Evaluation of InP:Ti and InP:Mn and its use for particle detectors

Semi-insulating and semiconducting InP single crystals without intentional doping and doped with Fe, co-doped with Zn and Ti and doped with Mn were grown by Czochralski technique. Samples cut from these crystals were characterized by Hall effect measurements and DLTS. Two electron traps were found in undoped InP which concentration was suppressed in Mn doped InP. Binding energies of Fe, Ti and Mn deep level impurities were determined from the temperature dependent Hall effect measurements. The curves of Hall coefficient vs. reciprocal temperature decline from straight lines at low temperatures for InP:Fe and for InP:Ti samples due to electron and hole mixed conductance. The value of resistivity reaches about 10/sup 6/ /spl Omega/m at 230 K and 100 K for InP:Ti and InP:Mn, respectively, the value suitable for using these materials for designing particle detectors operating at the low temperatures.