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The Effect of Low-Temperature Annealing on a CdZnTe Detector
Kim, K. H.,Hwang, Seokjin,Fochuk, Petro,Nasi, L.,Zappettini, Andrea,Bolotnikov, A. E.,James, R. B. Professional Technical Group on Nuclear Science 2016 IEEE transactions on nuclear science Vol.63 No.4
<P>It is known that low temperature annealing at below 200 degrees C decreases the leakage current in a CdTe and CdZnTe (CZT) detector. However, only CZT detectors which have electrodes made by electroless method and low temperature annealing in the air showed diminished leakage current after annealing. With the aid of an in-situ annealing monitoring system, we measured the leakage current of a CZT detector while carrying out low-temperature annealing. A decrease in the leakage current resulted from the presence of thin insulating Te oxide layers, TeO2 and CdTeO3, instead of CZT/electrode interface enhancement by diffusion of Au. Other measurement results of Auger electron spectroscopy, micro TEM analysis, and pulse height spectrum were in good agreement with our new interpretation of the low temperature annealing effects of CZT.</P>
Calestani, D,Culiolo, M,Villani, M,Delmonte, D,Solzi, M,Kim, Tae-Yun,Kim, Sang-Woo,Marchini, L,Zappettini, A IOP 2018 Nanotechnology Vol.29 No.33
<P>The physical and operating principle of a stress sensor, based on two crossing carbon fibers functionalized with ZnO nanorod-shaped nanostructures, was recently demonstrated. The functionalization process has been here extended to tows made of one thousand fibers, like those commonly used in industrial processing, to prove the idea that the same working principle can be exploited in the creation of smart sensing carbon fiber composites. A stress-sensing device made of two functionalized tows, fixed with epoxy resin and crossing like in a typical carbon fiber texture, was successfully tested. Piezoelectric properties of single nanorods, as well as those of the test device, were measured and discussed.</P>