標題: Size dependence of the electronic structures and electron-phonon coupling in ZnO quantum dots
作者: Ray, S. C.
Low, Y.
Tsai, H. M.
Pao, C. W.
Chiou, J. W.
Yang, S. C.
Chien, F. Z.
Pong, W. F.
Tsai, M. -H.
Lin, K. F.
Cheng, H. M.
Hsieh, W. F.
Lee, J. F.
光電工程學系
Department of Photonics
公開日期: 24-Dec-2007
摘要: The electronic structures and optical properties of various sizes of ZnO quantum dots (QDs) were studied using x-ray absorption, photoluminescence, and Raman spectroscopy. The increase in the intensity ratio of the second-order Raman spectra of longitudinal optical mode and its fundamental mode, which is related to the strength of the electron-phonon coupling (EPC), is found to increase with the size of QD. The trend of EPC also correlates with the increase of the intensity ratio of the O 2p(pi) (I(pi)) and 2p(sigma) (I(sigma)) orbital features in the O K-edge x-ray absorption near-edge structure (XANES) as the size of QD increases. The EPC and XANES results suggest that the crystal orientations of ZnO QDs are approximately aligned with the c axis parallel with the polarization of x-ray photons. (c) 2007 American Institute of Physics.
URI: http://dx.doi.org/10.1063/1.2824396
http://hdl.handle.net/11536/9995
ISSN: 0003-6951
DOI: 10.1063/1.2824396
期刊: APPLIED PHYSICS LETTERS
Volume: 91
Issue: 26
結束頁: 
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