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Title: Potassium acceptor doping of ZnO crystals

ZnO bulk single crystals were doped with potassium by diffusion at 950°C. Positron annihilation spectroscopy confirms the filling of zinc vacancies and a different trapping center for positrons. Secondary ion mass spectroscopy measurements show the diffusion of potassium up to 10 μm with concentration ∼1 × 10{sup 16} cm{sup −3}. IR measurements show a local vibrational mode (LVM) at 3226 cm{sup −1}, at a temperature of 9 K, in a potassium doped sample that was subsequently hydrogenated. The LVM is attributed to an O–H bond-stretching mode adjacent to a potassium acceptor. When deuterium substitutes for hydrogen, a peak is observed at 2378 cm{sup −1}. The O-H peak is much broader than the O-D peak, perhaps due to an unusually low vibrational lifetime. The isotopic frequency ratio is similar to values found in other hydrogen complexes. Potassium doping increases the resistivity up to 3 orders of magnitude at room temperature. The doped sample has a donor level at 0.30 eV.
Authors:
;  [1] ;  [2] ; ;  [3]
  1. Center for Materials Research, Washington State University, Pullman, Washington 99164-2711 (United States)
  2. (United States)
  3. Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164-2814 (United States)
Publication Date:
OSTI Identifier:
22488569
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 5; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DEUTERIUM; DIFFUSION; DOPED MATERIALS; HYDROGEN; HYDROGEN COMPLEXES; HYDROGENATION; ION MICROPROBE ANALYSIS; MASS SPECTROSCOPY; MONOCRYSTALS; PEAKS; POSITRONS; POTASSIUM; ZINC; ZINC OXIDES