High-resolution x-ray spectroscopic study of the electronic structure of the prototypical p-type transparent conducting oxide CuAlO2 -: art. no. 195115

The electronic structure of the prototypical p-type transparent conducting oxide CuAlO2 has been studied by O K and Cu L-3 shell x-ray absorption and emission and Al K alpha excited x-ray photoemission spectroscopy. The nonresonant O K shell emission is dominated by the O 2p partial density of states, while the Al K alpha excited valence photoemission and nonresonant Cu L-3 emission spectra are dominated by the Cu 3d partial density of states. All three techniques reveal mixing between O 2p and Cu 3d states. Cu L-3 emission spectra excited just above the L-3 threshold are dominated by inelastic scattering with 5.5 eV energy loss. This energy is shown to correspond to the separation between the dominant peaks in the filled and empty densities of states.