STUDY OF PHOTOCONDUCTIVITY IN POLYCRYSTALLINE CADMIUM TELLURIDE.
STATE UNIV OF NEW YORK ALFRED COLL OF CERAMICS
Pagination or Media Count:
Polycrystalline samples of cadmium telluride were hot pressed from high purity materials over a range of temperatures at 3000 and 30,000 psi. Studies of the specimens were made in terms of their photoconducting properties, infrared transmission, resistivity, and carrier lifetimes. All samples possessed photoconductivity peak values which fell slightly below the band gap value of 1.5 eV reported for single crystal CdTe. Two low energy trapping levels were identified from the resistivity plots which correspond in energy to those identified with the single crystals. Carrier lifetimes showed a general increase with increasing pressing temperature and also pointed to the contribution of trapping to the band model. High pressure formed CdTe materials were found to approach single crystal properties for photoconductor and infrared transmission applications. Author