Organic semiconductors get weird atedge

Organic semiconductors get weird at the edge

8:41 AM, 7th October 2015
Organic semiconductors get weird at the edge
Sarah Burke, Katherine Cochrane and Tanya Roussy in UBC’s Laboratory for Atomic Imaging Research.

VANCOUVER, CANADA: As the push for tinier and faster electronics continues, a new finding by University of British Columbia (UBC) scientists could help inform the design of the next generation of cheaper, more efficient devices.

The work, published in Nature Communications, details how electronic properties at the edges of organic molecular systems differ from the rest of the material.

Organic materials like plastics are of great interest for use in solar panels, light emitting diodes and transistors. They’re low in cost, light, and take less energy to produce than silicon. Interfaces to where one type of material meets another and play a key role in the functionality of all these devices.

“We found that the polarization-induced energy level shifts from the edge of these materials to the interior are significant, and can't be neglected when designing components,” said UBC PhD researcher Katherine Cochrane, lead author of the paper. 

“While we were expecting some differences, we were surprised by the size of the effect and that it occurred on the scale of a single molecule,” said UBC researcher Sarah Burke, an expert on nanoscale electronic and optoelectronic materials and author on the paper.

The researchers looked at ‘nano-islands’ of clustered organic molecules. The molecules were deposited on a silver crystal coated with an ultra-thin layer of salt only two atoms deep. The salt is an insulator and prevents electrons in the organic molecules from interacting with those in the silver - the researchers wanted to isolate the interactions of the molecules.

Not only did the molecules at the edge of the nano-islands have very different properties than in the middle, the variation in properties depended on the position and orientation of other molecules nearby.

The researchers, part of UBC’s Quantum Matter Institute, used a simple, analytical model to explain the differences which can be extended to predict interface properties in much more complex systems, like those encountered in a real device.

“Herbert Kroemer said in his Nobel lecture that ‘The interface is the device’ and it’s equally true for organic materials,” said Burke. “The differences we’ve seen at the edges of molecular clusters highlights one effect that we’ll need to consider as we design new materials for these devices, but likely they are many more surprises waiting to be discovered.”

The experiment was performed at UBC’s laboratory for atomic imaging research, which features three specially designed ultra-quiet rooms that allow the instruments to sit in complete silence, totally still, to perform their delicate measurements. This allowed the researchers to take dense data sets with a tool called a scanning tunnelling microscope (STM) that showed them the energy levels in real-space on the scale of single atoms.

© University of British Columbia News

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