Biocompatible and Biodegradable Materials for Organic Field Effect Transistors and Circuits: Route towards Green Electronics
Sprache des Vortragstitels:
E-MRS 2011 Spring Meeting
Sprache des Tagungstitel:
Organic electronics has the potential to develop electronic products that are biocompatible, bioresorbable, biodegradable or even capable to bio-metabolize. An ideal solution for the production of such devices involves the fabrication of the electronics either from natural materials, or from materials that have been proved to be at least biocompatible. Here we report the combination of biocompatible and biodegradable substrates based on hard gelatine capsule, Shellac (wood finishing) or commercially available plastic foil based on starch, corn and polylactic acid (Ecoflex®, BASF) with fully natural or materials found in common commodity products, as gate dielectrics and organic semiconductors in low operating voltage organic field effect transistors (OFETs). In a first example, low operating voltage OFETs are built on commercially available biodegradable plastic foil (Ecoflex®, BASF), comprising naturally occurring dielectrics: adenine, guanine, cytosine, thymine and widely accepted perylene diimide-a simple red dye used extensively in cosmetic industry. In a second example, complete bio-materials based OFETs are introduced based on glucose, lactose, sucrose, for the gate dielectrics with vacuum processed indigo or solution processed beta-carotene as organic semiconductors respectively. In a third example, fully degradable devices are produced on hard gelatine capsule substrates comprising layers of adenine and guanine for organic dielectrics and indanthrene yellow G and indanthrene brilliant orange RF (two vat dyes used extensively in textile industry) for the organic semiconductor. Tremendous improvement of the OFETs characteristics are feasible simply by employing aurin, a naturally occurring red-orange pigment as a smoothening layer for Ecoflex and hard gelatine capsule substrates or by employing the anodization of the aluminium gate electrodes in combination with organic dielectric layers for the samples built on glass substrates.