Accession Number : AD0701452

Title :   STUDIES ON THE CONDUCTIVITY PROPERTIES OF ORGANIC SOLIDS,

Corporate Author : FRANKLIN INST RESEARCH LABS PHILADELPHIA PA

Personal Author(s) : Reucroft,Philip J. ; Hillman,Eugene E.

Report Date : DEC 1969

Pagination or Media Count : 35

Abstract : Charge-carrier trapping properties of aromatic molecular crystals have been investigated by thermally stimulated current and space charge limited current techniques. Thermally stimulated current studies on melt-grown, vapor-grown and irradiated melt-grown anthracene crystals in the temperature range 100K to 300K show minor differences in trapping behavior indicating that trapping phenomena involving dislocations and radiation induced impurities are not being measured in this temperature range by this technique. A thermally stimulated current peak is found in melt-grown chrysene crystals and vapor-grown tetracene crystals which is similar to that found in the anthracene crystals. The results suggest that a physical defect, as yet uncharacterized, which is present in all these crystals is probably responsible for the thermally stimulated current behavior in the temperature range studied. Thermally stimulated current studies on chrysene crystals with blocking and non-blocking electrodes indicate that injection of carriers through the metal electrode may be causing increased population of traps and shifting the trap depth to higher values. A hole injecting solution contact (AlCl3: anthracene in nitromethane) is found to function more efficiently with an anthracene crystal than an analogous solid contact obtained by evaporating the solvent to dryness. (Author)

Descriptors :   (*POLYCYCLIC COMPOUNDS, *CARRIERS(SEMICONDUCTORS)), (*ANTHRACENES, ELECTRICAL CONDUCTIVITY), AROMATIC COMPOUNDS, CRYSTAL DEFECTS, IMPURITIES

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE