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Proceedings Paper

Modified chloroaluminium phthalocyanine: an organic semiconductor with high photoactivity
Author(s): Jean-Pol Dodelet; Louis Gastonguay; George Veilleux; Robert G. Saint-Jacques; Roland Cote; Daniel Guay; Gerard Tourillon
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Paper Abstract

The crystalline structure of chloroaluminum phthalocyanine (ClAlPc) is modified upon contact with an acidic solution (pH equals 3) containing 0.1 M of salts like KCl, KBr, KClO3, KBrO3 or NaHSO3. This modification is labelled 'H type' on the basis of the film Q band shape. Even though the absorbances in the Q band region are the same for all the salts used in this work, the photoactivity of the transformed films varies greatly from one salt to another. Indeed, under 35 mW cm-2 white light illumination, short circuit photocurrents range from 0.25 mA cm-2 (NaHSO3) to 1.0 mA cm-2 (KCl) depending upon the salt used during the modification of ClAlPc. It is shown by electron diffraction, that transformations of the H type induce the same changes for all salts in the interplanar distances of the ClAlPc crystallites. It is probably the result of anion penetration into the film to compensate for the protonation of the macrocycles. This anion uptake in the ClAlPc structure is demonstrated by X-ray absorption in the case of KBr for which Br...C distances of 2.6 angstrom and Br...N distances of 4.2 angstrom are measured. The most photoactive H type transformations of ClAlPc are obtained in the presence of KCl, KBr and KClO3. They have a common point: a similar film morphology. For these salts, the long axis of the crystallites lies along a direction parallel to the substrate surface while it was perpendicular before the transformation. After the H-type modification with NaHSO3, the film morphology is similar to the one of the as-sublimed ClAlPc. NaHSO3 transformed films display the lowest photoactivity even if the crystallinity of those films is comparable, if not better, than the crystallinity of ClAlPc transformed with KCl.

Paper Details

Date Published: 1 March 1991
PDF: 12 pages
Proc. SPIE 1436, Photochemistry and Photoelectrochemistry of Organic and Inorganic Molecular Thin Films, (1 March 1991); doi: 10.1117/12.45112
Show Author Affiliations
Jean-Pol Dodelet, INRS-Energie (Canada)
Louis Gastonguay, INRS-Energie (Canada)
George Veilleux, INRS-Energie (Canada)
Robert G. Saint-Jacques, INRS-Energie (Canada)
Roland Cote, Concordia Univ. (Canada)
Daniel Guay, Univ. Paris-Sud (France)
Gerard Tourillon, Univ. Paris-Sud (France)

Published in SPIE Proceedings Vol. 1436:
Photochemistry and Photoelectrochemistry of Organic and Inorganic Molecular Thin Films
Marcus F. Lawrence; Arthur Jesse Frank; S. Ramasesha; Carl C. Wamser, Editor(s)

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