electronic spectroscopy and molecular photophysics of oligomers and polymers

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For more than a decade, our group has been making synthetic photoconductors and semiconductors aimed at being used in the photoscience based technology.We are seeking new ways to use photoinduced electron transfer chemistry to make new photoactive and electroactive materials.Our research program is guided by the following questions:  What fundamental factors control the electronic properties observed on molecular and polymeric organic semiconductors and their charge transport in solution and in the solid state?How can these factors be manipulated to obtain new useful products?How can the new knowledge be used to develop material and devices such as organic field-effect transistors and photovoltaic (solar) cells?Our group of reseachers are employing a combination of spectroscopic techniques and theoretical approaches to gain a quantitative understanding of the relationship that exists between the conformation of an oligomer and its spectral properties. This understanding will guide the development of more efficient light-driven transistors and solar cells.  These optical effects are driven by a delicate balance between repulsive intrachain steric interactions and attractive interchain interactions (agregation).The agregation of these oligomers will be studied in solutions (mixtures of good/bad solvents) and as films. A systematic picture of the relationship between agregate structure and electronic properties will emerge from these studies.These fundamental studies have profound technological relevance.  Indeed, these materials have already been used in the development of new devices in micro-electronics, in electrochromic materials and in electroluminescent diodes and sensors.