title: Nature of native defects in ZnO.
abstract: This study revealed the nature of native defects and their roles in ZnO through positron annihilation and optical transmission measurements. It showed oxygen vacancies are the origin for the shift in the optical absorption band that causes the red or orange coloration. It also revealed experimental evidence that the donor nature of oxygen vacancy is approximately 0.7 eV. In addition, this work showed the Zn interstitial was not the donor in the as-grown ZnO and supported recent calculations that predicted hydrogen in an oxygen vacancy forms multicenter bonds and acts as a shallow donor.
authors.affiliation: Department of Physics and Astronomy and Center for Materials Research, Washington State University, Pullman, WA 99164-2711, USA. selim@wsu.edu
authors.forename: F A
authors.initials: FA
authors.lastname: Selim
authors.forename: M H
authors.initials: MH
authors.lastname: Weber
authors.forename: D
authors.initials: D
authors.lastname: Solodovnikov
authors.forename: K G
authors.initials: KG
authors.lastname: Lynn
mesh_terms: D004583:Electrons; D010100:Oxygen; D015034:Zinc Oxide / Q000737:chemistry
chemical_list: D010100:Oxygen; D015034:Zinc Oxide