Connect with us

Hi, what are you looking for?


Clean Power

Simple Way To Create Highly-Efficient Organic Solar Cells Discovered

A new and somewhat unexpected way to create very high-efficiency organic solar cells has been found. Rather than working solely to increase the purity of a solar cell’s two domains — acceptor and donor — researchers found that if impure domains are made smaller, this also increases efficiency levels.


Image Credits: Harald Ade, NC State University

“We’ve shown that impure domains if made sufficiently small can also lead to improved performances in polymer-based organic photovoltaic cells,” says Harald Ade, a physicist at North Carolina State University, who led this research. “There seems to be a happy medium, a sweet-spot of sorts, between purity and domain size that should be much easier to achieve than ultra-high purity.”

The conversion efficiency of polymer/organic photovoltaic cells is extremely dependent upon excitons, which are electron/hole pairs that are energized by light, making their way quickly to the interfaces of the donor and acceptor domains, and losing less energy in the form of heat. It was assumed that the primary way to increase the speed at which this occurs was by increasing the purity of the domains, leaving less to slow down the excitons. But the new research clearly shows that it can also be increased by making the domain size smaller.

This research is also the first time that the domain size, composition, and crystallinity of an organic solar cell has been measured all at once. It was this knowledge that allowed this breakthrough.

By using a solvent to shrink down the dominant acceptor domain size from 177 nanometers to 34 nanometers, the researchers were able to increase the efficiency of the material by a substantial amount, 42%.

Source: DOE/Lawrence Berkeley National Laboratory 

Appreciate CleanTechnica’s originality? Consider becoming a CleanTechnica Member, Supporter, Technician, or Ambassador — or a patron on Patreon.

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

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.


You May Also Like

Clean Power

18 years of hard work has resulted in the startup infinityPV finally commercializing products with printed solar photovoltaic foil.

Clean Power

A new "singlet fission" breakthrough in organic solar cell research suggests that the golfer-in-chief should spend less time on the links and more time...

Clean Power

The Germany-based organic solar PV company Heliatek will be providing solar films to be used in what will be, once completed, the largest building-integrated...

Clean Power

When I was at Abu Dhabi Ascent earlier this year, I got to speak with Dr. Steve Griffiths, Executive Director of Institute Initiatives at...

Copyright © 2021 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.