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Thin film solar cells (TFSC) generate electricity from sunshine or bright indoor lighting. The first TFSCs were introduced in the 1990s to power hand held calculators. TFSCs are made by attaching extremely thin photovoltaic (PV) materials such as amorphous silicon. The thickness of the PV materials is measured in nanometer or micrometers. These materials are applied to a base such as glass, metal or plastic. Before the PV materials are attached, the base surface is treated with a layer of transparent conducting oxide.

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