Development of Radiation Hard Particle Detectors Made of Czochralski Grown Silicon

Abstract

Tracking detectors to be used in the future high-luminosity particle physics experiments have to be simultaneously radiation hard and cost e cient. Magnetic Czochralski silicon wafers can be grown with su ciently high resistivity (several kΩ cm) and well-controlled high oxygen concentration. Signi cant research and development activity aiming to develop particle detectors made of high resistivity magnetic Czochralski silicon has been ongoing during the past decade. Beam test results presented in this paper show that n-type magnetic Czochralski silicon strip detectors can be operated with acceptable signal-to-noise ratio at least up to a 1 MeV neutron equivalent (neq) uence of 1 × 10 cm−2. The improved radiation hardness, compared to more commonly used oat zone silicon, can be explained by the more bene cial electric eld distribution inside the detector bulk. We have demonstrated a S/N of > 10 for full-size strip detectors attached to readout electronics at a uence of 1 × 10 neq/cm. These ndings are supporting our transient current technique measurements.