Thermophotovoltaic devices or the photoelectric conversion rate limits

Polaris solar PV net news: according to the United States Massachusetts Institute of technology official website news, scientists have demonstrated for the first time at the school, using solar thermal photovoltaic devices (STPVs), the photoelectric conversion efficiency of solar cells is expected to exceed the theoretical limit.

Latest research principle is very simple: do not let solar panels cannot be used within the energy dissipated as heat, first of all energy and heat is an intermediate element absorption components can release heat radiation temperature is reached. By tuning add materials and structures, radiation released in light of the appropriate wavelength, the wavelength of light will be solar cells capture, thus improving the conversion efficiency of the system and reduce solar heat build up.

The key is used when heated to release the exact wavelength optical Nano-Photonic crystals. In the test, Nano-Photonic crystals are incorporated into a set with vertically-aligned carbon nanotubes systems, when the appliance is heated to 1000 degrees Celsius, Photonic Crystal will continue to release the wavelength band an exact match with the neighbor photovoltaic cells to capture light, photovoltaic cells to capture the light and turning it into electricity. Researchers are using a photovoltaic cells with STPVs components were tested, results and theoretical predictions matched.

People known in 1961, Shockley traditional photoelectric conversion efficiency of solar cells ˙ kuiyise efficiency limit. Currently widely used single-layer silicon solar cells for solar panels, conversion limit is 32%. But there are ways to improve the overall efficiency of the solar panels, such as the use of multiple batteries, or use a STPVs device, before you build the power to turn sunlight into heat. Published in the new issue of nature ˙ energy magazine, the latest research on what method should be used.

Study author David ˙ Bilman said theory forecast predicts that the traditional solar cells to work together with other high-tech materials, can make more than twice times the conversion efficiency at its theoretical limit. Compared with conventional photovoltaic devices, this new system has obvious advantages. First of all, Photonic devices based on the heat rather than light radiation, which means that it will not be affected by subtle changes in the environment affect and, secondly, it coupled a thermal storage system, ongoing use of solar energy. “Studies have shown that we can actually break Shockley ˙ kuiyise efficiency limit”. Next, they plan to manufacture larger versions of the solar cell, and find ways to reduce manufacturing costs.

In General, see in the solar thermal energy is not a happy thing–this is the energy that is wasted, and may interfere with normal operation of the battery. But in this latest material structure, the heat cannot escape, carbon nanotube thermal energy conversion back to the light. This increased to the side panel capacity in specific areas, reduce the effects of heat. This technology is still in the laboratory stage, batch production of complex carbon nanotubes will be difficult, so much for promising technologies, path is just a matter of practical application.

Original title: thermal solar devices or the photoelectric conversion rate limits

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