We investigated the charge collection properties of a polycrystalline CVD diamond detector in a temperature range from -10 to 80 C, by means of a 90Sr minimum ionizing β radiation source. The sample is a state-of-the-art diamond sensor yielding a maximum charge collection distance of 260 um at room temperature and 1 V/um applied field, when set in the so called pumped state, i.e., after passivating the deep traps with a pre-irradiation with β particles. We observed a decreasing charge collection distance with increasing temperature, which is a trend opposite to that reported recently by other research groups. We ascribe this discrepancy to the higher quality of our detector, in terms of a lower concentration of defects and grain boundaries. Conversely, we observe a less dramatic temperature dependence which we tentatively explain assuming a combined effect of variation with temperature of the thermal velocity and of the capture cross-section, according to a well known model of multi-phonon non-radiative processes.
Influence of temperature on the response of high-quality polycrystalline diamond detectors / R. D'ALESSANDRO; F. HARTJES; S. LAGOMARSINO ; S. SCIORTINO. - In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT. - ISSN 0168-9002. - STAMPA. - 570:(2007), pp. 303-307. [doi:10.1016/j.nima.2006.09.030]
Influence of temperature on the response of high-quality polycrystalline diamond detectors
D'ALESSANDRO, RAFFAELLO;LAGOMARSINO, STEFANO;SCIORTINO, SILVIO
2007
Abstract
We investigated the charge collection properties of a polycrystalline CVD diamond detector in a temperature range from -10 to 80 C, by means of a 90Sr minimum ionizing β radiation source. The sample is a state-of-the-art diamond sensor yielding a maximum charge collection distance of 260 um at room temperature and 1 V/um applied field, when set in the so called pumped state, i.e., after passivating the deep traps with a pre-irradiation with β particles. We observed a decreasing charge collection distance with increasing temperature, which is a trend opposite to that reported recently by other research groups. We ascribe this discrepancy to the higher quality of our detector, in terms of a lower concentration of defects and grain boundaries. Conversely, we observe a less dramatic temperature dependence which we tentatively explain assuming a combined effect of variation with temperature of the thermal velocity and of the capture cross-section, according to a well known model of multi-phonon non-radiative processes.I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.