Browsing by Author "Liu, W-R"

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Correlation between crystal structure and photoluminescence for epitaxial ZnO on Si(111) using a gamma-Al(2)O(3) buffer layer
(2008-03-21)
Liu, W-R
;
Li, Y-H
;
Hsieh, W. F.
;
Hsu, C-H
;
Lee, W. C.
High-quality ZnO epitaxial films were grown by pulsed-laser deposition on Si (1 1 1) substrates with a thin. gamma-Al(2)O(3) buffer layer. The epitaxial. gamma-Al(2)O(3) buffer layer consists of two (1 1 1) oriented domains rotated 60. from each other against the surface normal, which yields the in-plane epitaxial relationship (1 0 0)ZnO
Improvement of Crystalline and Photoluminescence of Atomic Layer Deposited m-Plane ZnO Epitaxial Films by Annealing Treatment
(2012-10-01)
Yang, S.
;
Lin, B. H.
;
Kuo, C. C.
;
Hsu, H. C.
;
Liu, W-R
Monocrystalline m-plane ZnO epitaxial films with flat surface morphology were grown on m-plane sapphire by using atomic layer deposition. X-ray diffraction and transmission electron microscopy measurements verify not only the in-plane epitaxial relationship of the as-grown films as (10 (1) over bar0)< 0001 >(ZnO)parallel to(10 (1) over bar0)<(1) over bar2 (1) over bar0 > Al2O3 but also the absence of domains with undesirable orientations, which are generally obtained in the m-plane ZnO films grown by other methods. Experimental results indicate that the basal plane stacking fault (BSF) is the dominant structural defects that contribute to the emission at 3.31 eV in m-plane ZnO films. Exactly how thermal annealing affects the structural and optical properties of ZnO epi-films was also investigated. Additionally, based on time-resolved photoluminescence at 5 K, the decay time of BSF related emission and near-band-edge (NBE) emission were determined. Results of this work further demonstrated that the decay time of NBE emission increases with a higher annealing temperature, accompanied by an improvement in crystal structure.