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The electronic structure of delafossite transparent conductive oxides

Authors: M.A.L. Marques

Ref.: MORE 2010 - Meeting on Optical Response in Extended Systems, Vienna, Austria, 3-5/11/2010 (2010)

Abstract: We use hybrid functionals and restricted self-consistent GW, state-of-the-art theoretical approaches for quasi-particle band structures, to study the electronic states of delafossite Cu(Al,In)O2, the first p-type and bipolar transparent conductive oxides. We show that self-consistent GW gives remarkably wider band gaps than all the other approaches used so far. Accounting for polaronic effects in the GW scheme we recover a very nice agreement with experiment. Furthermore, the modifications with respect to the Kohn-Sham bands are strongly k-dependent, which makes questionable the common practice of using a scissor operator. Finally, our results support the view that the low energy structures found in optical experiments, and initially attributed to an indirect transition, are due to intrinsic defects in the samples.

URL: www.physik.at

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