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Post annealing effect on the photoluminescence properties of ZnO thin films prepared by atomic layer epitaxy  

신경철 (인하대학교 공과대학 재료공학부)
임종민 (인하대학교 공과대학 재료공학부)
강승모 (인하대학교 공과대학 재료공학부)
이종무 (인하대학교 공과대학 재료공학부)
Publication Information
Journal of the Korean Vacuum Society / v.13, no.3, 2004 , pp. 103-108 More about this Journal
Abstract
High-quality ZnO films were grown on sapphire (001) substrates by the atomic layer epitaxy (ALE) technique using DEZn as a Zinc precusor and $H_2O $ as an oxidant at both $170^{\circ}C$ and $400^{\circ}C$ which are in the ALE and the CVD process temperature ranges, respectively. The films were annealed in an oxygen atmosphere in the temperature range from 600 to 100$0^{\circ}C$ for an hour and then investigate photoluminescence (PL) properties using He-Cd laser. PL intensity tends to increases as the annealing temperature increase for both the annealed ZnO films grown at $170^{\circ}C$ and $400^{\circ}C$ , while PL did not nearly occur at the as-deposited ones. The PL intensity of the ZnO film grown at $400^{\circ}C$ is low after it is annealed at high temperature owing to a large number of Zn-Zn bonds although it has increased in the visible light wavelength region after annealing. In contrast the PL intensity has increased significant in the visible light region after annealing
Keywords
ZnO; Atomic Layer Epitaxy; Photoluminescence; Atomic Layer Epitaxy; Photoluminescence; Post annealing; (001) Sapphire substrate;
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