NOVELTY - An organic photoelectric-conversion element (10) comprises an transparent electrode (12), a photoelectric-conversion layer (14) containing conjugated polymer compound having partial structure (I) as p-type organic-semiconductor material and n-type organic-semiconductor material, and a counter electrode (13) sequentially formed on a transparent substrate (11).    USE - Organic photoelectric-conversion element is used for solar cell and optical sensor array (all claimed).    ADVANTAGE - The organic photoelectric-conversion element has high energy-conversion efficiency. The solar cell using the organic photoelectric-conversion element has high durability.    DETAILED DESCRIPTION - An organic photoelectric-conversion element comprises an transparent electrode (a), a photoelectric-conversion layer containing conjugated polymer compound having partial structure of formula (I) as p-type organic-semiconductor material and n-type organic-semiconductor material, and a counter electrode (b) sequentially formed on a transparent substrate.    R1,R2=H, halo, or 1-30C alkyl, 2-30C acyl, 1-30C alkoxy, amino, 2-30C alkylamino carbonyl, 2-30C alkylester, 2-30C alkoxycarbonyl, 2-30C acylamino, 6-30C aryl or 3-30C heterocyclyl (all optionally substituted);    X1,X2=sulfur atom, oxygen atom, substituted nitrogen atom, substituted carbon atom, or optionally substituted vinylene;and    Y',Z=single bond, oxygen atom, sulfur atom, substituted nitrogen atom, substituted silicon atom, substituted germanium atom, substituted carbon atom, substituted vinylidene, or substituted vinylene group, where Y' or Z is single bond.    INDEPENDENT CLAIMS are included for the following:    (1) solar cell; and    (2) optical sensor array.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic sectional view of organic photoelectric-conversion element.    Organic photoelectric-conversion element (10)    Substrate (11)    Transparent electrode (12)    Counter electrode (13)    Photoelectric-conversion layer (14)