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1. A π-electron conjugated block copolymer, comprising:
a polymer block (A) and a polymer block (B), wherein the polymer block (A) comprises a monomer unit of -a-b-, the -a- has any one of groups represented by formulae (1)-(6), and the -b- is a monomer unit of any one of groups represented by formulae (7)-(17), wherein V1 is a nitrogen (—NR1—), oxygen (—O—) or sulfur (—S—); V2 is a carbon (—CR12—), nitrogen (—NR1—), silicon (—SiR12—) or germanium (—GeR12—); V3 is aryl or heteroaryl group represented by -(Ar)n-; V4 is a nitrogen (—NR1—), oxygen (—O—) or —CR2═CR2—; V5 is an oxygen (O) or sulfur (S); R1 is an alkyl group having 1-18 carbon atoms which is optionally each independently substituted; R2 is a hydrogen atom or an alkyl group having 1-18 carbon atoms which is optionally each independently substituted; R3 is an alkyl or alkoxy group having 1-18 carbon atoms which is optionally each independently substituted; R4 is a hydrogen atom, a halogen atom, an aryl group or an alkyl group having 1-18 carbon atoms which is optionally each independently substituted; R5 is an aryl group, an alkylcarbonyl group, an alkyloxycarbonyl group or an alkyl group having 1-18 carbon atoms which is optionally substituted, and R6 is a hydrogen atom or a halogen atom; and n represents an integer of 0-3, and wherein the polymer block (B) comprises a monomer unit of: a thiophene-2,5-diyl group having a substituent at least at a 3-position thereof; a bithiophene having one of thiophene-2,5-diyl groups having a substituent at least at a 3-position thereof; or a terthiophene having one of thiophene-2,5-diyl groups having a substituent at least at a 3-position thereof.
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