• Researchers Use Carbon Nanotubes to Make Solar Cells Affordable, Flexible
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[RELEASE] Researchers from Northwestern University have developed a carbon-based material that could revolutionize the way solar power is harvested. The new solar cell material – a transparent conductor made of carbon nanotubes – provides an alternative to current technology, which is mechanically brittle and reliant on a relatively rare mineral. Advanced Energy Materials - Electronically Monodisperse Single-Walled Carbon Nanotube Thin Films as Transparent Conducting Anodes in Organic Photovoltaic Devices [QUOTE]Single-walled carbon nanotubes (SWNTs) sorted by electronic type are employed as organic photovoltaic device anodes. Metal-enriched SWNT films yield device efficiencies that are fifty times greater than their semiconducting counterparts. Through sheet resistance, UV-vis-NIR optical absorbance, and X-ray photoelectron spectroscopy measurements, the OPV charge blocking layer PEDOT:PSS is found to reverse the original chemical doping of the SWNT films. The relative insensitivity of metallic SWNTs to chemical doping thus explains the improved performance of metal-enriched SWNT films as OPV anodes. [/QUOTE] [IMG]http://3.bp.blogspot.com/-m1MxRRzwqns/ToJojM7gmOI/AAAAAAAAMo4/LP85_jduB-o/s1600/cntflexsolar.jpg[/IMG] [QUOTE]Solar cells are comprised of several layers, including a transparent conductor layer that allows light to pass into the cell and electricity to pass out; for both of these actions to occur, the conductor must be both electrically conductive and also optically transparent. Few materials concurrently possess both of these properties. Currently, indium tin oxide is the dominant material used in transparent conductor applications, but the material has two potential limitations. Indium tin oxide is mechanically brittle, which precludes its use in applications that require mechanical flexibility. In addition, indium tin oxide relies on the relatively rare element indium, so the projected increased demand for solar cells could push the price of indium to problematically high levels. “If solar technology really becomes widespread, as everyone hopes it will, we will likely have a crisis in the supply of indium,” Hersam said. “There’s a great desire to identify materials – especially earth-abundant elements like carbon – that can take indium’s place in solar technology.” Hersam and Marks’ team has created an alternative to indium tin oxide using single-walled carbon nanotubes, tiny, hollow cylinders of carbon just one nanometer in diameter. The researchers have gone further to determine the type of nanotube that is most effective in transparent conductors. Nanotubes’ properties vary depending on their diameter and their chiral angle, the angle that describes the arrangement of carbon atoms along the length of the nanotube. These properties determine two types of nanotubes: metallic and semiconducting. Metallic nanotubes, the researchers found, are 50 times more effective than semiconducting ones when used as transparent conductors in organic solar cells. “We have now identified precisely the type of carbon nanotube that should be used in this application,” Hersam said. Because carbon nanotubes are flexible, as opposed to the brittle indium tin oxide, the researchers’ findings could pave the way for many new applications in solar cells. For example, the military could incorporate the flexible solar cells into tent material to provide solar power directly to soldiers in the field, or the cells could be integrated into clothing, backpacks, or purses for wearable electronics. “With this mechanically flexible technology, it’s much easier to imagine integrating solar technology into everyday life, rather than carrying around a large, inflexible solar cell,” Hersam said. Researchers are now examining other layers of the solar cell to explore also replacing these with carbon-based nanomaterials.[/QUOTE][/RELEASE] Source: [url]http://nextbigfuture.com/2011/09/researchers-use-carbon-nanotubes-to.html[/url]
Finally we'll be able to afford Solar... Shit's expensive.
Maybe the realization that we can't produce arbitrarily long nanotubes without errors will make them pursue molecular manufacturing. Unless some fucker ruins everything by inventing an ordinary chemistry way to create long, continuous, single nanotubes.
Neat! Also, Bendy!
I wonder how expensive it'd be to get your roof solar-celled, seems like it'd pay off in the long run
[QUOTE=General J;32522900]I wonder how expensive it'd be to get your roof solar-celled, seems like it'd pay off in the long run[/QUOTE] There are several goverment funded schemes in the UK where you get free solar cells for your roof. You basically power your house and pay back the investment or pay for them up front to be fitted power your house and sell the extra onto the grid. Cheaper cells means more people would take this up. (I was quoted 14k for my roof btw)
Hell yes, any progress in nanotube production is good news.
About time they actually used carbon nanotubes for something. I remember they were discussing making a space elevator using buckytubes <.<
Carbon nanotubes are really awesome. Let's just hope that find a cheap way to produce them, so we can all benefit from their uses.
Flexible? Nice! Reminds me of OLED screens, and those already seem to have a bunch of cool uses.
you know if we had got our heads out of our jesus-kissed asses and stopped being sheeps to the church say, 500 years ago, we could have been in another galaxy by now.
[QUOTE=MightyMax;32529093]you know if we had got our heads out of our jesus-kissed asses and stopped being sheeps to the church say, 500 years ago, we could have been in another galaxy by now.[/QUOTE] not another galaxy, perhaps off of this planet though
[QUOTE=MightyMax;32529093]you know if we had got our heads out of our jesus-kissed asses and stopped being sheeps to the church say, 500 years ago, we could have been in another galaxy by now.[/QUOTE] Who knows where we'd be if those gosh-darn barbarian hordes hadn't sacked Rome and caused the Dark Age?
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