Molecular beam epitaxial growth and characterization of intrinsic and p-type InN nanowires

Zetian Mi; Songrui Zhao; Binh Huy Le; Omid Salehzadeh; Shima Alagha; Karen L. Kavanagh; Simon P. Watkins

doi:10.1117/12.2038663

19 February 2014 Molecular beam epitaxial growth and characterization of intrinsic and p-type InN nanowires

Zetian Mi, Songrui Zhao, Binh Huy Le, Omid Salehzadeh, Shima Alagha, Karen L. Kavanagh, Simon P. Watkins

Proceedings Volume 8996, Quantum Dots and Nanostructures: Synthesis, Characterization, and Modeling XI; 899602 (2014) https://doi.org/10.1117/12.2038663
Event: SPIE OPTO, 2014, San Francisco, California, United States

Abstract

We have investigated the molecular beam epitaxial growth and characterization of InN nanowires. Detailed optical and electrical transport studies confirm that nondoped InN nanowires can exhibit extremely low (< 10¹⁵ cm^-3) residual electron density. Furthermore, the near-surface Femi-level was measured to be 0.4 to 0.5 eV above the valence band maximum (VBM), suggesting the absence of Fermi-level pinning and surface electron accumulation. These features are fundamentally different from those of n-type degenerate InN nanowires or InN epilayers. The absence of surface electron accumulation was also observed in Mg-doped InN nanowires, where p-type conduction was directly measured via Mg-doped InN nanowire field-effect transistors. Furthermore, the near-surface Fermi-level can be tuned from 0.1 eV to 1 eV above the VBM, i.e., from p-type degenerate to n-type degenerate through controlled Mg and Si dopant incorporations, a first demonstration for any semiconducting nanowire structures.

Citation Download Citation

Zetian Mi, Songrui Zhao, Binh Huy Le, Omid Salehzadeh, Shima Alagha, Karen L. Kavanagh, and Simon P. Watkins "Molecular beam epitaxial growth and characterization of intrinsic and p-type InN nanowires", Proc. SPIE 8996, Quantum Dots and Nanostructures: Synthesis, Characterization, and Modeling XI, 899602 (19 February 2014); https://doi.org/10.1117/12.2038663

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