Optical characterization of periodically polarity-inverted ZnO structures on (0001) Al2O3 substrates
- Authors
- Park, Jinsub; Lee, Woong; Ha, Jun-Seok; Kwon, Min-Ki; Lee, Hyo-Jong
- Issue Date
- Sep-2013
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Polarity; ZnO; Array; Optical properties; Extraction
- Citation
- CURRENT APPLIED PHYSICS, v.13, no.7, pp.1213 - 1217
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- CURRENT APPLIED PHYSICS
- Volume
- 13
- Number
- 7
- Start Page
- 1213
- End Page
- 1217
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/162026
- DOI
- 10.1016/j.cap.2013.03.013
- ISSN
- 1567-1739
- Abstract
- We investigated the optical properties of periodically polarity-inverted (PPI) ZnO structures formed on (0001) Al2O3 substrates by evaluating the cathodoluminescence (CL) as a function of the acceleration voltage (V-acc). At surface regions with a low V-acc, the emission from the interface region was dominant but the dominant emission source changed to the Zn-polar regions as V-acc was increased, which can be explained by the different exciton diffusion lengths. The dependence of the emission properties on V-acc showed a slight red shift as V-acc increased and a larger red shift was observed in the Zn-polar regions. Moreover, the interface regions showed the highest intensity compared to other regions, which can be explained by the results of the geometrical analysis conducted using a finite-differential time domain simulation.
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