We certainly hear a lot about solar cells that are able to convert larger and larger percentages of the sun’s energy into electricity. That’s all very well and good, but if those more-efficient solar cells are too expensive, they will still ultimately prove impractical for everyday use. Researchers from North Carolina State University, however, have found a way of creating “ultra-thin” solar cells that should create just as much electricity as their thicker siblings, but at a lower cost.
The new cells are made using what is called a “nanoscale sandwich” design. The process starts with a pattern being laid down on a transparent dielectric substrate, using regular lithography techniques. That pattern forms the substrate into tiny structures measuring between 200 and 300 nanometers in height – when viewed in cross-section, they resemble the crenelations along the top of a medieval castle.
Next, a very thin layer of the active material is deposited onto the altered substrate. This “active layer” is what actually converts the solar energy into electricity. Finally, on top of that layer, another layer of the dielectric material is deposited. This results in a dielectric/active material/dielectric sandwich.
The crenelated shape of this sandwich allows the two dielectric layers to serve as highly-efficient optical antennas, focusing the solar energy onto the layer of active material – this means that less of that material can be used, without a loss in performance.
“We created a solar cell with an active layer of amorphous silicon that is only 70 nanometers (nm) thick,” said Dr. Linyou Cao, co-author of a paper on the research. “This is a significant improvement, because typical thin-film solar cells currently on the market that also use amorphous silicon have active layers between 300 and 500 nm thick.”
He added that the same technique could be used to create solar cells incorporating other active materials, such as cadmium telluride, copper indium gallium selenide, and organic materials.
His paper was recently published in the journal Nano Letters.
Source: North Carolina State University
Fact is shopped righ,t PV is cheaper than retail nuke, coal, NG is in most places.
sunelec.com is just one source.
What solar/RE, the world needs is the full costs of nuke, coal and oil put in their price instead of in our taxes, health, oil wars, etc costs and cutting out laws, regs that give FFuels a monopoly like here in Fla.
As per most short-sighted businesses, they were wanting to maximise rate of return. I pointed out that if they took advanced orders for their cells at a substantially cheaper retail cost than the dominant players whilst the manufacturing facility was being built, they'd block out the incumbent competition and launch a whole new customer base at the same time.
'Too difficult' was the essence of the reply
So whilst this idea (and others like it) have the 'potential' to deliver a more cost effective panel, the sad reality is that short termism of ROI will see it priced the same or higher than existing PVs