Fabrication and optical properties of MgxZn1-xO thin films |
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Authors: | Zhang Xi-Jian Yuan Hui-Min Wang Qing-Pu Wang Tong and Ma Hong-Lei |
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Institution: | a) a) School of Physics, Shandong University, Jinan 250100, China b) Department of Physical Science and Technology, Shandong Institute of Education, Jinan 250013, China |
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Abstract: | Mg_xZn_1 - xO (x \le 0.3) thin films have been
prepared on silicon substrates by radio frequency magnetron
sputtering at room temperature. The thin films have hexagonal
wurtzite single-phase structure and a preferred orientation with the
c-axis perpendicular to the substrates. The Mg content in the
films is slightly larger than that in the targets. The refractive
indices of Mg_xZn_1 - xO films measured at room temperature
by spectroscopic ellipsometry (SE) on the wavelength 632.8~nm are
systematically decreased with the increasing of Mg content. Optical
band gaps of Mg_xZn_1 - xO films are determined by the
transmittance spectra. With increasing Mg content, the
absorption edges of Mg_xZn_1 - xO films shift to higher
energies and band gaps linearly increase from 3.24~eV at x=0 to
3.90~eV at x =0.30. |
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Keywords: | semiconductor thin films alloys optical properties |
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