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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Organic Semiconductors

CPP 8.48: Poster

Monday, March 14, 2011, 17:30–19:30, P2

HTL based SAM-system with improved carrier injection — •Merve Anderson, Sylvia Gang, Benjamin Friebe, Björn Lüssem, and Karl Leo — IAPP, TU Dresden

Organic electronics have received an increasing interest due to their mechanical flexibility, versatile chemical design and possibility of low-cost production. Various organic devices like light-emitting diodes (OLEDs), photovoltaics (OPVs), field-effect transistors (OFETs), and memory are already on the way to commercial applications.

The performance and lifetime of these devices are dependent on both the properties of the materials as well as the interfaces between the organic layers and between organic and inorganic layers (Ma et al.,Adv. Funct. Mater., 2010, 20, 1371-1388). In particular the control of the characteristic of the metal/organic injection contact is essential for reaching a high performance in these devices.

To optimize the injection contact, we synthesised a novel class of molecules that are based on a commercial hole transport material (HTL) and are able to assemble from solution onto metal electrodes. We characterized Au-electrodes modified with these self-assembled monolayers (SAMs) by UPS/XPS, and studied the perfomance of bottom electrode OFETs with pentacene as the active layer.

With this new SAM we achieve an enhanced OFET performance in terms of a low contact resistance, increased mobility and on/off ratio compared to conventional SAMs such as Perfluorodecanethiol (PFDT) (Boudinet et al., Organic Electronics, 2010, 11, 227-237) and Pentafluorobenzenethiol (PFBT).