Organic semiconductors get weird at the edges

A new finding by University of British Columbia scientists could lead to the next generation of cheaper, more efficient devices. 

In the journal Nature Communications, the researchers explain how electronic properties at the edges of organic molecular systems differ from the rest of the material.

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

“We found that the polarisation-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,” added 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 ultrathin 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 there are many more surprises waiting to be discovered.”

Cochrane and colleagues plan to keep looking at what happens at interfaces in these materials and to work with materials chemists to guide the design rules for the structure and electronic properties of future devices.