TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Materials: The solid substance contains a pi-conjugated compound. The conversion element has an electron transporting layer in which oxide fine particles are sintered and a charge separation layer on the electron transport layer where a photosensitivity-increasing compound is absorbed. Alternatively, the solid photoelectric conversion element is formed comprising a solid substance containing a photosensitivity-increasing compound and a pi-conjugated compound, and has a surface resistance of the outermost layer of at most 1000 (at most 100) ohm/square. This element has the photosensitivity-increasing compound on the surface of the metal oxide and has the pi-conjugated compound in at least part of the pores of the metal oxide. The pi-conjugated compound is a pi-conjugated oligomer or polymer, e.g. an oligo-thiophene derivative, oligo-para-phenylene derivative, an oligo-pyrrole derivative, an oligo-para-phenylene-vinylene derivative, a polythiophene derivative, a polyphenylene derivative, a polypyrrole derivative, a poly-para-phenylene-vinylene derivative, etc. A specific complex is e.g. ferrocene. The photosensitivity-increasing compound is a ruthenium complex dye (e.g. cis-di(thiocyanato)- N,N-bis(2,2'-bipyridyl- 4,4'-dicarboxylic acid) ruthenium (II)), porphyrin compound, phthalocyanine compound, perylene dye and/or eosine dye. The photo conversion element is formed one or many single cell elements and the transmittance of light when light of wavelength 500 nm is irradiated at these cell elements is at least 5 %. The single cells have flexibility in at least 2 axes on the electrode surface. EXAMPLE - A suspension of titanium oxide particles is coated on a transparent conductive glass of thickness 1 mm and sintered. Next, cis-di(thiocyanato)-N,N-bis (2,2'-bipyridyl- 4,4'-dicarboxylic acid) ruthenium (II) is chemically absorbed to form an electrode which is immersed in a mixed solution of 3,4-ethylenedioxythiophene (0.070 g), anhydrous tris-para-toluene sulfonic acid iron (III) salt (0.547 g) and imidazole (0.050 g), dissolved in methanol (2.000 g). After heating for 5 minutes at 110 degrees C, poly(3,4-ethylene dioxythiophene) doped with tris-para-toluene-sulfonic acid anions is deposited in the pores.