By a News Reporter-Staff News Editor at Journal of Technology -- Research findings on Sensor Research are discussed in a new report. According to news reporting originating in Conway, South Carolina, by VerticalNews journalists, research stated, "We present a phenomenological model for the photocurrent transient relaxation observed in ZnO-based metal-semiconductor-metal (MSM) planar photodetector devices based on time-resolved surface band bending. Surface band bending decreases during illumination, due to migration of photogenerated holes to the surface."
The news reporters obtained a quote from the research from Coastal Carolina University, "Immediately after turning off illumination, conduction-band electrons must overcome a relatively low energy barrier to recombine with photogenerated holes at the surface; however, with increasing time, the adsorption of oxygen at the surface or electron trapping in the depletion region increases band bending, resulting in an increased bulk/surface energy barrier that slows the transport of photogenerated electrons. We present a complex rate equation based on thermionic transition of charge carriers to and from the surface and numerically fit this model to transient photocurrent measurements of several MSM planar ZnO photodetectors at variable temperature. Fitting parameters are found to be consistent with measured values in the literature."
According to the news reporters, the research concluded: "An understanding of the mechanism for persistent photoconductivity could lead to mitigation in future device applications."
For more information on this research see: A phenomenological model for the photocurrent transient relaxation observed in ZnO-based photodetector devices. Sensors, 2013;13(8):9921-40. (Elsevier - www.elsevier.com; Sensors - www.elsevier.com/wps/product/cws_home/504103)
Our news correspondents report that additional information may be obtained by contacting J.C. Moore, Dept. of Chemistry and Physics, Coastal Carolina University, Conway, SC 29528, United States.
Keywords for this news article include: Conway, United States, South Carolina, Sensor Research, North and Central America.
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