Bottom-Up Fabricated Asymmetric Electrodes for Organic Electronics
Andrea Liscio, Emanuele Orgiu, Jeffrey M. Mativetsky, Vincenzo Palermo, Paolo Samorì, Weinheim (2010)
Asymmetric electrodes, i.e. electrode pairs in which each electrode has a different workfunction (WF), play a major role in organic electronic applications where an energetic misalignment between the electrodes is beneficial for optimizing charge injection and extraction, e.g., in ambipolar field-effect transistors (FETs), planar light-emitting diodes and solar cells. The fabrication of coplanar asymmetric electrodes is usually obtained through the deposition of two different metals using two lithographic steps or by complex micrometric mask manipulations which are cumbersome, expensive and time consuming. Here we describe a method for obtaining asymmetric (nano)electrodes through the adsorption and electrochemical desorption of self-assembled monolayers on gold. The selective modification of electrode WF is demonstrated by Kelvin Probe Force Microscopy and electrical characterization of organic FETs. The proposed method is simple and fast, and could allow parallel, large-scale fabrication of asymmetric electrodes for both micro- and large area electronics.
Partners : UdS
Place of Publication : Weinheim
Date of Publication : 2010/08/31