Improving the radiation hardness properties of silicon detectors using oxygenated n-type and p-type silicon

The degradation of the electrical properties of silicon detectors exposed to 24 GeV/c protons were studied using pad diodes made from different silicon materials. Standard high grade p-type and n-type substrates and oxygenated n-type substrates have been used. The diodes were studied in terms of reverse current (I_r) and full depletion voltage (V_fd) as a function of fluence. The oxygenated devices from different suppliers with a variety of starting materials and techniques, all show a consistent improvement of the degradation rate of V_fd and CCE compared to un-oxygenated substrate devices