Leaf-like solar cells: Water-based 'artificial leaf' produces electricity

(PhysOrg.com) -- A team led by a North Carolina State University researcher has shown that water-gel-based solar devices - "artificial leaves" - can act like solar cells to produce electricity. The findings prove the concept for making solar cells that more closely mimic nature. They also have the potential to be less expensive and more environmentally friendly than the current standard-bearer: silicon-based solar cells.

The bendable devices are composed of water-based gel infused with light-sensitive - the researchers used plant chlorophyll in one of the experiments - coupled with electrodes coated by carbon materials, such as carbon nanotubes or graphite.

The light-sensitive molecules get "excited" by the sun's rays to produce electricity, similar to plant molecules that get excited to synthesize sugars in order to grow, says NC State's Dr. Orlin Velev, Invista Professor of Chemical and Biomolecular Engineering and the lead author of a paper published online in the describing this new generation of solar cells.

Velev says that the research team hopes to "learn how to mimic the materials by which nature harnesses solar energy." Although synthetic light-sensitive molecules can be used, Velev says naturally derived products - like - are also easily integrated in these devices because of their water-gel matrix.

Now that they've proven the concept, Velev says the researchers will work to fine-tune the water-based photovoltaic devices, making them even more like real leaves.

"The next step is to mimic the self-regenerating mechanisms found in plants," Velev says. "The other challenge is to change the water-based gel and light-sensitive molecules to improve the efficiency of the solar cells."

Velev even imagines a future where roofs could be covered with soft sheets of similar electricity-generating artificial-leaf .

"We do not want to overpromise at this stage, as the devices are still of relatively low efficiency and there is a long way to go before this can become a practical technology," Velev says. "However, we believe that the concept of biologically inspired 'soft' devices for generating electricity may in the future provide an alternative for the present-day solid-state technologies."


Explore further

Substantial improvement in essential cheap solar cell process

More information: Hyung-Jun Koo and Dr. Orlin D. Velev, "Aqueous soft matter based photovoltaic devices" Published: Online Sept. 21, 2010, in Journal of Materials Chemistry
Citation: Leaf-like solar cells: Water-based 'artificial leaf' produces electricity (2010, September 24) retrieved 19 August 2019 from https://phys.org/news/2010-09-leaf-like-solar-cells-water-based-artificial.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
0 shares

Feedback to editors

User comments

Sep 24, 2010
Any data how many hours the cell keeps on working. I thought the lifespan of sun radiated chlorophyll is quite limited.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more