Single-crystal CVD diamond detector for low-energy charged particles with energies ranging from 100 keV to 2 MeV

The performance of a diamond detector made of a single-crystal diamond grown by chemical vapor deposition was studied for charged particles, having energies ranging from 100 keV to 2 MeV. Energy peaks of these low-energy ions were clearly observed. However, we observed that the pulse height for individual incident ion decreases with increasing atomic number of the ions. We estimated the charge collection efficiency of the generated charge carriers by charged particle incident. The charge collection above ~95% is achieved for helium (He⁺) with the energy above 1.5 MeV. On the other hand, the charge collection efficiency for heavy-ions shows lower values compared with that of He⁺, ~70% for silicon (Si⁺) and ~30% for gold (Au³⁺), at the same incident energy range, respectively.