Electrical characterization of irradiated prototype silicon pixel sensors for BTeV

The pixel detector in the BTeV experiment at the Tevatron (Fermilab) provides high-resolution tracking and vertex identification. For this task, the hybrid pixel detector has to work in a very harsh radiation environment with 10¹⁴ minimum ionizing particles/cm²/year. Radiation hardness of prototype n⁺/n/p⁺ silicon pixel sensors has been investigated. We present electrical characterization curves for irradiated prototype n⁺/n/p⁺ sensors, intended for use in the BTeV experiment. We tested pixel sensors from various vendors and with two pixel isolation techniques: p-stop and p-spray. Results are based on irradiation with 200 MeV protons up to 6×10¹⁴ protons/cm².