Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International



Home > Press > Organic electronics -- how to make contact between carbon compounds and metal

Upon contact between the oxygen atoms protruding from the backbone and the metal, the molecules' internal structure changed in such a way that they lost their semiconducting properties and instead adopted the metallic properties of the surface.

Credit: Visualisation: Georg Heimel/HU Berlin
Upon contact between the oxygen atoms protruding from the backbone and the metal, the molecules' internal structure changed in such a way that they lost their semiconducting properties and instead adopted the metallic properties of the surface.

Credit: Visualisation: Georg Heimel/HU Berlin

Abstract:
Until now, however, it was practically impossible to accurately predict which molecules performed well on the job. They basically had to be identified by trial-and-error.

Now, an international team of scientists around Dr. Georg Heimel and Prof. Norbert Koch from the HZB and the Humboldt University Berlin has unraveled the mystery of what these molecules have in common. Their discovery enables more focused improvements to contact layers between metal electrodes and active materials in organic electronic devices.

Organic electronics -- how to make contact between carbon compounds and metal

Berlin, Germany | Posted on February 18th, 2013

"We have been working on this question for a number of years now and could at last come up with a conclusive picture using a combination of several experimental methods and theoretical calculations," Georg Heimel explains. The researchers systematically examined different types of molecules whose backbones consist of the same chain of fused aromatic carbon rings. They differed in just one little detail: the number of oxygen atoms projecting from the backbone. These modified molecules were placed on the typical contact metals gold, silver, and copper.

Using photoelectron spectroscopy (UPS and XPS) at HZB's own BESSY II synchrotron radiation source, the researchers were able to identify chemical bonds that formed between the metal surfaces and the molecules as well as to measure the energy levels of the conduction electrons. Colleagues from Germany's Tübingen University determined the exact distance between the molecules and the metal surfaces using x-ray standing wave measurements taken at the ESRF synchrotron radiation source in Grenoble, France.

These experiments showed that, upon contact between the oxygen atoms protruding from the backbone and several of the metals, the molecules' internal structure changed in such a way that they lost their semiconducting properties and instead adopted the metallic properties of the surface. Despite similar prerequisites, this effect was not observed for the "bare"-backbone molecule. From the observation which molecules underwent these kinds of drastic changes on what metal, the researchers could derive general guidelines. "At this point, we have a pretty good sense of how molecules ought to look like and what their properties should be if they are to be good mediators between active organic materials and metal contacts, or, as we like to call it, good at forming soft metallic contacts," says Heimel.

Experts from a number of other German universities and from research facilities in Suzhou (China), Iwate and Chiba (Japan), and ESRF (France) have also contributed substantially to this publication.

####

For more information, please click here

Contacts:
Dr. Georg Heimel


Prof. Dr. Norbert Koch
Fon: +49 30-20 93 78 19

Copyright © Helmholtz Association of German Research Centres

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Lehigh University to lead ‘integrative partnerships’ for multi-university research collaboration in advanced optoelectronic material development: 5-year, $25 million NSF investment in IMOD, a revolutionary center for optoelectronic, quantum technologies September 10th, 2021

Engineering various sources of loss provides new features for perfect light absorption: "Loss is ubiquitous in nature, and by better understanding it, we make it more useful" September 10th, 2021

New substance classes for nanomaterials: Nano spheres and diamond slivers made of silicon and germanium: Potential applications as nano semiconductor materials September 10th, 2021

‘Anti-rust’ coating for plants protects against disease with cellulose nanofiber: Researchers from the University of Tsukuba find that coating soybean plant leaves with cellulose nanofiber offers resistance to infection by Asian soybean rust pathogen September 10th, 2021

Leibniz Prize winner Professor Dr. Oliver G. Schmidt moves to Chemnitz University of Technology: President Professor Dr. Gerd Strohmeier refers to an 'absolute top transfer' September 10th, 2021

Display technology/LEDs/SS Lighting/OLEDs

New substance classes for nanomaterials: Nano spheres and diamond slivers made of silicon and germanium: Potential applications as nano semiconductor materials September 10th, 2021

Chip Technology

Engineering various sources of loss provides new features for perfect light absorption: "Loss is ubiquitous in nature, and by better understanding it, we make it more useful" September 10th, 2021

Leibniz Prize winner Professor Dr. Oliver G. Schmidt moves to Chemnitz University of Technology: President Professor Dr. Gerd Strohmeier refers to an 'absolute top transfer' September 10th, 2021

Ultrafast & ultrathin: new physics professor at TU Dresden makes mysterious quantum world visible September 10th, 2021

Tapping into magnets to clamp down on noise in quantum information September 9th, 2021

Discoveries

Cheaper hydrogen production: Efficient water and urea electrolysis with bimetallic yolk-shell nanoparticles September 10th, 2021

Lehigh University to lead ‘integrative partnerships’ for multi-university research collaboration in advanced optoelectronic material development: 5-year, $25 million NSF investment in IMOD, a revolutionary center for optoelectronic, quantum technologies September 10th, 2021

New substance classes for nanomaterials: Nano spheres and diamond slivers made of silicon and germanium: Potential applications as nano semiconductor materials September 10th, 2021

‘Anti-rust’ coating for plants protects against disease with cellulose nanofiber: Researchers from the University of Tsukuba find that coating soybean plant leaves with cellulose nanofiber offers resistance to infection by Asian soybean rust pathogen September 10th, 2021

Announcements

‘Anti-rust’ coating for plants protects against disease with cellulose nanofiber: Researchers from the University of Tsukuba find that coating soybean plant leaves with cellulose nanofiber offers resistance to infection by Asian soybean rust pathogen September 10th, 2021

Leibniz Prize winner Professor Dr. Oliver G. Schmidt moves to Chemnitz University of Technology: President Professor Dr. Gerd Strohmeier refers to an 'absolute top transfer' September 10th, 2021

Ultrafast & ultrathin: new physics professor at TU Dresden makes mysterious quantum world visible September 10th, 2021

Stretching the capacity of flexible energy storage September 10th, 2021

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project