Levich Institute Seminar Announcement, 09/22/2009
Steinman Hall, Room #312
(Chemical Engineering Conference Room)
Professor Michael Mackay
University of Delaware
Department of Materials Science and Engineering
"Polymer-Based Solar Cells - What is the Morphology in the Device and How Does this Influence Performance?""
Polymer – based solar cell technology is in its infancy showing great promise due to ease of fabrication, mechanical flexibility, light weight and low cost. However, the photovoltaic device efficiency using semi-conducting polymers is small and determined by morphology control over two disparate nano-length scales, ~ 10 nm and ~ 100 nm, necessitating advanced measurement science. Interestingly neutron scattering is the best non-destructive technique to use because the components have natural contrast to neutrons and it has an appropriate wavelength to quantify the morphology. In this seminar I will discuss the type of morphology present in the bulk heterojunction by using neutron reflectivity, grazing incidence neutron scattering and in-plane neutron scattering, as well as other characterization techniques. Suggestions as to how to improve the morphology and cell performance will also be given.
BRIEF ACADEMIC/EMPLOYMENT BACKGROUND:
Nanocomposites and Polymer Based Solar Cells