Fast Photoconductivity in Self-Assembled Columnar Liquid Crystalline Photorefractive Materials

摘要

We have elaborated a novel strategy for the self-assembly and co- assembly of functional supramolecular columns that self-organize in a hexagonal columnar liquid crystalline phase forming high carrier mobility organic semiconductor materials for applications in photorefractive and photovoltaic devices. Among our accomplishments are, (1) synthesis and elucidation of the structure of self-organizing dendron materials into a helical superstructure supporting an axial transport channel suggesting that structure and function can be separately tailored, (2) demonstration of high mobility carrier transport of nearly 10-2 cm2/Vs, (3) synthesis of robust glass forming self-organizing dendron materials, (4) control of ionization potential and electron affinity by synthetic methods using various donor and acceptor moeities, (5) demonstration of the photorefractive effect in appropriate composites, (6) demonstration of the photovoltaic effect in a nanostructured inorganic/organic composite cell, (7) elucidation of carrier generation and transport mechanisms in columnar and smectic liquid crystalline phases, and (8) high mobility carrier transport in polymer networks. Such arrays are applicable to devices spanning from single supramolecule to nanoscopic and to macroscopic scales including transistors, photovoltaics, photoconductors, photorefractives, light emissives, and optoelectronics.