Development of InP detector for pp/ 7Be solar neutrino measurement

A radiation detectors used a semi-insulating Indium Phosphide (InP) wafer for measurement of solar pp/7Be neutrinos have been developed in last a few years. A volume of the detector has achieved to 7mm3. This detector observed γ-rays, and measured a peak for the photoelectric effect at -79 deg. C. The charge collection is mainly done by a carrier drift along to the electric field at outside of depletion layer, and the efficiency is achieved by 60 to 70%