AC/DC for More Solar Energy - Video

Monday 11th November 2013

Apply AC/DC to your solar panel and get more energy - that is what scientists have discovered.

In our last post on Friday we highlighted new research into new sources of energy - the post then revealed the harvesting of energy from microwaves and similar - amazingly we follow this up with work from Queen Mary University London, and Imperial College London, who recommend turning up your sound system to improve solar energy harvesting!

The high frequencies and pitch found in pop and rock music cause vibrations that enhanced energy generation in solar cells containing a cluster of ‘nanorods’, leading to a 40 percent increase in efficiency of the solar cells.

The study has implications for improving energy generation from sunlight, particularly for the development of new, lower cost, printed solar cells.

The researchers grew billions of tiny rods (nanorods) made from zinc oxide, then covered them with an active polymer to form a device that converts sunlight into electricity.

Using the special properties of the zinc oxide material, the team was able to show that sound levels as low as 75 decibels (equivalent to a typical roadside noise or a printer in an office) could significantly improve the solar cell performance.

Dr Steve Dunn, Reader in Nanoscale Materials from Queen Mary’s School of Engineering and Materials Science and co-author of the paper, stated on the Uni’s website: “After investigating systems for converting vibrations into electricity this is a really exciting development that shows a similar set of physical properties can also enhance the performance of a photovoltaic.”

Scientists had previously shown that applying pressure or strain to zinc oxide materials could result in voltage outputs, known as the piezoelectric effect. However, the effect of these piezoelectric voltages on solar cell efficiency had not received significant attention before.

"We thought the soundwaves, which produce random fluctuations, would cancel each other out and so didn't expect to see any significant overall effect on the power output," said James Durrant, Professor of Photochemistry at Imperial College London, who co-led the study.

"We tried playing music instead of dull flat sounds, as this helped us explore the effect of different pitches. The biggest difference we found was when we played pop music rather than classical, which we now realise is because our acoustic solar cells respond best to the higher pitched sounds present in pop music," he concluded.

The discovery could be used to power devices that are exposed to acoustic vibrations, such as air conditioning units or within cars and other vehicles.

Co-author Dr Joe Briscoe also from Queen Mary’s School of Engineering and Materials Science, commented: “The whole device is extremely simple and inexpensive to produce as the zinc oxide was grown using a simple, chemical solution technique and the polymer was also deposited from a solution.”

So get the big beats ready to generate more energy.

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Source Queen Mary University London

Categories: General, Renewable, Reviews, Technology

Monday 11th November 2013


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