Trapping of Charge Carriers in Organic Molecular Materials: Phthalocyanine Thin Films Revisited
I. Zhivkova, S. Nespurekb and J. Sworakowskic
aCentral Laboratory of Photoprocesses, Bulgarian Academy of Sciences, G. Bonchev, Str., bl. 109, 1040 Sofia, Bulgaria
bInstitute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic and Faculty of Chemistry, Technical University of Brno Purkynova 118, 612 00 Brno, Czech Republic
cInstitute of Physical and Theoretical Chemistry, Technical University of Wroc³aw, Wyb. Wyspiańskiego 27, 50-370 Wroc³aw, Poland
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Received: November 14, 2001
The technique of temperature-modulated space-charge-limited currents was employed to study the energetic distribution of local states in thin films of metal-free phthalocyanine. Four well-defined local levels were detected within the energy range 0.5--0.3 eV, accompanied by an onset to a manifold of shallower states. The morphology of the films, depending on the deposition rate and changing from polycrystalline to nearly amorphous, affects the densities of local states but not their energies.
DOI: 10.12693/APhysPolA.100.215
PACS numbers: 71.20.Rv, 72.20.Jv, 72.80.Le, 73.61.Ph