Berlin 2008 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications
SYSA 3: Organic Devices I
SYSA 3.1: Hauptvortrag
Dienstag, 26. Februar 2008, 14:30–15:00, H 2013
Charge transport and contact effects in organic semiconductors — •Alberto Salleo1, Leslie Jimison1, Jonathan Rivnay1, Ludwig Goris1, and Michael Toney2 — 1Materials Science Department, Stanford University, Stanford CA 94305 — 2Stanford Synchrotron Radiation Laboratory, Menlo Park CA
The long-standing promise of organic electronics, i.e. the ability to design molecular materials at will, is complicated by the fact that one needs to predict the microstructure of the semiconductor from the molecular structure. Thus, in order to truly design novel semiconductors, one must understand how microstructure and transport are related. In polymeric semicrystalline semiconductors, mobility is well described by a multiple trapping and release model. The beneficial effect of annealing in poly(thiophenes) for instance can be understood as a tightening of the trap energy distribution. Regio-regularity on the other hand does not affect crystalline texture (i.e. intergrain coupling) or tail state distributions but only the crystalline mobility. Finally, the microstructure of the polymeric semiconductor plays a role in other device non-idealities. For instance, we will show that tailoring the microstructure of the polymer allows to eliminate a well-known non-ideality of short-channel TFTs (L<10 um) due to ambipolar injection at the drain contact.