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Influence of temperature on the response of diamond radiation detectors

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7 Author(s)
Tromson, D. ; LETI (CEA–Technologies Avancées)/DEIN/SPE, CEA/Saclay, 91191 Gif-sur-Yvette, France ; Brambilla, A. ; Bergonzo, P. ; Mas, A.
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The response of chemically vapor deposited diamond detectors under alpha particle irradiation was studied as a function of operating temperature in the 20–280 °C range. The detector characteristics were studied for two initial states: (i) the detector being either preirradiated under x-rays at a dose of 8 Gy (pumped state) or (ii) preannealed at 400 °C for 15 min (depumped state). Pumped detectors were found to exhibit a stable response (evaluated by measurement of the charge collection efficiency η) with temperature up to 120 °C, above which a decrease of η was observed. Preannealing at 400 °C was shown to induce, at room temperature, a drastic deterioration of the detector response, when compared to that of pumped devices, whereas above 150 °C a reversed trend was observed. Correlations between the response of the diamond detectors and the presence of traps were determined by comparing the detector response for α particles with the thermally stimulated current (TSC) spectrum. The temperature dependence of the detector response was shown to be related to the presence of a trapping level measured around 260 °C by TSC. © 2001 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:90 ,  Issue: 3 )

Date of Publication:

Aug 2001

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