TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Agent: The nitrogen-containing organic charge-transfer agent of formula (I) is any one of formulae Ar2N(Ar3)Ar1 (I-1), Ar5N(Ar6)Ar7XAr8N(Ar9)Ar10 (I-2), Ar11N(Ar12)Ar13(N(Ar14)Ar15)nN(Ar16)Ar15 (I-3), R1N(Ar18)Ar19C(R3)=C(Ar20)AR21 (I-4), (I-5), R1C(Ar28)=CHCH=C(R4)Ar31N(Ar29)Ar30 (I-6) and R1N(R2)Ar32C(R3)=NN(Ar33)Ar34 (I-7).Ar2-Ar6, Ar9, Ar12, Ar14, Ar16- Ar18, Ar20- Ar26, Ar28-Ar30, Ar33, Ar34 = aryl group;Ar7, Ar8, Ar13, Ar15, Ar19, Ar31, Ar32 = arylene group;X = single bond, -O-, -S-, -SO-, -SO2-, -CO-, 1-12C alkylene, 5-8C cyclic alkylene or arylene group;n = 1-6;R1-R3 = alkyl or aryl group;Ar27 = trivalent aromatic hydrocarbon group;R1, R4 = H, alkyl or aryl group.The nitrogen-containing compound of formula (I-1) is preferably a compound of formula (I-1-x).R5-R7 = alkyl group or substituent of formula (b-1)-(b-4).Compound of formula (I-2) is preferably a compound of formula (A).R8, R9 = H or alkyl group;R10, R11 = group of formula (c-1).Compound of formula (I-7) is preferably a compound of formula (B).R12 = alkyl group; andR13, R14 = group of formula (b-1 to b-4). EXAMPLE - A titanium-dioxide dispersion liquid containing Solarnix-D (TM) (titanium-dioxide paste) having mean particle diameter of 13 nm, was applied on the surface of a glass, and a nanocrystal titanium dioxide layer (1) of 3.1 microns thickness was formed. Layer (1) was sensitized by immersing the obtained layer in solution containing acetonitrile N-719 (TM) (ruthenium complex pigment). The absorption amount of pigment per surface area of the layer was 1.3x10 power -7 mol/cm2. Tri(methylphenyl)amine as nitrogen-containing organic charge-transfer agent (a), methyl hexyl imidazolium iodide as imidazolium salt, and lithium thiocyanate as thiocyanate, were dissolved in chlorobenzene or acetonitrile to obtain charge transferring layer solution (b) containing agent (a) (in mass%) (10), salt (50) and thiocyanate (6.4). The obtained solution was dropped on layer (1) and the solvent was volatilized at 60degreesC for 1 hour. The obtained solution (b) was filled between the semiconductor nanoparticles in layer (1). A platinum layer of 100 nm thickness was covered as counter electrode on indium tin oxide (ITO) layer of the ITO electrically conductive glass, and a counter-electrode electroconductive layer (2) was formed. The obtained layer (1), charge transferring layer and the obtained layer (2) were sequentially provided on an electroconductive layer to form an optoelectric transducer having short circuit current density of 0.1 mA/cm2, open circuit voltage of 0.64 V, filling factor of 0.7 and optoelectric conversion efficiency of 5.87.