"Nano-solar: It's becoming increasingly clear that nanotechnology will be the battering ram that makes solar power ubiquitous, as there's a growing number of techniques for using nano-scale materials in ways that increase efficiency and reduce costs.
Boingboing's David Pescovitz, writing for Berkeley Lab Notes, details the nanocrystal photovoltaic breakthrough we discussed back in October of 2005. Materials Science grad student Ilan Gur and his team figured out how to make photovoltaic materials out of inorganic nanocrystals, combining the resilience of traditional silicon photovoltaics with the ease of production and low cost of solar power polymers. Their only real drawback: a lowly 3% conversion efficiency. But no worries:
"If you can make this technology practical, you could imagine that people would be able to make solar cells where they don't have the tremendous capital needed to build plants, like in developing nations," Gur says. [...] "If we can produce this for as cheap as we hope, the efficiency doesn't have to be so high because you could just install more of the material," Gur says. "There are certainly places where people would trade space for energy."
The flip side of the nano-solar revolution can be found in the work of Richard Schaller, Melissa Petruska and Victor Klimov at the Los Alamos National Laboratory. Late last month, they published an article in Applied Physics Letters detailing a method of using nanocrystal "quantum dots" to boost the efficiency of photovoltaics made out of less-expensive materials like zinc or polymers. The potential boost is dramatic:
Los Alamos National Laboratory researchers have shown that it is possible to produce two or more electrons from a single photon using many kinds of semiconductor materials, not just the more exotic lead selenium of initial carrier multiplication experiments. [...] Solar cells made with semiconductor nanocrystals could use carrier multiplication to boost solar efficiency to 60 percent, according to the researchers. Today's state-of-the-art solar cells are less than 40 percent efficient.
Now what we need is to see what happens when you combine these two techniques. Cheap, rugged nanocrystal photovoltaics with better-than-silicon conversion efficiency is pretty much the Holy Grail of solar power research -- and it might even be possible to achieve."
Please see this
article from WorldChanging for relevant links.