Nanofabrication of Organic/Inorganic Hybrids of TiO₂ with Substituted Phthalocyanine or Polythiophene

Authors: Hanming Ding¹; Manoj Kumar Ram¹; Claudio Nicolini¹

Source: Journal of Nanoscience and Nanotechnology, Volume 1, Number 2, June 2001 , pp. 207-213(7)

Publisher: American Scientific Publishers

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Abstract:

Organic photovoltaic cells, similar to Grätzel type, have been widely investigated in recent years. In the case of Grätzel-type cells, TiO₂ colloids are usually spin-coated onto an electrode and then sintered. Later, such electrodes are immersed in dye solution to sensitize the TiO₂ layer for fabrication of photovoltaic cells. In the current study, an attempt was made to fabricate photovoltaic cells using a layer-by-layer technique. Based on such a method, ordered substituted phthalocyanine or conducting polythiophene-sensitized TiO₂ multilayers were fabricated at the molecular level. Buildup of multilayer films of copper phthalocyanine-capped TiO₂ and poly(thiophene-3-acetic acid)/TiO₂ was monitored by increments in the UV-visible absorption and the frequency decrease of quartz crystal microbalance. The ordered multilayers were further characterized by infrared spectroscopy, and electrochemical and photoelectrochemical measurements.

Keywords: TITANIUM DIOXIDE; PHTHALOCYANINE; POLYTHIOPHENE; NANOCOMPOSITE; LAYER-BY-LAYER; ELECTROCHEMISTRY

Document Type: Research article

DOI: 10.1166/jnn.2001.031

Affiliations: 1: Department of Biophysical M&O Sciences and Technologies, Genoa University, Corso Europa 30, 16132 Genoa, Italy