Structural and optical property investigations on Mg-alloying in epitaxial zinc oxide films on sapphire

Conference · Sat Jul 01 04:00:00 EDT 2000

OSTI ID:20104566

Sharma, A K; Jin, C; Kvit, A; Narayan, J; Muth, J F; Teng, C W; Kolbas, R M; Holland, O W

The authors have synthesized single-crystal epitaxial MgZnO films by pulsed-laser deposition. High-resolution transmission electron microscopy, X-ray diffraction and Rutherford backscattering spectroscopy/ion channeling were used to characterize the microstructure, defect content, composition and epitaxial single-crystal quality of the films. In these films with up to {approximately} 34 atomic percent Mg incorporation, an intense ultraviolet band edge photoluminescence at room temperature and 77 K was observed. The highly efficient photoluminescence is indicative of the excitonic nature of the material. Transmission spectroscopy revealed that the excitonic structure of the alloys was clearly visible at room temperature. Post-deposition annealing in oxygen reduced the number of defects and improved the optical properties of the films. The potential applications of MgZnO alloys in a variety of optoelectronic devices are discussed.

• Research Organization: North Carolina State Univ., Raleigh, NC (US)
• Sponsoring Organization: National Science Foundation; US Department of Energy
• DOE Contract Number: AC05-96OR22464
• OSTI ID: 20104566
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ELECTRON MICROSCOPY
ENERGY BEAM DEPOSITION
EXPERIMENTAL DATA
MAGNESIUM OXIDES
MICROSTRUCTURE
OPTICAL PROPERTIES
PHOTOLUMINESCENCE
THIN FILMS
X-RAY DIFFRACTION
ZINC OXIDES