Single crystal diamond photodiode for soft X-ray radiometry

Method is presented to obtain current-mode responsivity from diamond photodiode in the soft X-ray range (0.25–7 keV). Pulsed bias and blocking contacts are used to mitigate artifacts of charge trapping and photoconductive gain. Mean electron-hole pair creation energy is measured from experimental data to be 13.25±0.5 eV. Responsivity of diodes made from commercially available 500 μm thick single-crystal diamond (under conditions described) is reported.