AVS 46th International Symposium
    Organic Electronic Materials Topical Conference Monday Sessions
       Session OE-MoP

Paper OE-MoP1
STM/Photo-Assisted EFM Investigation of Morphology-Photoconductivity Relationships in Photogenerating Dye Molecule Thin Films

Monday, October 25, 1999, 5:30 pm, Room 4C

Session: Poster Session
Presenter: M.E. Stawasz, Colorado State University
Authors: M.E. Stawasz, Colorado State University
N. Takeda, Colorado State University
B.A. Parkinson, Colorado State University
Correspondent: Click to Email
STM and photo-assisted EFM (Electric Force Microscopy) were used to study the relationship between morphology and photoconductivity for a photogenerating dye molecule used commercially in photoreceptor devices. Bis(4-dimethylamino-2-hydroxyphenyl) squaraine was adsorbed from solution onto the basal plane of HOPG. Several polymorphs of adsorbate structure were determined with STM. EFM coupled with a 0.5W 690nm diode laser to illuminate the sample surface was used to spatially resolve areas of differing polymorph in terms of their differing photoconductivity. By identifying regions of differing polymorph, then measuring the relative photoconductivities of each phase a polymorph structure-photoconductivity relationship was identified.