Effect of Annealing in an Atomic Oxygen Atmosphere on Photoluminescent and Electrical Properties of Hydrothermal ZnO Single Crystals
摘要
The effect of annealing in an atomic oxygen atmosphere on the photoluminescent and electrical properties of highquality ZnO single crystals grown by the hydrothermal method was studied. The spectrum of as-prepared ZnO samples exhibited a series of narrow lines in the UV region and long-wavelength emission peaking at 510 nm. The nature of the observed bands was discussed. Hall effect measurements indicated that the dominant donor in as-prepared ZnO samples had ionization energy ED = 67 meV and concentration ND = 3.6∙1018 cm–3. The ND value decreased to 3.7∙1017 cm–3, while the ED value did not change after heat treatment in an atomic oxygen atmosphere at 600–700°C for 1 h. A ZnO single crystal annealed at 800°C showed p-type conductivity with an acceptor concentration NA = 2.7∙1016 cm–3.