Structural and optical investigations of periodically polarity inverted ZnO heterostructures on (0001) Al2O3

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We report the structural and optical properties of one-dimensional grating of ZnO consisting of periodically polarity inverted structures on (0001) Al2O3 substrates. The inversion domain boundaries (IDBs) between the Zn- and the O-polar ZnO regions were clearly observed by transmission electronic microscopy. The investigation of spatially resolved local photoluminescence (PL) revealed strong excitonic emission at the interfacial region including the IDBs. The possible mechanism of strong PL has been discussed by the consideration of atomic configuration and carrier collection including its lifetime and diffusion process in Zn- and O-polar regions. Therefore the authors conclude that the IDBs can be active for the strong emission not a nonradiative center.
Publisher
AMER INST PHYSICS
Issue Date
2009-04
Language
English
Article Type
Article
Keywords

INVERSION DOMAIN BOUNDARIES; THIN-FILMS; GENERATION; GAN; FABRICATION

Citation

APPLIED PHYSICS LETTERS, v.94, no.14

ISSN
0003-6951
DOI
10.1063/1.3114989
URI
http://hdl.handle.net/10203/95579
Appears in Collection
MS-Journal Papers(저널논문)
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