Small Fujitsu Device Harvests Both Solar and Thermal Energy 36
destinyland writes "Fujitsu has built a device that can simultaneously harvest energy from either light or heat. They've reduced production costs by using the same cheap organic substrate for both conversion processes, while also doubling the potential amount of energy that can be collected. 'Previously, dual harvesting of energy could only be done by combining two different devices,' the article notes — and the device's solar converter can even draw energy from indoor lighting as well as direct sunlight. Fujitsu predicts the device will be especially useful for powering medical sensors, since the flexible substrate can be included in monitors which conform to the shape of the human body."
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makes sense (Score:3)
From the article it seems they're using both the seebeck effect [wikipedia.org] and photovoltaic cells to do this with two different semiconductor materials. Basically it's a type of solid state solar thermal power generation.
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"Most solar panels decreases in efficiency warmer they are"
Most solar panels are still Si based. Some thin-film chemistries actually increase in efficiency when they get hotter, however.
Stanford's looking at something roughly similar [bizjournals.com].
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Actually I think they are using the same semiconductor for both Seebeck and photovoltaic power conversion, as the Fujitsu press release [fujitsu.com] seems to indicate. TFA is a nonsense clearly written by someone who read the press release without having even any clue of what is a semiconductor and therefore got it all wrong. I mean, did they even look at the schematic they copied? I wonder how this ended up linked here on /. instead of the original press release...
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The Seebeck effect is pretty inefficient, but it does produce electricity from heat which is better than no electricity. If the PV is maxxed but still hot, maybe the extra costs of the material justify the little extra bit of electricity it can add with the Seeback effect. Until we see actual efficiency measurements of an actual device, this announced device could be a waste of time. It always bothers me when a report doesn't mention the efficiency of the power generation or conversion, because it's never h
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Huh? (Score:1)
. . . simultaneously harvest energy from either light or heat
So which is it? Both or either?
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Heat is light, so take your choice.
Re:Huh? (Score:4, Informative)
Radiant heat is light, infrared. The heat in materials that is transferred conductively, like when you touch it or when a house warms surrounding outside air, is not light.
Sounds like a plot to a horror movie (Score:3, Funny)
"It's escaped from the lab, and is now harvesting the energy of the nearby town including its residents. If it continues at its current rate, we're looking at a worldwide extinction event in a matter of days."
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You see, this is why I always buy Sony.
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...because you expect it to fail instead of being able to continue at its current rate?
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Try a self-winding watch.
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You'll note the series wiring is taking off two opposite sides P-type segments, whereas the parallel wiring is connected to both N and P type.
The parallel diagram is deficient in that it should really show the parallel wiring between P-type segments the same way the serial diagram does, even though position on the section doesn't matter as much in the light harvesting. It would be clearer that they are the very same wire.
It looks like the best place to think of as the "ground" (too tired to deal with pluss
Bad summary (Score:3)
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Then why the quote "If either the ambient light or heat is not sufficient to power the sensor, this technology can supply power with both sources, by augmenting one source with the other." ?
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In this house we obey the second law of thermodynamics!
I still think my idea is better (Score:2)
Cover wind turbine tower bases with solar panels, and maybe find a way to coat the turbine blades with a photovoltaic material as well.
Plenty of wind and sun in the desert.
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Coat everything that's attached to the grid with PV material, especially things that already have an inverter. Reusing existing infrastructure can cut starting costs by half or more, which makes PV usually cheaper than the other grid generators. Every little bit counts, and the more distributed the solar receivers the more likely somewhere is getting sunlight at any given time. PV on as many roofs as possible not only increases generation, but distributes it around the grid, reducing substantial transmissio
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Go look at Nanosolar.
How do you mechanically stress spray-on photovoltaics?
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Actually if it were attached to a system that could determine which source was better at the time, then switch I think just putting a strip of this down the emergency lanes/inside lanes of all the major roadways in the US would probably provide some insane power. During the day gather sunlight and then in the hours and hours after that the roads maintain heat, gather ambient heat then.
If you could actually "pave" the roads with a photovoltaic material THEN you're talking serious energy. Major Highways see