Back contact layer for photovoltaic cells
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United States Patent and Trademark Office
Abstract
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A photovoltaic cell structure is disclosed that includes a back contact layer that includes single wall carbon nanotube elements. The single wall carbon nanotube (SWNT) back contact is in electrical communication with an adjacent semiconductor layer and provides a buffer characteristic that impedes elemental metal migration from the back contact into the semiconductor active layers. In one embodiment, the SWNT back contact includes a semiconductor characteristic and a buffer characteristic. In another embodiment, the SWNT back contact further includes a metallic characteristic.
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Keywords
H01L31/0224, B82Y10/00, B82Y20/00, H01L31/02, H01L31/0216, H01L31/0725, H01L31/073, H01L31/075, H01L31/076, H01L31/077, H01L31/18