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. 2014 Sep 17;14(9):17406–17429. doi: 10.3390/s140917406

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© 2014 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 6. — (a) Channel current vs. gate voltage under different oxygen pressures. (b) Curve 1 was obtained under ultraviolet illumination with an oxygen pressure of 10⁵ Pa. Curve 2–9 were obtained 1, 3, 5, 6, 9, 14, 20, 26 min after turning of the ultraviolet light, respectively. In these measurements, the bias voltage is 2 V. Reprinted from reference [86] with permission from AIP Publishing.