| http://www.w3.org/ns/prov#value | - Examples of the photo-semiconductor material to be used include, but is not limited to, strontium titanate as well as metal oxides such as titanium oxide, zinc oxide, tin oxide, iron oxide, zirconium oxide, tungsten oxide, chromium oxide, molybdenum oxide, ruthenium oxide, germanium oxide, lead oxide, cadmium oxide, copper oxide, vanadium oxide, niobium oxide, tantalum oxide, manganese oxide, coba
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