Conjugated polymer comprising a derivative of indacen-4-one having general formula (I): wherein: - R 1 and R 2 , the same as or different from each other, preferably the same as each other, are selected from C 1 -C 30 , preferably C 2 -C 20 , alkyl groups, linear or branched; optionally substituted cycloalkyl groups; optionally substituted aryl groups; optionally substituted heteroaryl groups; C 1 -C 30 , preferably C 2 -C 20 , alkoxyl groups, linear or branched; R 4 -O-CH 2 -CH 2 -O] n - polyoxyethylene groups, wherein R 4 is selected from C 1 -C 30 , preferably C 2 -C 20 , alkyl groups, linear or branched, and n is an integer ranging from 1 to 4; -R 5 -OR 6 groups, wherein R 5 is selected from C 1 -C 30 , preferably C 2 -C 20 , alkylene groups, linear or branched, and R 6 represents a hydrogen atom or is selected from C 1 -C 30 , preferably C 2 -C 20 , alkyl groups, linear or branched, or is selected from R 4 -[-OCH 2 -CH 2 -] p - polyoxyethylene groups, wherein R 4 has the same meanings as reported above and p is an integer ranging from 1 to 4; -COR 7 groups, wherein R 7 is selected from C 1 -C 30 , preferably C 2 -C 20 , alkyl groups, linear or branched; -COOR 8 groups, wherein R 8 is selected from C 1 -C 30 , preferably C 2 -C 20 , alkyl groups, linear or branched; or they represent a -CHO group, or a cyano (-CN) group; - R 3 is selected from C 1 -C 30 , preferably C 2 -C 20 , alkyl groups, linear or branched; optionally substituted cycloalkyl groups; optionally substituted aryl groups; C 1 -C 30 , preferably C 2 -C 20 , alkoxyl groups, linear or branched; - n is an integer ranging from 10 to 500, preferably ranging from 20 to 300. - R 1 and R 2 , the same as or different from each other, preferably the same as each other, are selected from C 1 -C 30 , preferably C 2 -C 20 , alkyl groups, linear or branched; optionally substituted cycloalkyl groups; optionally substituted aryl groups; optionally substituted heteroaryl groups; C 1 -C 30 , preferably C 2 -C 20 , alkoxyl groups, linear or branched; R 4 -O-CH 2 -CH 2 -O] n - polyoxyethylene groups, wherein R 4 is selected from C 1 -C 30 , preferably C 2 -C 20 , alkyl groups, linear or branched, and n is an integer ranging from 1 to 4; -R 5 -OR 6 groups, wherein R 5 is selected from C 1 -C 30 , preferably C 2 -C 20 , alkylene groups, linear or branched, and R 6 represents a hydrogen atom or is selected from C 1 -C 30 , preferably C 2 -C 20 , alkyl groups, linear or branched, or is selected from R 4 -[-OCH 2 -CH 2 -] p - polyoxyethylene groups, wherein R 4 has the same meanings as reported above and p is an integer ranging from 1 to 4; -COR 7 groups, wherein R 7 is selected from C 1 -C 30 , preferably C 2 -C 20 , alkyl groups, linear or branched; -COOR 8 groups, wherein R 8 is selected from C 1 -C 30 , preferably C 2 -C 20 , alkyl groups, linear or branched; or they represent a -CHO group, or a cyano (-CN) group; - R 3 is selected from C 1 -C 30 , preferably C 2 -C 20 , alkyl groups, linear or branched; optionally substituted cycloalkyl groups; optionally substituted aryl groups; C 1 -C 30 , preferably C 2 -C 20 , alkoxyl groups, linear or branched; - n is an integer ranging from 10 to 500, preferably ranging from 20 to 300. <EOS>