TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Electrode: The electrode (12) has surface area of 1-10000 times of apparent surface area. The electrode (12) contains transparent electroconductive nanoparticles having average particle diameter of 0.1-1000 nm. Electrode (C) contains an electroconductive nanoparticle. The work function of electrode (12) is lesser than the work function of electrode (C). The work function of electrode (12) in front of a chemical bond is same as work function in the excitation level of organic compound (13) in front of a chemical bond or more. The work function of electrode (C) in front of a chemical bond is same as work function in the base level of the organic compound (13) in front of a chemical bond or less. Preferred Method: Electrode (12) and/or electrode (C) are held on a support substrate (11). The transparent electroconductive nanoparticle in electrode (12) is obtained by application process on top of the support substrate. The electroconductive nanoparticle in electrode (C) is formed by contacting with colloid dispersion liquid formed by dispersing organic compound (13) and predetermined electroconductive fine particle, after chemically coupling the metal with respect to organic compound (13). The predetermined metal is reduced with respect to organic compound (13), after chemically coupling with organic compound (13). The reduction is implemented by immersing into a predetermined reducing solution. Preferred Solution: The reducing solution contains organic reducing agent or iodine ion, sulfide ion, iron ion, bromide ion and/or vanadium ion, preferably alkali metal compound(s) chosen from lithium iodide, lithium bromide, sodium iodide, sodium bromide, sodium sulfide, potassium iodide, potassium bromide and potassium sulfide, or an alkyl-halide imidazolium salt, or quaternary ammonium salt.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compound: The compound (13) contains sensitizing dye capable of carrying out optical pumping in 300-1500 nm.