Conductive polymer composite and substrate

A conductive polymer composite comprising:

• (A) a π-conjugated polymer, and
• (B) a dopant polymer which contains a repeating unit “a” shown by the following general formula (1) and has a weight-average molecular weight in the range of 1,000 to 500,000,
• wherein R1 represent a hydrogen atom or a methyl group;
• R2 represents a single bond, an ester group, or a linear, branched, or cyclic hydrocarbon-containing organic group having 1 to 12 carbon atoms and optionally containing either or both of an ether group and an ester group, other than that the ether group in R2 is directly bonded to the sulfur atom in the formula;
• R3 represents a linear or branched alkyl group having 1 to 4 carbon atoms in which one or more hydrogen atoms in R3 are substituted with a fluorine atom;
• Z represents a single bond, a phenylene group, a naphthylene group, an ether group, or an ester group, with the proviso that when R2 represents a single bond or an ester group, Z is not an ether group;
• “a” is a number satisfying 0<a≤1.0.