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| - Examples of suitable inorganic materials that may be used as the first charge-transfer material 107 include, e.g., metal oxides such as Titania (TiO2), zinc oxide (ZnO2), zirconium oxide, lanthanum oxide, niobium oxide, tin oxide, indium oxide, indium tin oxide (ITO), vanadium oxide, molybdenum oxide, strontium oxide, calcium/titanium oxide and other oxides, sodium titanate, potassium niobate, Cad
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