2016 Materials science lecture series: advanced materials - 6 October 2016
Oct 06, 2016 - 11.00 uur
Agoralaan Gebouw D
Lokaal Aula H2
de heer Rajesh RAMANETI
Speaker: Prof. Christine Luscombe - Dept. of Materials Science and Engineering, University of Washington, Seattle, USA.
Topic: Precise engineering of semiconducting polymers and their hybrids for organic electronics.
Chaired by: Prof. Dr. Thomas Junkers & Prof. Dr. Wouter Maes, IMO-IMOMEC, Hasselt University
Thursday 6 October 2016, 11:00 -12:00
Aula H2, building D, Hasselt University, Campus Diepenbeek.
p-Conjugated polymers are being used in the fabrication of a wide variety of organic electronic devices such as organic field-effect transistors (OFETs), organic photovoltaic (OPV) devices, and organic light-emitting diodes(OLEDs). Since the seminal work on the conductivity of polyacetylene by Heeger, MacDiarmid, and Shirakawa was published in 1970s, the field of organic electronics has grown exponentially. Our group has been studying and developing techniques to grow semiconducting polymers using a living polymerization method. This has allowed us to synthesize polymer architectures that we haven’t been able to access till now including polythiophene brushes, star-shaped P3HT, as well as hyperbranched P3HT. It also allows us to accurately control the molecular weights of P3HT and produce materials with a narrow molecular weight distribution. Our unique synthetic capabilities allows us to specifically control defects in these polymers. Our work in controlling polymer defects and their effect on microstructure and thus optoelectronic properties will be presented.
More recently, we have extended extended our ability to control and understand understand polymer structures to hybrid systems as well.The aliphatic ligands that are used to solubilize and stabilize the nanocrystals operate as a significant source of carbon impurities that are incorporated into the final device. Despite the ubiquity of this technique and the fact that carbon defects have been reported to be found across a spectrum of devices, the structure, properties and influence of the carbon on PV device performance remain relatively unexplored. Our findings show that, depending on the ligand, the carbon impurities may be beneficial to the performance of devices.