NOVELTY - Conjugated polymer compound (I) comprising one of substituted aromatic compounds (Ia) and (Ib), is new.    USE - The conjugated polymer compounds are useful as electron donors to form active layer materials which are useful in an organic thin film solar cell (claimed).    ADVANTAGE - The conjugated polymer compounds: simultaneously increase the solubility of the conjugated polymer material and improve the morphology and the stability of the active layer as well; are light-sensitive materials having absorption of the full region of the solar spectrum, and easily processed which are applicable for the production of polymer solar cells with high efficiency and high stability; and provide the active layer material having high stability, thus the polymer solar cell, even when maintained in an unpackaged state and exposed to the air for over 600 hours, retains its optoelectronic conversion efficiency of greater than or equal to 90%.    DETAILED DESCRIPTION - Conjugated polymer compound (I) comprising one of substituted aromatic compounds of formulae (Ia) and (Ib), is new.    Q1 = pi which is unsaturated 3-16C aromatic ring or unsaturated 3-16C heteroaromatic ring, where the unsaturated 3-16C heteroaromatic ring includes at least one N, S, O or Se, and further includes 1-3 N;    A1, D1 = unsaturated 5- or 6-membered heterocyclic ring, unsaturated 5- or 6-membered heteroaromatic ring;    a, b = 1-20;    n = 1-100;    J1 = macromolecular heterocyclic compounds of formula (p1)-(p3);    G3 = Q1;    M1 = Zn2+ or 2H+;    S1, S2 = straight or branched, saturated 1-30C alkyl, or aryl, where the phenyl has phenyl (optionally substituted with at least H, halo, alkyl halide, CN, straight or branched, saturated 1-30C alkyl, straight or branched, saturated 1-30C alkoxy, straight or branched, saturated 1-30C alkylthio, straight or branched, saturated 1-30C ester, or straight or branched, saturated 1-30C acetyl);    Z1 = -CCH, 4-dimethylamino-phenylethynyl, 4-cyano-phenylethynyl, 4-nitro-phenylethynyl, substituted 4-Formyl-phenylethynyl of formula (z1), substituted 9H-fluoren-2-ylethynyl of formula (z2), phenanthren-9-ylethynyl or pyren-1-ylethynyl;    R1 = H, straight or branched, saturated 1-30C alkyl, or 6-16C aryl; and    U1 = OR1, Cl, Br or I.    INDEPENDENT CLAIMS are also included for:    (1) a conjugated polymer compound (II), comprising a conjugated polymeric main chain, and a porphyrin compound having an absorption in a blue light region of solar radiation, and bonded to the polymeric main chain to form a side chain on the polymeric main chain; and    (2) a conjugated polymer compound (III) comprising a main chain and a side chain, where the side chain includes a porphyrin compound.