Title :
Spectroscopic response of coplanar diamond alpha particle detectors
Author :
Sellin, Paul J. ; Breese, Mark B H
Author_Institution :
Dept. of Phys., Surrey Univ., Guildford, UK
Abstract :
The performance of a chemical-vapor deposited (CVD) diamond radiation detector with an interdigitated coplanar electrode geometry is reported. The coplanar structure produces a shallow lateral electric field distribution. Consequently, charge transport occurs in a region close to the growth surface of the CVD diamond film, where the drift lengths are maximized. The spectroscopic performance of the coplanar diamond detector was investigated using alpha particles from a /sup 241/Am source, and also using a scanning 2-MeV proton microprobe. A broad full energy peak was observed using 5.49-MeV alpha particles, with an overall charge-collection efficiency of approximately 16% at a bias voltage of 300 V. The performance of this device is discussed with reference to Monte Carlo simulations of charge transport in coplanar electrode geometries.
Keywords :
Monte Carlo methods; alpha-particle detection; carrier lifetime; diamond; elemental semiconductors; semiconductor counters; semiconductor thin films; /sup 241/Am; 2 MeV; 300 V; 5.49 MeV; C; CVD diamond film; Monte Carlo simulations; alpha particle source; bias voltage; broad full energy peak; charge transport; charge-collection efficiency; chemical-vapor deposition; coplanar diamond alpha particle detectors; drift lengths; growth surface; interdigitated coplanar electrode geometry; scanning proton microprobe; shallow lateral electric field distribution; spectroscopic response; Alpha particles; Charge carrier processes; Chemical vapor deposition; Crystalline materials; Crystallization; Electrodes; Geometry; Radiation detectors; Spectroscopy; Substrates;
Journal_Title :
Nuclear Science, IEEE Transactions on
