NOVELTY - A composite material contains cyano group-containing compound or its reduced form salt adsorbed to surface of metal oxide. The cyano group-containing compound, which is not adsorbed to metal oxide exhibits absorption at different wavelength region from ultraviolet region to near-infrared region in adsorption spectrum.    USE - Composite material is used for photoelectric conversion material, photoelectric transducer and dye-sensitized solar cell element (all claimed).    ADVANTAGE - The composite material provides photoelectric conversion material having excellent photoelectric conversion efficiency, and solar cell element capable of efficiently converting light of broad wavelength range.    DETAILED DESCRIPTION - A composite material contains cyano group-containing compound or its reduced form salt adsorbed to surface of metal oxide. The cyano group-containing compound, which is not adsorbed to metal oxide exhibits absorption at different wavelength region from ultraviolet region to near-infrared region in adsorption spectrum. The cyano group-containing compound is of formula: C(-NC)2=R, 60C fullerene or of formulae (2-13, 13A and 13B).    R=aliphatic, aromatic or heterocyclic group;    R1-R12=H, aliphatic group, aromatic group, heterocyclic group or halo;and    Ra-Rf=R1 optionally having substituent and cyano groups, and the carbon number of aliphatic, aromatic or heterocyclic group is 30 or less.    INDEPENDENT CLAIMS are included for the following:    (1) dye-sensitized solar cell element (10), which has a primary electroconductive layer (12) formed on a substrate (11), a platinum catalyst layer formed on electroconductive layer, electrolyte layer (13) formed on catalyst layer, a pigment adsorption metal oxide layer (14) formed on electrolyte layer, secondary electroconductive layer (15) formed on metal oxide layer, and substrate (16) formed on electroconductive layer. The metal oxide layer contains 7,7,8,8-tetracyano quinodimethane adsorbed to anatase type titanium oxide;    (2) manufacture of photoelectric transducer, which involves arranging pigment adsorption metal oxide layer between two electrodes; and    (3) analysis of titanium oxide crystal structure, which involves analyzing information of crystal structure of titanium oxide by adsorbing cyano compound to titanium oxide.    DESCRIPTION OF DRAWING(S) - The drawing shows the cross-sectional view of dye-sensitized solar cell.    Dye-sensitized solar cell element (10)    Glass substrate (11)    Electroconductive layer (12)    Electrolyte layer (13)    Pigment adsorption metal oxide layer (14)    Transparent conductive layer (15)    Glass substrate (16)