标题: | 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. 光电工程学系 Department of Photonics |
公开日期: | 24-十二月-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 |
结束页: | |
显示于类别: | Articles |
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