TECHNOLOGY FOCUS - POLYMERS - Preferred Article: In the article, The electron withdrawing group is COR, COOR, CO-N(RR'), 1-20C perfluoroalkyl, CN, or SO3R.R or R'=independently, is H, 1-24C alkyl, aryl, heteroaryl, 3-24C cycloalkyl, or 3-24C-heterocycloalkyl.Also, the electron withdrawing group is COOC8H17, COOC10H21, COOC12H25, COOC14H29, COOC16H33, CO-N(C4H9)2, or CO-N(C8H17)2. The benzodithiophene moiety is substituted with two electron withdrawing groups. The first monomer repeat unit comprises a benzodithiophene moiety of Formula 1 or 2.R1 and R2=independently, is H or an electron withdrawing group; or COR, COOR, CO-N(RR'), 1-20C perfluoroalkyl, CN, or SO3R; or COOC8H17, COOC10H21, COOC12H25, COOC14H29, COOC16H33, CO-N(C4H9)2, or CO-N(C8H17)2;R3 and R4=independently, is H, halo, 1-24C alkyl, 1-24C alkoxy, aryl, heteroaryl, 3-24C cycloalkyl, 3-24C heterocycloalkyl, COR'', or COOR'', preferably H; andR''=H, 1-24C alkyl, aryl, heteroaryl, 3-24C cycloalkyl, or 3-24C heterocycloalkyl.The polymer further comprises a second monomer repeat unit different from the first monomer repeat unit, where the second monomer repeat unit comprises a benzodithiophene moiety, a cyclopentadithiazole moiety, a benzothiadiazole moiety, a thiadiazoloquinoxaline moiety, a benzoisothiazole moiety, a benzothiazole moiety, a dithienopyrrole moiety, a dibenzosilole moiety, a thienothiophene moiety, a carbazole moiety, a dithienothiophene moiety, a tetrahydroisoindole moiety, a fluorene moiety, a silole moiety, a cyclopentadithiophene moiety, a thiazole moiety, a selenophene moiety, a thiazolothiazole moiety, a naphthothiadiazole moiety, a thienopyrazine moiety, a silacyclopentadithiophene moiety, a thiophene moiety, an oxazole moiety, an imidazole moiety, a pyrimidine moiety, a benzoxazole moiety, a benzimidazole moiety, a quinoxaline moiety, a pyridopyrazine moiety, a pyrazinopyridazine moiety, a pyrazinoquinoxaline moiety, a thiadiazolopyridine moiety, a thiadiazolopyridazine moiety, a benzooxadiazole moiety, an oxadiazolopyridine moiety, an oxadiazolopyridazine moiety, a benzoselenadiazole moiety, a benzobisoxazole moiety, a thienothiadiazole moiety, a thienopyrroledione moiety, or a tetrazine moiety, represented by Formulas 1-44, respectively.X and Y=independently, is CH2, O, or S; andR3, R4, R5, R6, R7, and R8=independently, is H, halo, 1-24C alkyl, 1-24C alkoxy, aryl, heteroaryl, 3-24C cycloalkyl, 3-24C heterocycloalkyl, COR'', or COOR''.The second monomer repeat unit comprises a benzothiadiazole moiety of formula (4), a thienothiophene moiety of formula (10), a thiazolothiazole moiety of formula (20), a thienopyrazine moiety of formula (22), a pyrazinopyridazine moiety of formula (32), or a thienothiadiazole moiety of formula (42). The polymer further comprises a third monomer repeat unit different from the first and second monomer repeat units, where the third monomer repeat unit comprises a thiazole moiety or a thiophene moiety. Alternatively, the article comprises: a first electrode, a second electrode, and a photoactive material disposed between the first and second electrodes, the photoactive material comprising a polymer including first and second monomer repeat units, the first monomer repeat unit comprising a benzodithiophene moiety and the second monomer repeat unit comprising a thiazolothiazole moiety; where the article is configured as a photovoltaic cell. The benzodithiophene moiety is substituted with at least one or two OR groups, in which R is 1-24C alkyl, 1-24C alkoxy, aryl, heteroaryl, 3-24C cycloalkyl, 3-24C heterocycloalkyl, preferably 1-24C alkyl. The first monomer repeat unit comprises the benzodithiophene moiety of Formula 1 or 2. The second monomer repeat unit comprises the thiazolothiazole moiety of Formula 20. Preferred Polymers: The polymer further comprises a second monomer repeat unit different from the first monomer repeat unit; and a third monomer repeat unit different from the first and second monomer repeat units. Alternatively, the polymer comprises: first and second monomer repeat units, the first monomer repeat unit comprising a benzodithiophene moiety and the second monomer repeat unit comprising a thiazolothiazole moiety. EXAMPLE - No suitable example given.