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Photoelectron spectra of untreated and treated InN surfaces. The insets are the core-level spectra of and for untreated and treated InN surfaces and the LEED image of a treated InN surface with electron energy of 129 eV.
(a) Valence band spectra of InN(0001) surface (bottom) with HCl treatment, InN surface (middle) without HCl treatment, and InN surface (top) with HCl treatment. (b) Band diagram of InN surface with HCl treatment, showing flatband condition . (c) Band diagram of InN surface without HCl treatment, showing strong downward surface band bending condition .
Comparison of experimental and calculated In/N ratios for the InN (0001) and InN surfaces vs the number of excessive In monolayers.
Summary of surface band bending values vs orientations and surface compositions of InN. The bulk Fermi level positions of InN are estimated from different band models of carrier concentration (assuming that the band gap energy of InN is ). The surface Fermi level positions of InN are determined from Fig. 2(a).
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