Surface dipole modifications were identified for contamination-free In(2)O(3)-based transparent conducting oxides by ultraviolet photoelectron spectroscopy on both thin film and bulk ceramic specimens. In particular, heating in air was found to result in an increase in ionization potential and work function. The formation of surface dipoles may be related to the unique structure (crystal, defect) of bixbyite-based materials. These findings have important ramifications for the tuning of work functions in In(2)O(3)-based transparent conductors. (c) 2008 American Institute of Physics.
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