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Electron energy structure of self-assembled In(Ga)As nanostructures probed by capacitance-voltage spectroscopy and one-dimensional numerical simulation

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Abstract

The electron energy structure of self-assembled In(Ga)As/GaAs nanostructures, quantum dots, and quantum rings was studied with capacitance-voltage spectroscopy and one-dimensional numerical simulation using Poisson/Schrödinger equations. The electron energy levels in the quantum dots and quantum rings with respect to the electron ground state of the wetting layer were determined directly from capacitance-voltage measurements with a linear lever arm approximation. In the regime where the linear lever arm approximation was not valid anymore (after the charging of the wetting layer), the energy difference between the electron ground state of the wetting layer and the GaAs conduction band edge was obtained indirectly from a numerical simulation of the conduction band under different gate voltages, which led to the erection of complete electron energy levels of the nanostructures in the conduction band.

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Authors and Affiliations

  1. Department of Electronic Materials Engineering, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT, 0200, Australia

    Wen Lei & Chennupati Jagadish

  2. Department of Physics and CeNIDE, Universität Duisburg-Essen, D-47048, Duisburg, Germany

    Christian Notthoff, Matthias Offer, Cedrik Meier & Axel Lorke

  3. Solid State Physics, Ruhr-Universität Bochum, D-44780, Bochum, Germany

    Andreas D. Wieck

Authors
  1. Wen Lei
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  2. Christian Notthoff
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  3. Matthias Offer
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  4. Cedrik Meier
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  5. Axel Lorke
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  6. Chennupati Jagadish
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  7. Andreas D. Wieck
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Correspondence to Wen Lei.

Additional information

This paper was selected as an Outstanding Symposium Paper for the 2008 InternationalMaterials Research Conference, Symposium D. To maintain JMR’s rigorous, unbiased peer review standards, the JMR Principal Editor and reviewers were not made aware of the paper’s designation as Outstanding Symposium Paper.

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Lei, W., Notthoff, C., Offer, M. et al. Electron energy structure of self-assembled In(Ga)As nanostructures probed by capacitance-voltage spectroscopy and one-dimensional numerical simulation. Journal of Materials Research 24, 2179–2184 (2009). https://doi.org/10.1557/jmr.2009.0293

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  • DOI: https://doi.org/10.1557/jmr.2009.0293

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