Timeline for Alternative solar panels
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
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| May 16, 2014 at 13:52 | comment | added | Jim | That said, radio antennas are not very energy efficient. At least, not in the way of power generation. I think I read somewhere when I used to work on solar cells that below NIR, the energy one would acquire is just too low to be of significant use. | |
| May 16, 2014 at 0:05 | comment | added | DumpsterDoofus | Yeah, it's fairly similar. In an antenna, radio waves force electrons to sort of slosh back and forth in the metal rod, and the resonance frequency of this sloshing is in roughly the same region as the radio waves. Similarly, in molecules, visible light causes electron density to slosh back and forth in the molecule, and the sloshing resonant frequency is usually in the visible range. | |
| May 15, 2014 at 23:59 | comment | added | jpfx1342 | @DumpsterDoofus Yeah, I figured a large portion of the spectrum would suffer from that problem. (a lack of energy at that frequency.) The color comment is quite interesting! I had never thought of it that way, but that makes perfect sense. I knew that the color of an object had to do with the wavelengths the molecules of that object absorb, but I had never considered them to be "tiny antennas". Quite enlightening. | |
| May 15, 2014 at 23:45 | comment | added | DumpsterDoofus | Second, you bring up an interesting analogy: "Does this mean that the units of a normal solar cell are basically just tiny antennas for light?" The answer is yes, and in fact, the analogy can be extended to more than just solar cells. For example, the reason things such as carrots and tomatoes are colored orange and red is due to light being absorbed by tiny antennas which are embedded in the vegetable's flesh; these antennas are called molecules. In the case of a solar cell, it's more complicated (band gap of the material etc), but the idea is somewhat similar. | |
| May 15, 2014 at 23:44 | review | First posts | |||
| May 15, 2014 at 23:45 | |||||
| May 15, 2014 at 23:41 | comment | added | DumpsterDoofus | So a couple points are probably worth mentioning. First, while solar cells only use the visible portion, which is about 1/10th of the EM range depicted, that does not necessarily mean that you will gain 10 times as much power by making use of the unused parts of the spectrum, primarily because the majority of the energy emitted by the sun is concentrated in the visible region. So the only useful portion would be to find a way to use the infrared portion (the UV, X-ray, gamma ray portion has almost no energy). | |
| May 15, 2014 at 23:27 | history | asked | jpfx1342 | CC BY-SA 3.0 |
