Photocarrier generation processes of phthalocyanines studied by photocurrent and electroabsorption measurements

We have studied the photocarrier generation processes of copper, oxotitanium, and [tau]-metal-free phthalocyanines (Pcs) by measuring the temperature dependence of transient photocurrent, lifetime of precursor of free carrier, and electroabsorption spectra. No distinct correlation was observed betwe...

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Bibliographic Details
Published in:Journal of physical chemistry (1952) 1993-07, Vol.97 (30), p.8026-8031
Main Authors: Saito, Toshiro, Sisk, Wade, Kobayashi, Toshiyuki, Suzuki, Shigeo, Iwayanagi, Takao
Format: Article
Language:English
Subjects:
400400 > Electrochemistry
400500 > Photochemistry
ACTIVATION ENERGY
COHERENT SCATTERING
COMPLEXES
Condensed matter: electronic structure, electrical, magnetic, and optical properties
COPPER COMPLEXES
DIFFRACTION
DYES
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport phenomena in thin films and low-dimensional structures
ENERGY
Exact sciences and technology
HETEROCYCLIC COMPOUNDS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
ORGANIC COMPOUNDS
PHOTOELECTROMAGNETIC EFFECTS
PHOTOVOLTAIC EFFECT
PHTHALOCYANINES
Physics
SCATTERING
SOLAR ENERGY
TEMPERATURE DEPENDENCE
TITANIUM COMPLEXES
TRANSITION ELEMENT COMPLEXES 140501 > Solar Energy Conversion-- Photovoltaic Conversion
X-RAY DIFFRACTION
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Summary:We have studied the photocarrier generation processes of copper, oxotitanium, and [tau]-metal-free phthalocyanines (Pcs) by measuring the temperature dependence of transient photocurrent, lifetime of precursor of free carrier, and electroabsorption spectra. No distinct correlation was observed between the photocurrent activation energy and the charge generation efficiency. The lifetimes of some Pcs with different charge generation efficiencies had little difference. In phase II and Y-form oxotitanium Pc (TiOPc), electroabsorption signals assignable to CT exciton bands could be observed, while in amorphous TiOPc only the Frenkel exciton band was observed. The phase II and Y-form TiOPc showed much higher photoconductivities than the amorphous one. These results indicated that the nature of the excited states, namely the strength of the CT interaction, should dominate the free carrier generation efficiency in the photocarrier generation processes of Pcs. 14 refs., 8 figs.
ISSN:0022-3654
1541-5740
DOI:10.1021/j100132a036