Accession Number : AD0478736


Title :   TRANSIENT CURRENT MEASUREMENTS IN PHTHALOCYANINE, AN ORGANIC SEMICONDUCTOR.


Descriptive Note : Technical rept.,


Corporate Author : PRINCETON UNIV NJ SOLID STATE ELECTRONICS LAB


Personal Author(s) : Westgate, C R ; Warfield, G


Report Date : Jan 1966


Pagination or Media Count : 55


Abstract : Using a transient space charge limited current technique and a crystal counter technique, the drift mobilities in the c* direction of metal free and lead phthalocyanine single crystals were determined. Mobilities in the range 0.05-0.1 sq cm/V-sec. in metal free phthalocyanine and 0.6-4.0 sq cm/V-sec. in lead phthalocyanine were observed for both electrons and holes. Definite values of the mobilities and the temperature dependences of the mobilities could not be found from the cusp in the transient space charge limited current technique because of the characteristics of the crystals that were available; namely, small size, severe trapping, and fast recombination in the photogenerated contact. The mobilities were calculated from the initial currents injected. Traps with a density of 10 to the 14th power cu/cm and an activation energy of 0.36 eV were found in both lead and metal free phthalocyanine crystals. These trap characteristics were determined by thermally stimulated trap emptying measurements. These traps were responsible for the fast and severe trapping of carriers observed in the transient current measurements. (Author)


Descriptors :   *SEMICONDUCTORS , *PHTHALOCYANINES , *BAND THEORY OF SOLIDS , MOLECULAR ORBITALS , SINGLE CRYSTALS , SPACE CHARGE , LIMITERS , CRYSTAL COUNTERS , ELECTRON TRANSITIONS , VOLTAGE , CHARGE CARRIERS , OPERATORS(MATHEMATICS) , TRANSIENTS , CRYSTAL DEFECTS , CAPACITANCE , ELECTRONS , PHONONS , TEMPERATURE , MOLECULAR ENERGY LEVELS , CRYSTAL GROWTH , GATES(CIRCUITS) , ELECTRICAL CONDUCTIVITY , PERTURBATION THEORY , RESONANCE , INTEGRAL EQUATIONS


Subject Categories : Crystallography
      Solid State Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE