| http://www.w3.org/ns/prov#value | - The film thickness of the anode is not particularly limited, but it is preferably between 10 and 1,000 nm and more suitably between 10 and 200 nm. (ii) Cathode On the other hand, for the cathode, it is preferable to use metal, alloy, electrically conductive compound or these mixtures with a small work function (for example, less than 4.0 eV).
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