NOVELTY - A light harvesting rod composition comprises an oligomer.    USE - For light harvesting rods used in solar cell for electrical devices, e.g. radios, televisions, computers (e.g. personal computers), processors, calculators, telephones, wireless communication devices (e.g. pagers), watches, emergency location devices, electric vehicles, emergency power supplies, power generators, lights or lamps, and other illuminating devices, monitoring devices, inspection devices, radiation detectors, imaging devices, and optical coupling devices.    ADVANTAGE - The invention has intense absorption in the visible region, a narrow distribution of energies of the excited state, and an excited single-state lifetime sufficient for energy transfer. It does not require high temperature annealing steps to reduce internal resistances and does not have any losses associated with transporting charge through thick semiconductor films.    DETAILED DESCRIPTION - A light harvesting rod composition comprises an oligomer of formula A1(Ab+1)b (I).    INDEPENDENT CLAIMS are included for:    (1) a light harvesting array comprising a first substrate containing a first electrode, and a layer of light harvesting rods electrically coupled to the first electrode;    (2) a solar cell comprising the inventive light harvesting array, a second substrate comprising a second electrode, and an electrolyte in the space between the substrates;an electrical device comprising the solar cell, and a circuit electrically coupled to the solar cell;    (3) a method of making a light harvesting rod composition comprising coupling rod segments of formulae E(X1(Xm+1)m)1F and G(X1(Xm+1)m)2H.    b = at least 1;    A1 through Ab+1 = covalently coupled rod different segments having less positive electrochemical potentials; or a compound of formula X1(Xm+1)m;    m = at least 1;    X1 through Xm+1 = covalently coupled porphyrinic macrocycles;    E = end group;    Either F or G = ethynyl group;and    the other F or G is halo; H = end group.    DESCRIPTION OF DRAWING(S) - The figure shows molecular physics considerations for designing light-harvesting rods.