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Probing The Transient Response To Improve The Stability Of Diamond Devices Under Pulsed Periodic Excitation

Published online by Cambridge University Press:  01 February 2011

Philippe Bergonzo ,
Hassen Hamrita ,
Dominique Tromson ,
Caroline Descamps ,
Christine Mer  and
Milos Nesladek
Philippe Bergonzo
Affiliation:
[email protected], Laboratoire Capteurs Diamant, CEA, LIST,, Centre d'Etudes de Saclay, Gif-sur-Yvette, 91191, France, +33169084053, +33169087679
Hassen Hamrita
Affiliation:
[email protected], Laboratoire Capteurs Diamant, CEA, LIST,, Centre d'Etudes de Saclay, Gif-sur-Yvette, 91191, France
Dominique Tromson
Affiliation:
[email protected], Laboratoire Capteurs Diamant, CEA, LIST,, Centre d'Etudes de Saclay, Gif-sur-Yvette, 91191, France
Caroline Descamps
Affiliation:
[email protected], Laboratoire Capteurs Diamant, CEA, LIST,, Centre d'Etudes de Saclay, Gif-sur-Yvette, 91191, France
Christine Mer
Affiliation:
[email protected], Laboratoire Capteurs Diamant, CEA, LIST,, Centre d'Etudes de Saclay, Gif-sur-Yvette, 91191, France
Milos Nesladek
Affiliation:
[email protected], Laboratoire Capteurs Diamant, CEA, LIST,, Centre d'Etudes de Saclay, Gif-sur-Yvette, 91191, France
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Abstract

CVD diamond combines attractive properties for the fabrication of detection devices operating in specific environments. One problem that remains critical for device stability is the presence of defect levels that alter the detection performances, and the detection characteristics often appear as they are very depending on time, temperature, and history of the preceding irradiations.

One issue we have proposed is to adapt one technique that is commonly used for time of flight spectroscopy in order to maintain a uniform electric field in the probed device, and based on the synchronisation of the device bias with the period of the excitation source. This can be applied to several types of detection applications, as long as we can rely on periodical triggering in order to synchronise the device polarisation. We apply it here to a LINAC electron accelerator used for photon pulse generation at the frequency of 25Hz. The result is a remarkable improvement of the performance of a polycrystalline diamond detector that exhibits a particularly defective response when used in the steady state excitation, to reach that of a perfectly stable and reproducible device response in the pulsed mode. We claim this method to be applicable to several types of excitations and particularly to present a high interest for monitoring accelerator sources, e.g. for medical dosimetry applications.

Keywords

diamonddevicesdefects
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1039: Symposium P – Diamond Electronics–Fundamentals to Applications II , 2007 , 1039-P06-01
Copyright
Copyright © Materials Research Society 2008

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References

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