NOVELTY - Article, comprises a first electrode, a second electrode, and a photoactive material disposed between the first and second electrodes, where the photoactive material comprises a polymer including first and second comonomer repeat units, the first comonomer repeat unit comprises a phenyl moiety substituted with 2-4 halo or 2-4 1-4C trihaloalkyl, and the second comonomer repeat unit comprises e.g. a benzodithiophene moiety, a cyclopentadithiazole moiety, a benzothiadiazole moiety, a thiadiazoloquinoxaline moiety, a benzoisothiazole moiety, a benzothiazole moiety and a dibenzosilole moiety.    USE - The article is useful as a photovoltaic cell (claimed).    ADVANTAGE - The photovoltaic cell has improved open circuit voltage and improved energy conversion efficiency. The article can be manufactured by reduced cost, due to readily preparing a photoactive layer with such a thickness by using continuous roll-to-roll process.    DETAILED DESCRIPTION - Article, comprises: a first electrode, a second electrode, and a photoactive material disposed between the first and second electrodes, where the photoactive material comprises a polymer (aa) including first and second comonomer repeat units, the first comonomer repeat unit comprises a phenyl moiety substituted with 2-4 halo or 2-4 1-4C trihaloalkyl, and the second comonomer repeat unit comprises a benzodithiophene moiety, a cyclopentadithiazole moiety, a benzothiadiazole moiety, a thiadiazoloquinoxaline moiety, a benzoisothiazole moiety, a benzothiazole 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 thiazolothiazole moiety, a naphthothiadiazole moiety, a thienopyrazine moiety, a silacyclopentadithiophene moiety, an oxazole moiety, an imidazole moiety, a pyrimidine moiety, a benzoxazole moiety, a benzimidazole 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, a tetrazine moiety, a pyrrolopyrroledione moiety, or a benzotriazole moiety. An INDEPENDENT CLAIM is also included for the polymer (aa) comprising first and second comonomer repeat units.    DESCRIPTION OF DRAWING(S) - The figure shows the cross-sectional view of the photovoltaic cell.    Substrate (110)    Electrode (120)    Hole blocking layer (130)    Photoactive layer (140)    Hole carrier layer (150)