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