NOVELTY - A light harvesting array has a substrate (A) comprising an electrode (A1), and layer of light harvesting rods comprising specified polymer electrically coupled to electrode (A1).    USE - For solar cell which is used in electrical device (both claimed).    ADVANTAGE - Light harvesting rods and light harvesting arrays with appropriate properties are produced using the polymer.    DETAILED DESCRIPTION - A light harvesting array has a substrate (A) comprising an electrode (A1), and layer of light harvesting rods comprising polymer of formula (I) electrically coupled to electrode (A1).    X1 = charge separation group having excited state of energy at most X2; and    X2-Xm+1 = chromophores, at least one of which has perylene group(s) such as perylene monoimide and perylene(bis) imide group coupled at perylene N-imide position or perylene-1,6,9 or 11- position.    INDEPENDENT CLAIMS are included for:    (i) solar cell which has the light harvesting array, substrate (B) comprising electrode (B1) and electrolyte in the space between the substrates. At least one of the substrates and electrodes are transparent;    (ii) electrical device which has a circuit electrically coupled to a solar cell;    (iii) composition comprising a non-polar organic solvent, and 2 microM to 100 mM of light harvesting rods comprising the polymer solubilized in the solvent;    (iv) manufacture of the composition which involves providing the monomers of polymer (I) in organic solvent with an amine and catalyst, polymerizing the monomer, and separating amine and catalyst from the mixture;    (v) compound of formula (VI), preferably compound of formula (II) or (III);    (vi) compound of formula (IV); and compound of formula (V).    Ar, Ar1, Ar2 = aromatic groups;    Y1,Y2 = perylene monoimide groups;    X = formyl, halo or 5-dipyromethane;    Porph = porphyrinic macromolecule;    Peryl1,Peryl2 = perylene groups; and    m,n = 1-3;    R1,R6,R9,Y2-Y6 = H, alkyl, aryl, alkoxy, aryloxy, alkylthio, arylthio, halo, ethynylalkyl, ethynylaryl, dialkyl boronate or trialkyl tin.    DESCRIPTION OF DRAWING(S) - The figure shows the absorption spectra of perylene-porphyrin arrays 9-11, porphyrin 17, perylene PMI-12' in toluene at room temperature.