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Projects: Supported by
Petroleum Research Fund PI: Prof. Kenneth
Singer ABSTRACT: The objective of
our proposed research is the experimental and theoretical study of
mechanisms of electronic transport, surface charge injection and
photogeneration in smectic and columnar discotic liquid crystals (LCs) in
order to guide the design, synthesis and construction of improved organic
semiconductor devices such as light emitting diodes, photovoltaic devices,
photorefractives, sensors and thin film transistors. Electronic transport
in LCs is a new challenging field of fundamental research, which bridges
the understanding of charge transport phenomena in molecular single
crystals and amorphous disordered solids. Having a high electronic
mobility (up to We propose to
employ various methods, including time-of-flight, xerographic discharge,
laser surface photovolatge spectroscopy, electroabsorbtion spectroscopy,
and Kelvin probe measurements to investigate mechanisms of transient and
DC photoconductivity, charge photogeneration, trapping, recombination and
injection processes in order to establish the relationship between
macroscopic properties and microscopic molecular order and alignment in
LCs. Our theoretical focus is to develop a comprehensive theory of
anisotropic electronic transport and photogeneration in 1D and 2D LCs
accounting for the dynamic character of transport and trapping sites. |
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Organic
Optoelectronics Laboratory |
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