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Solar concentration without mirrors

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Mirror-free thermophotovoltaic devices could someday make a much simpler and less expensive system to concentrate sunlight. The goal is to prevent heat from escaping the thermoelectric material by using a photonic crystal – essentially, an array of precisely spaced microscopic holes in a top layer of the material. By concentrating the sunlight thermally – capturing it and reflecting it back into the material – the device could absorb as much heat as a standard black object, yet not reradiate much of the heat, suggests Peter Bermel, a scientist at MIT’s Research...Read full article

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