Organic Electronics at CSIRO: Materials, Devices and a Structure-Property Relationship Study on a Non-Linear Acene
CSIRO Materials Science and Engineering, Australia
December 11, 2012 at 10:00am
Ben Bandy Conference Center
UK Center for Applied Energy Research
Organic electronics using pi-conjugated materials have potential applications on flexible, light weight and transparent substrates. One key challenge for commercializing organic semiconductors lies in the low mobilities of these materials in comparison to amorphous silicon (~1 cm2/Vs). What is also lacking is a comprehensive knowledge of the fundamental chemical-structure and device electronics properties of organic semiconductors. The aim of our research in flexible electronics at CSIRO is to discover novel, high performance materials that can replace silicon based semiconductors for use in organic photovoltaics and organic thin film transistors.
The charge carrier mobility of organic semiconductors is dependent on the intermolecular interactions between neighbouring molecules in the solid state. For example, linear aromatic hydrocarbons, such as substituted pentacenes are well known to have enhanced 2D pi-pi interactions that have drastically improved charge transport properties over their molecular analogues that stack only in 1D. A preliminary structure-property relationship (SPR) of a non-linear system – the kinked dibenzo[b,def]chrysenes (DBC) - has been conducted and the SPR of DBCs have been found to be dissimilar to that of their linear counterparts. Through this SPR study, we have identified a novel high mobility non-linear acene that has field effect transistor mobility > 1 cm2/Vs. We anticipate that what we learned through this SPR study can be applied to the design of novel molecular templates for organic electronic applications.