NOVELTY - Polymer material comprises at least one material consisting of first to seventh materials, where first material is at least two different repeating units each having quinoxaline backbone, second material is substituted quinoxaline repeating unit (I) and (II), third and fourth materials are substituted quinoxaline repeating units (III) and (IV), fifth material is substituted quinoxaline repeating units (V) and (VI) and sixth and seventh material are substituted quinoxaline repeating units (VII) and (VIII).    USE - The polymer material is useful in solar cell, and solar photovoltaic generation system (all claimed).    ADVANTAGE - The polymer material improves photoelectric conversion efficiency of solar cell.    DETAILED DESCRIPTION - Polymer material comprises at least one material consisting of first to seventh materials, where the first material is a polymer that includes at least two different repeating units each containing a quinoxaline backbone, and at least one of the repeating unit includes a halogen atom, the second material is a polymer that includes substituted quinoxaline repeating units of formula (I) and (II), that are different from each other, and at least one of (I) or (II) includes a halogen atom, the third material is a polymer that includes substituted quinoxaline repeating unit of formula (III), the fourth material is a polymer that includes substituted quinoxaline repeating unit of formula (IV), the fifth material is a polymer that includes substituted quinoxaline repeating unit of formula (V) and substituted quinoxaline repeating unit of formula (VI), that are different from each other, and at least one of the (V) or (VI) includes a halogen atom, the sixth material is a polymer that includes substituted quinoxaline repeating unit of formula (VII), and the seventh material is a polymer that includes substituted quinoxaline repeating unit of formula (VIII).    X1-X4, Y1-Y4 = S or Se;    Ar1-Ar4 = aromatic group (optionally substituted by a halo or substituent containing a halo); either    Ar5, Ar6 = aromatic group; or at least one of    Ar5, Ar6 = halo or substituent containing a halo;    A1, B1 = carbazole, fluorene or their derivatives; and    C1, D1 = aromatic ring.    INDEPENDENT CLAIMS are also included for:    (1) a solar cell comprising a positive electrode, a negative electrode, and a photoelectric conversion layer (13) which is interposed between the positive electrode and the negative electrode and contains the polymer material; and    (2) a solar photovoltaic generation system comprising the solar cell, an inverter which converts a direct current (DC) power output from the photovoltaic cell into an alternating current (AC) power, and a storage cell which stores at least a part of an excessive amount of power when the electric power output from the photovoltaic cell exceeds users power consumption, and outputs the stored electric power when the electric power output from the photovoltaic cell is below the users power consumption.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of the solar cell.    Substrate (10)    Electrode (11)    Photoelectric conversion layer (13)    Hole transport layer (14)    Electron transport layer (15)