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Title: Sodium doping in ZnO crystals

ZnO bulk single crystals were doped with sodium by thermal diffusion. Positron annihilations spectroscopy confirms the filling of zinc vacancies, to >6 μm deep in the bulk. Secondary-ion mass spectrometry measurement shows the diffusion of sodium up to 8 μm with concentration (1–3.5) × 10{sup 17 }cm{sup −3}. Broad photoluminescence excitation peak at 3.1 eV, with onset appearance at 3.15 eV in Na:ZnO, is attributed to an electronic transition from a Na{sub Zn} level at ∼(220–270) meV to the conduction band. Resistivity in Na doped ZnO crystals increases up to (4–5) orders of magnitude at room temperature.
Authors:
;  [1]
  1. Center for Materials Research, Washington State University, Pullman, Washington 99164-2711 (United States)
Publication Date:
OSTI Identifier:
22399102
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNIHILATION; CONCENTRATION RATIO; DOPED MATERIALS; EV RANGE; EXCITATION; MASS SPECTROSCOPY; MONOCRYSTALS; PHOTOLUMINESCENCE; POSITRONS; SODIUM; TEMPERATURE RANGE 0273-0400 K; THERMAL DIFFUSION; VACANCIES; ZINC; ZINC OXIDES