NOVELTY - Electrode layer comprises a porous film made of oxide semiconductor fine particles sensitized with a pyridinium dye (I).    USE - (I) is useful in the electrode layer in a photoelectric conversion device that is useful in a dye sensitized solar cell (all claimed).    ADVANTAGE - The photoelectric conversion devices sensitized with (I) have excellent overall properties, preferably they have a high photo-electric power conversion efficiency.    DETAILED DESCRIPTION - Electrode layer comprises a porous film made of oxide semiconductor fine particles sensitized with a pyridinium dye of formula (D-(C(R1)=C(R2))n-A) (I).    n = 1-6;    A = pyridinium group of formula (a1) or (a2);    Y1 = inorganic or organic anion;    R1, R2 = 1-20C alkyl (optionally interrupted by O, S and/or NR14), 6-20C aryl (optionally substituted by 1-3 1-8C alkyl), H, 4-20 heteroaryl or D;    R29 = 1-20C alkyl (optionally interrupted by O, S and/or NR14), 6-20C aryl (optionally substituted by 1-3 1-8C alkyl), 4-20C heteroaryl, O, OR32 or 7-20C aralkyl (optionally substituted at the aryl by 1-3 of 1-8C alkyl);    R30 = 1-20C alkyl (optionally interrupted by O, S and/or NR14), G, H, OR32, 6-20C aryl (optionally substituted by 1-3 1-8C alkyl) or 4-20C heteroaryl;    R31 = H or D-(C(R1)=C(R2))n-;    R32 = 1-20C alkyl (optionally interrupted by O, S and/or NR14), 6-20C aryl, 4-20C heteroaryl or 6-20C aryl (substituted by 1-3 of 1-8C alkyl);    G = -R28-COOH, -R28-COO-Z+, -R28-SO3H, -R28-SO3-Z+, -R28-OP(O)(O-Z+)2, -R28-OP(O)(OH)2 or -R28-OP(O)(OH)O-Z+;    R28 = direct bond, 1-20C alkylene, 2-4C alkenylene or 6-10C arylene;    Z+ = organic or inorganic cation;    D = phenyl group of formula (d1) or (d2); either    R17, R18 = 1-20C alkyl, 2-20C alkenyl, 2-20C alkynyl, 6-20C aryl, 4-24C heteroaryl, 7-20C aralkyl, 8-20C aralkenyl, 8-20C aralkynyl, 4-20C cycloalkyl, 5-20C cycloalkenyl or 6-20C cycloalkynyl (all optionally substituted), where the alkyl and cycloalkyl are optionally interrupted by O, S and/or NR14; or    R17R18, R17R22, R17R20 and/or R18R19 = 5-7 membered ring (optionally substituted);    R15, R16, R19-R24 = 1-20C alkyl, 6-20C aryl, 2-20C alkenyl, 2-20C alkynyl, 6-20C aryl, 4-20C heteroaryl, 7-20C aralkyl, 8-20C aralkenyl, 8-20C aralkynyl, 4-20C cycloalkyl, 5-20C cycloalkenyl or 6-20C cycloalkynyl (all optionally substituted and the alkyl and cycloalkyl are optionally interrupted by O, S and/or NR14), H, NR25R26, OR25, SR25, NR25-NR26R27, NR25-OR26, O-CO-R25, O-CO-OR25, O-CO-NR25R26, NR25-CO-R26, NR25-CO-OR26, NR25-CO-NR26R27, CO-R25, CO-OR25, CO-NR25R26, S-CO-R25, CO-SR25, CONR25-NR26R27, CO-NR25-OR26, CO-O-CO-R25, CO-O-CO-OR25, CO-O-CO-NR25R26, CO-NR25-CO-R26 or CO-NR25-CO-OR26;    R25-R27 = 1-20C alkyl, 6-20C aryl, 2-20C alkenyl, 2-20C alkynyl, 6-20C aryl, 4-20C heteroaryl, 7-20C aralkyl, 8-20C aralkenyl, 8-20C aralkynyl, 4-20C cycloalkyl, 5-20C cycloalkenyl or 6-20C cycloalkynyl (all optionally substituted and the alkyl and cycloalkyl are optionally interrupted by O, S and/or NR14) or H; and    R14 = H or 1-20C alkyl.    An INDEPENDENT CLAIM is included for (I).