TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The derivatized anthra(2,3-b:6,7-b')dithiophene based monomer is formed into a derivatized anthra(2,3-b:6,7-b')dithiophene based polymer of formula 2.n=1-100.The anthra(2,3-b:6,7-b')dithiophene based polymer is selected from poly(5,11-bis(5-(2-ethylhexyl)furan-2-yl)anthra(2,3-b:6,7-b')dithiophene-2,8-diyl-alt-2-ethyl-1-(thieno(3,4-b)thiophen-2-yl)hexan-1-one-4,6-diyl), poly(5,11-bis(5-(2-ethylhexyl)thiophen-2-yl)anthra(2,3-b:6,7-b')dithiophene-2,8-diyl-alt-2-ethyl-1-(thieno(3,4-b)thiophen-2-yl)hexan-1-one-4,6-diyl) and poly(5,11-bis(5-(2-ethylhexyl)selenophen-2-yl)anthra(2,3-b:6,7-b')dithiophene-2,8-diyl-alt-2-ethyl-1-(thieno(3,4-b)thiophen-2-yl)hexan-1-one-4,6-diyl). The acceptor is selected from PC70BM, BisIndene-C70, BisPC70BM, BisBenzene-C70, TrisPC70BM and PC76BM. Preferred Composition: The monomer solution comprises benzene, thiophene, pyrole, pyridine or thiazole derivatized anthra(2,3-b:6,7-b')dithiophene monomer dissolved in anhydrous tetrahydrofuran, from about 3 to about 5 mmol; or the monomer solution comprises a thiophene derivatized anthra(2,3-b:6,7-b')dithiophene monomer dissolved in anhydrous tetrahydrofuran, from about 3 to about 5 mmol; or the monomer solution comprises a furan derivatized anthra(2,3-b:6,7-b')dithiophene monomer dissolved in anhydrous tetrahydrofuran, from about 3 to about 5 mmol; or the monomer solution comprises a furan derivatized anthra(2,3-b:6,7-b')dithiophene monomer dissolved in anhydrous tetrahydrofuran, from about 3 to about 5 mmol. Preferred Definitions:    Ar1=selected from benzene, thiophene, pyrole, pyridine, thiazole and its derivatives; selected from thiophene and its derivatives; selected from furan and its derivatives; selected from selenophene and its derivatives; or R selected from hydrogen, 1-15C alkyls and 1-15C alkoxys; or R selected from 4-10C alkyls and 4-10C alkoxys;    Ar'=R and R' both selected from hydrogen, 1-15C alkyls and 1-15C alkoxys; or both selected from 4-10C alkyls and 4-10C alkoxys; and    n=1-50.    EXAMPLE - No suitable example given.