TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The organic sensitizing dye is formula Dye-(A)n1 (1). The organic sensitizing dye is dye of donor acceptor type. The organic dye is formula (1A). The organic sensitizing dye is formula (2) or (4). The organic sensitizing dye is formula (5). The organic sensitizing dye is dye with adsorption-equilibrium constant of 500-7000 g/L with respect to titanium oxide. The solvent at the time of adsorbing organic sensitizing dye is carbonate ester such as ethylene carbonate, propylene carbonate, vinylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate or dipropyl carbonate; lactone such as gamma -butyrolactone, gamma -valerolactone, gamma -caprylolactone, crotonolactone, gamma -caprolactone or delta -valerolactone; ethers such as ethyl ether, 1,2-dimethoxyethane, diethoxy ethane, trimethoxy methane, ethylene glycol dimethyl ether, polyethyleneglycol dimethyl ether, 1,3-dioxolane or 1,4-dioxane; alcohol such as methanol, ethanol, ethylene glycol monomethyl ether, propylene glycol momoethyl ether, polyethyleneglycol monoalkylether or polypropylene glycol monoalkylether; glycols such as ethylene glycol, propylene glycol, polyethyleneglycol, polypropylene glycol or glycerol; glycol ethers such as ethylene glycol dialkyl ether, propylene glycol dialkyl ether, polyethylene glycol dialkyl ether or polypropylene glycol dialkyl ether; tetrahydrofuran such as tetrahydrofuran or 2-methyltetrahydrofuran; nitriles such as acetonitrile, glutaro dinitrile, propionitrile, methoxy acetonitrile or benzonitrile; carboxylate esters such as methyl formate, methyl acetate, ethyl acetate or methyl propionate; phosphate triester such as trimethyl phosphate or phosphoric acid triethyl; heterocyclic compounds such as N-methylpyrrolidone, 4-methyl-1,3-dioxane, 2-methyl-1,3-dioxolane, 3-methyl-2-oxazolidinone, 1,3-propane sultone or sulfolane; or aprotic organic solvents such as dimethylsulfoxide, formamide, N,N-dimethylformamide or nitromethane. The photoelectric conversion element comprises composite sensitizing dye which combined organic sensitizing dye and metal complex sensitizing dye. The metal complex sensitizing dye is formula Mz(LL11)m11(LL12)m12(X)m13.DI (13).Dye=pigment molecule;A=acidic group;n1=integer;R=H or substituent;X1-X3=ring structure formed by R;X=nonmetallic atom group required in order to form nitrogen-containing 4-7 membered ring by bonding with benzene ring;R1=heterocyclic group bonded with hydrogen atom, aliphatic group, aromatic group, or carbon atom;R2-R9=H or substituent which consists of dye residue of formula -(C(R10)=C(R11))r-C(R13)=R12 (3);R10,R11,R13=H, aliphatic, aromatic, or heterocyclic;r= greater than or equal to 0;R12=group or acidic nucleus which has an acidic group;A=atomic group required in order to form ring with carbon-nitrogen bond;Y1,Y2=acidic group on one side, and electron attractive group on other side;D=dye residue;n= greater than or equal to 1;L=single bond or bivalent coupling group;Y3=acidic group;Mz=metal atom;LL11=ligand of bidentate of formula (14), or tridentate;LL12=ligand of bidentate of formula (15), or tridentate;m11,m12=0-3;m13=0-2;DI=counter-ion;X=ligand of monodentate which consists of acyloxy, acylthio group, thio acyloxy, thio acylthio, acylamino oxy, thiocarbamate, dithiocarbamate, thio carbonate, dithio carbonate, trithio carbonate, acyl, thiocyanate, isothiocyanate, cyanate, isocyanate, cyano, alkylthio, arylthio, alkoxy, or aryloxy group; ligand of monodentate which consists of halogen atom, carbonyl, dialkyl ketone, 1,3-diketone, carbonamide, thio carbonamide, or thiourea; or ligand of bidentate;R101,R102=carboxyl, sulfonic acid, hydroxyl, hydroxamic acid, phosphoryl, or phosphonyl;R103,R104=substituent;R105,R106=aryl or heterocyclic group;d1,d2= greater than or equal to 0;L1,L2=substituted or unsubstituted ethenylene group and/or ethynylene group;a1,a2=0-3;b1,b2=0-3;Za-Zc=nonmetallic atom group which can form 5- or 6-membered ring, and may have acidic group;c=0 or 1; andd3= greater than or equal to 0.Preferred Parameter: The unit surface area of semiconductor material to which organic sensitizing dye is made to adsorb is 5x 10-8-1x 10-6 mol/cm2.