Self-Assembly of Conjugated Polymers for Organic Electronics
Speaker: Lilo Pozzo, University of Washington
Department: Chemical & Biological Engineering
Location: Engineering Quadrangle A224
Date/Time: Wednesday, February 19, 2014, 4:00 p.m. - 5:00 p.m.
Conjugated polymers are shown to self-assemble in organic solvents forming fibers and branching networks that could be ideal structures for efficient photovoltaic devices and organic electronic applications. The temperature-induced sol-gel transition of these semiconductor materials is shown to directly correlate with large changes in optical, electronic and mechanical properties. This presentation outlines recent work using combined small angle neutron scattering experiments (rheology-SANS and dielectric-SANS) that have contributed to increasing our understanding of the nanoscale processes that control the formation and dissolution of these unique polymer networks. Processing of semiconductor organogels as emulsion dispersions has also been demonstrated and prototype solar cell devices have been fabricated from networked materials. These results and the prospects of using self-assembly to produce organic solar cells and other electronic devices will also be discussed.