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Back Cover: Characterization of as-grown and adsorbate-covered N-polar InN surfaces using in situ photoelectron spectroscopy (Phys. Status Solidi A 1/2012)



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Eisenhardt et al. (pp. 45–49) characterized the impact of molecular treatment on the surface electronic properties of as-grown N-polar InN using in situ photoelectron spectroscopy (XPS and UPS). The results show that the surface band bending characteristic of as-grown N-polar InN clearly differs from In-polar InN — manifested in lower core level (CL) binding energies. This implies a reduced surface downward band bending for as-grown N-polar InN. Storage in ambient conditions compensates this difference. Hence, the question is raised in which way specific molecular species like oxygen or hydrocarbon molecules interact with the InN surface. The cover picture shows XPS-CL spectra (O 1s and N 1s) of the N-polar InN surface after epitaxial growth and after exposure to molecular oxygen, respectively. They verify the adsorption of the oxygen at the InN(000-1) surface, and illustrate that oxygen interaction induces a rather small variation of the InN(000-1) surface band alignment.