Connect with us

Hi, what are you looking for?

CleanTechnica

Clean Power

Significantly More Efficient Solar Cells Thanks To New Technique

Significant improvements to solar cell efficiency are now possible because of a new technique created by researchers at the University of Toronto.

solar cell efficiency boost

The new technique greatly improves the efficiency of colloidal quantum dot photovoltaics, which is a design that was already looking attractive as a path to cheap, very efficient solar cells. Previously, though, these quantum dot photovoltaics were not very efficient in the infrared portion of the solar spectrum. Infrared makes up about half of the Sun’s energy that reaches the Earth, so it’s important to harvest this, for maximum efficiency.

But now, the new technique is able to address this, through the creation of spectrally tuned, solution-processed plasmonic nanoparticles. These modified particles allow for a greatly increased degree of control over light’s “propagation and absorption.”

“The new technique developed by Ted Sargent’s group shows a possible 35 per cent increase in the technology’s efficiency in the near-infrared spectral region,” states co-author Dr. Susanna Thon. “Overall, this could translate to an 11 per cent solar power conversion efficiency increase, making quantum dot photovoltaics even more attractive as an alternative to current solar cell technologies.”

“There are two advantages to colloidal quantum dots,” Thon says. “First, they’re much cheaper, so they reduce the cost of electricity generation measured in cost per watt of power. But the main advantage is that by simply changing the size of the quantum dot, you can change its light-absorption spectrum. Changing the size is very easy, and this size-tunability is a property shared by plasmonic materials: by changing the size of the plasmonic particles, we were able to overlap the absorption and scattering spectra of these two key classes of nanomaterials.”

The technique is based around the use of gold nanoshells embedded directly into the quantum dot absorber film. Gold isn’t cheap, though, so the researchers are currently working to find cheaper metals to replace gold, something that they say shouldn’t be difficult.

The new research paper, titled “Jointly-tuned plasmonic-excitonic photovoltaics using nanoshells,” was just published in the journal Nano Letters.

Source: University of Toronto Faculty of Applied Science and Engineering
Image Credit: University of Toronto

 
 
 
Don't want to miss a cleantech story? Sign up for daily news updates from CleanTechnica on email. Or follow us on Google News!
 

Have a tip for CleanTechnica, want to advertise, or want to suggest a guest for our CleanTech Talk podcast? Contact us here.
Advertisement
 
Written By

James Ayre's background is predominantly in geopolitics and history, but he has an obsessive interest in pretty much everything. After an early life spent in the Imperial Free City of Dortmund, James followed the river Ruhr to Cofbuokheim, where he attended the University of Astnide. And where he also briefly considered entering the coal mining business. He currently writes for a living, on a broad variety of subjects, ranging from science, to politics, to military history, to renewable energy.

Comments

You May Also Like

Cars

Both Shell and bp are getting involved in EV charging networks as they look to transition from oil and production to the green economy.

Clean Transport

A recent post over at The Verge leaves us with some big questions about Shell’s latest product offerings. Normally, Shell offers oil. Lots of...

Clean Power

As the Russian Baltic Fleet rattles its sword, renewable energy stakeholders in Sweden and elsewhere are eyeballing Baltic Sea offshore wind for a foothold...

Clean Power

Just look at the size of this thing! New "TetraSpar" offshore floating wind demonstration project is good news for global steel industry.

Copyright © 2023 CleanTechnica. The content produced by this site is for entertainment purposes only. Opinions and comments published on this site may not be sanctioned by and do not necessarily represent the views of CleanTechnica, its owners, sponsors, affiliates, or subsidiaries.