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Zernike Institute for Advanced Materials Colloquium B. de Boer

Roster

WhenWhere
12 March 2007 FWN-Building 5111.0022, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. B. de Boer
Affiliation: Molecular Electronics, University of Groningen
Title: Conjugated polymers and self-assembled monolayers: a reliable alliance
Date: Mon Mar 12, 2007
Start: 15.00
Location: FWN-Building 5111.0022
Host: G. ten Brinke and A.J. Schouten
Telephone: +31 50 363 4509, 4513

Abstract

Incorporation of self-assembled monolayers (SAMs) in (semi-)conducting organic diodes is an attractive way to study fundamental processes in organic electronics. We have incorporated SAMs in organic diodes with the general structure metal/SAM/polymer/metal. Using the dipole of a SAM we can tune the injection barriers for holes and electrons into the semiconducting polymer through the formation of dipoles on the metal surface. Applying these modified electrodes, the hole current in a polymer LED can be tuned by more than 6 orders of magnitude. Suppression of the hole current enabled us to measure the electron current in pristine polymers and in polymer/polymer blend photovoltaic cells. Furthermore, we can modify the injection of charges in polymeric field-effect transistors. The field of molecular electronics is a relatively new field with many unexplored directions with respect to self-assembled monolayers. The major limitation is contacting the molecules reliably with the formation of short-circuits. We have tackled this problem by spin coating a conducting polymer onto the self-assembled monolayer, yielding very robust and reproducible metal-molecule-metal junctions. This technology using conventional photolithography allows for the fabrication of molecular devices in circuitry and will pave the way for molecular electronics.
Last modified:22 October 2012 2.30 p.m.