Investigation on polycrystalline CVD diamond-based alpha-particle detectors

In this paper, α-particle detectors have been fabricated using good quality polycrystalline CVD diamond thin films deposited by HFCVD technique. Coplanar electrical contacts with interelectrode spacing of 100 μm were prepared on the growth side of the CVD diamond film using lift-off technology. The detector performance has been tested with a 241Am source with a characteristic energy of 5.5 MeV at room temperature. The experimental results show that the charge collection efficiency of the fabricated CVD diamond-based α-particle detector in the normal state reaches 32%.