Spray-on Solar Power

Tuesday, December 9, 2014 @ 11:12 AM gHale

There is now a way to spray solar cells onto flexible surfaces using miniscule light-sensitive materials.

These materials, known as colloidal quantum dots (CQDs), are a major advance toward making spray-on solar cells easy and cheap to manufacture.

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“My dream is that one day you’ll have two technicians with Ghostbusters backpacks come to your house and spray your roof,” said Illan Kramer, a post-doctoral fellow with the Ted Sargent group in the Edward S. Rogers Sr. Department of Electrical & Computer Engineering at the University of Toronto, and IBM Canada’s Research and Development Centre.

Solar-sensitive CQDs printed onto a flexible film could coat all kinds of weirdly shaped surfaces, from patio furniture to an airplane’s wing. A surface the size of your car’s roof wrapped with CQD-coated film would produce enough energy to power three 100-Watt light bulbs—or 24 compact fluorescents.

He calls his system sprayLD, a play on the manufacturing process called ALD, short for atomic layer deposition, in which materials end up laid down on a surface one atom-thickness at a time.

Until now, it was only possible to incorporate light-sensitive CQDs onto surfaces through batch processing — an inefficient, slow and expensive assembly-line approach to chemical coating. SprayLD blasts a liquid containing CQDs directly onto flexible surfaces, such as film or plastic, like printing a newspaper by applying ink onto a roll of paper. This roll-to-roll coating method makes incorporating solar cells into existing manufacturing processes much simpler. Kramer said the sprayLD method can end up used on flexible materials without any major loss in solar-cell efficiency.

Kramer built his sprayLD device using parts readily available and affordable. He used a spray nozzle used in steel mills to cool steel with a fine mist of water, and a few regular air brushes from an art store.

“This is something you can build in a Junkyard Wars fashion, which is basically how we did it,” Kramer said. “We think of this as a no-compromise solution for shifting from batch processing to roll-to-roll.”

“As quantum dot solar technology advances rapidly in performance, it’s important to determine how to scale them and make this new class of solar technologies manufacturable,” said Sargent, vice dean, research in the Faculty of Applied Science & Engineering at University of Toronto. “We were thrilled when this attractively manufacturable spray-coating process also led to superior performance devices showing improved control and purity.”

In addition, Kramer and his colleagues used a Blue Gene/Q supercomputer owned by the Southern Ontario Smart Computing Innovation Platform (SOSCIP) to model how and why the sprayed CQDs perform just as well as — and in some cases better than — their batch-processed counterparts.

SOSCIP is an R&D consortium consisting of 11 southern Ontario universities and the IBM Canada Research and Development Centre.

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