Berlin 2012 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 6: Poster: Structural Ordering and Electronic Transport (joint focus with HL)
CPP 6.15: Poster
Monday, March 26, 2012, 17:30–19:30, Poster A
Increase in performance of polymer based field effect transistors with dielectric nanoparticles — •Ali Veysel TUNC1, Jürgen Parisi1, and Elizabeth von Hauff2 — 1University of Oldenburg, Department of Physics, Energy and Semiconductor Research Laboratory (EHF) Carl-von-Ossietzky Str.9-11, 26129 Oldenburg, Germany — 2Institute of Physics, University of Freiburg, Germany
We have investigated the effect of nanomorphologic manipulation by SiO2 nanoparticles and PCBM [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) in poly [2-methoxy,5-(3',7'-dimethyl-octyloxy)]-p-phenylene vinylene (MDMO-PPV) based field effect transistors. PCBM has already been observed to improve hole mobility when added to the polymer. The explanation of this improvement with PCBM is still controversial in the literature. We investigate the effect of conducting and insulating nanomaterials (SiO2 and PCBM) on the transport properties of PPV based field effect transistors. Scanning electron microscopy (SEM) is used to image the morphologies of the blends. We observe that both PCBM and SiO2 nanoparticles lead to an increase in the hole current and effect mobility, and additionally reduce the contact resistance and the threshold voltage. We discuss these improvements in terms of improved chain ordering and conformation. To confirm this, we additionally investigate the influence of SiO2 nanoparticles in blends prepared with PPVs of varying molecular weight. We demonstrate that using SiO2 nanoparticles then can be a simple and cost effective method to improve the performance in polymer based OFETs.