title: Assessing the potential of Mg-doped Cr₂O₃ as a novel p-type transparent conducting oxide.
abstract: One of the current challenges faced by material scientists is the development of a p-type transparent conducting oxide with levels of optical transparency and electronic conductivity to equal those of the universally n-type industry leaders such as Sn-doped In2O3. The discovery of a p-type analogue would allow for the combination of both polarities into a heterojunction, accessing the potential for transparent electronics. In this study, an insulating material, Cr2O3, is investigated both experimentally and computationally to determine if it is a viable p-type host matrix as has been recently proposed in the literature. The geometric and electronic structure are examined by high resolution x-ray diffraction, x-ray photoelectron spectroscopy, and periodic density functional theory (specifically, PBE  +  U). By incorporating Mg and performing a comprehensive defect analysis, the dominant intrinsic and extrinsic carriers in the material are determined, and it is shown that Cr2O3 has the potential to display p-type conductivity when appropriately doped.
authors.affiliation: School of Chemistry and CRANN, Trinity College Dublin, Dublin 2, Ireland.
authors.forename: Aoife B
authors.initials: AB
authors.lastname: Kehoe
authors.forename: Elisabetta
authors.initials: E
authors.lastname: Arca
authors.forename: David O
authors.initials: DO
authors.lastname: Scanlon
authors.forename: Igor V
authors.initials: IV
authors.lastname: Shvets
authors.forename: Graeme W
authors.initials: GW
authors.lastname: Watson