Title :
ZnO/Al2O3 core-shell nanorod arrays: Growth, structural characterization, and luminescent property
Author :
Chen, C.Y. ; Lin, C.A. ; Chen, M.J. ; Lin, G.R. ; He, J.H.
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
We reported the aqueous chemical method to fabricate the well-aligned ZnO/Al2O3 nanocrystal (NC) core-shell nanorod arrays (NRAs). Structural characterization showed that the shell layers are composed of ¿-Al2O3 nanocrystals. Photoluminescence measurements showed the enhancement of near-band-edge (NBE) emission of ZnO NRAs due to the presence of Al2O3 NC shells. The Al2O3 NC shell layer resulting in flatband effect near ZnO surface leads to a stronger overlap of the wavefunctions of electrons and holes in the ZnO core, further enhancing the NBE emission. This approach should be very useful in designing many other core-shell NRAs for creating varieties of high-efficiency optoelectronic devices.
Keywords :
II-VI semiconductors; aluminium compounds; crystal growth; nanorods; optoelectronic devices; photoluminescence; wave functions; wide band gap semiconductors; zinc compounds; ZnO-Al2O3; aqueous chemical method; core-shell nanorod arrays; luminescent property; near band edge emission; optoelectronic devices; photoluminescence measurements; structural characterization; wave functions; well-aligned nanocrystal growth; Aluminum oxide; Electron emission; Nanocrystals; Optical refraction; Optical surface waves; Optical variables control; Optoelectronic devices; Photoluminescence; Temperature; Zinc oxide;
Conference_Titel :
Nanoelectronics Conference (INEC), 2010 3rd International
Conference_Location :
Hong Kong
Print_ISBN :
978-1-4244-3543-2
Electronic_ISBN :
978-1-4244-3544-9
DOI :
10.1109/INEC.2010.5424798
