NOVELTY - A conjugated polymer is new.    USE - New conjugated polymer for semiconductor device and photovoltaic device (all claimed).    ADVANTAGE - Product does not affect optical band gap, effectively adjusts molecule energy level, and improves photoelectric conversion efficiency of devices.    DETAILED DESCRIPTION - A conjugated polymer of formula (I) is new.    R1, R2=optionally substituted group A which is H, 1-30C alkyl, 1-30C alkoxy, ester, aryl, aralkyl, haloalkyl, heteroalkyl, alkenyl, single bond, double bond, triple bond, or combination of aryl substituents;    Ar1, Ar2=optionally substituted vinylene, ethynylene, monocyclic arylene, bicyclic arylene with at least 3 ring arylene, monocyclic heteroarylene, and bicyclic heteroarylenes with at least 3 rings in which bicyclic arylene with at least 3 rings arylene and bicyclic heteroarylene with at least 3 ring arylene are fused or joined by single bonds, and contains 1 or 2 substituents which are aryl, 1-30C alkyl, and 1-30C alkoxy;    A=electron deficient group which is optionally substituted vinylidene, ethynylene, monocyclic arylene, bicyclic arylene with at least 3 ring arylene, monocyclic heteroarylene, and bicyclic heteroarylene with at least 3 ring hetero arylene in which bicyclic arylene with at least 3 rings arylene and bicyclic heteroarylene with at least 3 ring arylene are fused or joined by single bonds, and contains 1 or 2 substituents which are aryl, 1-30C alkyl, and 1-30C alkoxy, or 2 adjacent groups on carbon atoms to form substituted ethylene group;    D=electron-rich group which optionally substituted vinylene, ethynylene, monocyclic arylene, bicyclic arylene with at least 3 ring arylene, monocyclic heteroarylene, and bicyclic heteroarylene with at least 3 ring arylene in which bicyclic arylene with at least 3 rings arylene and bicyclic heteroarylene with at least 3 ring arylene are fused or joined by single bonds; and    n=number of repeating units of polymer which is 1-5000.    INDEPENDENT CLAIMS are included for:    (1) preparation of conjugated polymer of formula (I);    (2) polymer of formulae (II)-(IV);    (3) usage of polymer for semiconductor compound which involves mixing with doping agent in which doping agent is fullerene or its derivative which is (6,6)-phenyl-C61-butyric acid methyl ester, (6,6)-phenyl-C71-butyric acid methyl ester, or indenyl-containing fullerene;    (4) usage of semiconductor compound for semiconductor devices which comprises thin film semiconductor devices, electrochemical devices, photovoltaic devices, and optoelectronic devices;    (5) photovoltaic device which comprises hole-collecting layer, electron collecting layer, photovoltaic material collecting layer which contains semiconductor compound, and hole between electron collector layer and photovoltaic material collecting layer; and    (6) photovoltaic device which comprises first electrode, second electrode spaced apart from first electrode, and at least one active material layer which contains polymer compound (I) disposed between first electrode and second electrode.    X=N, O, S, or Se;    R3, R4, R5, R6=4-20C alkyl or 4-20C alkoxy;    A'=S and/or N with hetero arylene; and    m=1-6.