| http://www.w3.org/ns/prov#value | - However, such a polymer or other matrix component is not required, and the photoactive layer is optionally substantially free of any conductive and/or non-conductive polymer. [0028] While the orientation of the first set of embodiments is not required in this second set of embodiments, the noted orientation is, optionally, a feature of the second set of embodiments as well.
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