Method and device for cadmium-free solar cells
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United States of America Patent
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Jan 14, 2014
Grant Date -
Sep 27, 2012
app pub date -
Sep 19, 2011
filing date -
Oct 1, 2010
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Abstract
A method for fabricating a thin film photovoltaic device is provided. The method includes providing a substrate comprising a thin film photovoltaic absorber which has a surface including copper, indium, gallium, selenium, and sulfur. The method further includes subjecting the surface to a material containing at least a zinc species substantially free of any cadmium. The surface is heated to cause formation of a zinc doped material. The zinc doped material is free from cadmium. Furthermore the method includes forming a zinc oxide material overlying the zinc doped material and forming a transparent conductive material overlying the zinc oxide material.
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