Microwave CVD diamond films with very high particle detection efficiency have been obtained using a NIRIM-type reactor. The efficiency and charge collection distance (CCD) of nuclear particle detectors based on these films have been systematically studied as a function both of the methane contents in the growth gas mixture and of the film thickness. In particular, the effects of pre-irradiation with β-particles (pumping) have been thoroughly studied. The detector response to 5.5 MeV α particles was studied using a 241 Am source. Both efficiency and CCD behave in a markedly different way in the as-grown and pumped states, the effect of pumping being strongly dependent on film thickness. These behaviors are analyzed, taking into account the polycrystalline nature of CVD diamond films, in the framework of a recently proposed model [Appl. Phys. Lett. 75 (1999) 3216] discussing the role of in-grain defects and grain boundaries in determining the charge collection spectra of diamond films in the normal and pumped states. Experimental data are found to agree with what is expected from the model. The influence of pumping on the detector resolution is also discussed. © 2001 Elsevier Science B.V. All rights reserved.
Marinelli, M., Milani, E., Paoletti, A., Tucciarone, A., VERONA RINATI, G., Angelone, M., et al. (2001). Growth of detector grade CVD diamond films and microscopic interpretation of their efficiency and charge collection distance in the normal and pumped states. DIAMOND AND RELATED MATERIALS, 10(9-10), 1783-1787 [10.1016/S0925-9635(01)00449-6].
Growth of detector grade CVD diamond films and microscopic interpretation of their efficiency and charge collection distance in the normal and pumped states
MARINELLI, MARCO;MILANI, ENRICO;VERONA RINATI, GIANLUCA;
2001-01-01
Abstract
Microwave CVD diamond films with very high particle detection efficiency have been obtained using a NIRIM-type reactor. The efficiency and charge collection distance (CCD) of nuclear particle detectors based on these films have been systematically studied as a function both of the methane contents in the growth gas mixture and of the film thickness. In particular, the effects of pre-irradiation with β-particles (pumping) have been thoroughly studied. The detector response to 5.5 MeV α particles was studied using a 241 Am source. Both efficiency and CCD behave in a markedly different way in the as-grown and pumped states, the effect of pumping being strongly dependent on film thickness. These behaviors are analyzed, taking into account the polycrystalline nature of CVD diamond films, in the framework of a recently proposed model [Appl. Phys. Lett. 75 (1999) 3216] discussing the role of in-grain defects and grain boundaries in determining the charge collection spectra of diamond films in the normal and pumped states. Experimental data are found to agree with what is expected from the model. The influence of pumping on the detector resolution is also discussed. © 2001 Elsevier Science B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
