| http://www.w3.org/ns/prov#value | - It is also desirable for the counter substrate to be formed of a tin oxide film or a zinc oxide film. [0122] 5) Conductive film: [0123] The conductive film can be formed of a metal such as platinum, gold or silver. [0124] Each of the first and second solar cells of the present invention can be prepared by, for example, the method described in the following. [0125] In the first step, prepared is a
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