| http://www.w3.org/ns/prov#value | - The electron transport layer is constituted of an electron conducting polymer represented by the formula (I) ##STR1## wherein R1 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, R2 is a hydrogen atom, an alkyl or alkoxy group having 1 to 4 carbon atoms, an aryl group, an aryloxy group, a thioether group, an amino group, a halogen atom, an aldehyde group, a cyano group, a nitro grou
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