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Title: Semi-transparent SiC Schottky diodes for x-ray spectroscopy
Authors: Lees, J. E.
Bassford, D. J.
Fraser, G. W.
Horsfall, A. B.
Vassilevski, K. V.
Wright, N. G.
Owens, A.
First Published: Jul-2007
Publisher: Elsevier
Citation: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2007, 578, pp.226-234.
Abstract: We describe a novel SiC Schottky diode architecture. The semi-transparent SiC Schottky diode has an “ultra-thin” (18 nm Ni/Ti) Schottky contact, a gold annular overlayer and a gold corner-contact pad. We show that the new architecture exhibits the same essential characteristics as a more conventional ‘thick-contact’ Schottky diode (≥100nm). Such diodes will have a higher efficiency for low energy (< 5 keV) X-rays than that of conventional structures combined with minimal self-fluorescence from the electrode materials. We present X-ray spectra from 55Fe, 109Cd and 241Am radioactive sources that show these diodes can be used for spectroscopy with promising energy resolution (1.47 keV FWHM at 22 keV) at room temperature (23ºC). The reduction in contact thickness, however, does reduce the barrier height of the new diodes in comparison to those fabricated using the conventional process, and requires a trade-off between the low energy detection threshold and the noise in the detector.
DOI Link: 10.1016/j.nima.2007.05.172
Type: Article
Rights: This is the author's draft of an article published by Elsevier in the Nuclear Instruments and Methods in Physics Research journal.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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