Thin-film crystalline silicon solar cells
نویسنده
چکیده
A photoelectric conversion efficiency of over 10% has been achieved in thin-film polycrystalline silicon solar cells which consists of a 2 μm thick layer of polycrystalline silicon with a very small grain size (microcrystalline silicon) formed by low-temperature plasma CVD. This has shown that if the recombination velocity at grain boundaries can be made very small, then it is not necessarily important to increase the size of the crystal grains, and that an adequate current can be extracted even from a thin film due to the light trapping effect of silicon with a low absorption coefficient. As a result, this technology may eventually lead to the development of lowcost solar cells. Also, an initial efficiency as high as 12% has been achieved with a tandem solar cell module of microcrystalline silicon and amorphous silicon, which has now started to be produced commercially. An even greater initial efficiency of 14.5% has been achieved in devices with a small size area, and further increases of efficiency can be expected.
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