Abstract: Pi-conjugated organic molecules and polymers now provide a set of well-performing semiconductors that support devices, including light-emitting diodes (LEDs) as used in smart-phone displays and lighting, field-effect transistors (FETs) and photovoltaic diodes (PVs). These are attractive materials to manufacture, particularly for large-area applications where they can be processed by direct printing, so that the cost of materials and processing can be very low. This practical success is made possible by breakthroughs in the understanding and engineering of the underlying semiconductor science. The physics of organic semiconductors is often controlled by large electron-hole Coulomb interactions and by large spin exchange energies. Management of excited state spin is fundamental for efficient LED and solar cells operation. I will discuss in particular recent progress in the control of emissive spin singlet excited states and non-emissive spin triplet excited states.
Speaker: Prof Sir Richard Friend FRS
Richard Friend is the Cavendish Professor of Physics in the University of Cambridge. He has developed the semiconductor physics of pi-conjugated organic polymers, and his research group has demonstrated that these materials can be used in wide range of semiconductor devices. He has co-founded a number of Cambridge start-up companies to exploit these developments.
Venue: G O Jones Lecture Theatre
Time: Friday 18 March, 4.15 - 5.15 p.m
Reception: The talk will be followed by a small reception, with wine and snacks, in the Museum area on the first floor.