期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 663, 期 -, 页码 262-269出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.12.112
关键词
Oxide semiconductor materials; Sputtering; Thin films
资金
- Ministry of Science and Technology of Taiwan, ROC [MOST 104-2221-E-224-050]
Copper oxide (CuxO) thin films were prepared by radio -frequency magnetron sputtering with a Cu2O target. The sputtering power was varied from 40 W to 80 W while the working pressures (WPs) were 3 -10 mtorr. Deposition rates, surface morphologies, carrier concentrations, carrier mobilities, optical characteristics, bandgaps and crystallinities of the deposited films were investigated. The preferential orientations of the films were Cu2O(111) and CuO(-111). A higher WP can lead to a significant increase in the Cu2O(111) phase and the size of the grain nanoclusters. A higher sputtering power can exhibit a higher hole mobility and a lower hole concentration. The average transmittances in the visible light range and optical bandgaps of the CuxO films were 33-50% and 2.6-2.7 eV. After a post annealing process at 300 degrees C for 1 h in air, the nanocluster size of the CuxO film prepared at the power of 80 W with WP of 5 mtorr can be increased from 40 nm to 70 nm. Meanwhile, a high mobility of 81.4 cm(2)/V s, a low hole concentration of 4.2 x 10(13) cm(-3), and a low density of states of 5 x 10(13) cm(-3)eV(-1) can be simultaneously obtained. Besides, a CuxO/ZnO heterojunction diode showing rectifying characteristic was fabricated to verify the semiconductor characteristic of the deposited p -type CuxO film. (C) 2015 Elsevier B.V. All rights reserved.
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