Researchers overcome kinks in solar energy storage

October 17th, 2008 - 1:24 pm ICT by IANS  

Washington, Oct 17 (IANS) Researchers have created a new material that overcomes two of the major obstacles to storing solar energy: it absorbs all the energy in sunlight, generating electrons in a way that makes them easier to capture. Ohio State University chemists and their colleagues combined electrically conductive plastic with metals including molybdenum and titanium to create the hybrid material.

“There are other such hybrids out there, but the advantage of our material is that we can cover the entire range of the solar spectrum,” explained Malcolm Chisholm, chemistry professor at Ohio State University.

What our eyes interpret as colour are really different energy bands or frequencies of light. Today’s solar cell materials can only capture a small range of frequencies, so they can only capture a small fraction of the energy contained in sunlight, according to a release of Ohio State.

This new material is the first that can absorb all the energy contained in visible light at once. The material generates electricity just like other solar cell materials do: light energises the atoms of the material, and some of the electrons in those atoms are knocked loose.

Ideally, the electrons flow out of the device as electrical current, but this is where most solar cells run into trouble. The electrons only stay loose for a tiny fraction of a second before they sink back into the atoms from which they came. The electrons must be captured during the short time they are free, and this task, called charge separation, is difficult.

In the new hybrid material, electrons remain free much longer than ever before. To design the hybrid material, the chemists explored different molecular configurations on a computer at the Ohio Supercomputer Centre.

Then, with colleagues at National Taiwan University, they synthesised molecules of the new material in a liquid solution, measured the frequencies of light the molecules absorbed, and also measured the length of time that excited electrons remained free in the molecules.

They saw something very unusual. The molecules didn’t just fluoresce as some solar cell materials do. They phosphoresced as well. Both luminous effects are caused by a material absorbing and emitting energy, but phosphorescence lasts much longer.

To their surprise, the chemists found that the new material was emitting electrons in two different energy states — one called a singlet state, and the other a triplet state. Both energy states are useful for solar cell applications, and the triplet state lasts much longer than the singlet state.

Electrons in the singlet state stayed free for up to 12 picoseconds, or trillionths of a second — not unusual compared to some solar cell materials. But electrons in the triplet state stayed free 7 million times longer — up to 83 microseconds, or millionths of a second.

When they deposited the molecules in a thin film, similar to how they might be arranged in an actual solar cell, the triplet states lasted even longer: 200 microseconds.

At this point, the material is years from commercial development, but he added that this experiment provides a proof of concept — that hybrid solar cell materials such as this one can offer unusual properties.

The project was funded by the National Science Foundation and Ohio State’s Institute for Materials Research.

Chisholm is working with Arthur J. Epstein, professor of chemistry and physics; Paul Berger, professor of electrical and computer engineering and physics; and Nitin Padture, professor of materials science and engineering to develop the material further.

The study appeared in the current issue of the Proceedings of the National Academy of Sciences (PNAS).

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