Method for producing titanium oxide particles, titanium oxide particles, dispersion solution of titanium oxide particles, titanium oxide paste, titanium oxide film, and dye-sensitized solar cell

Abstract

A method for producing titanium oxide particles of the present invention includes a step of producing a mixed solution by mixing a hydrolysis product of a titanium alkoxide or a titanium metal salt and a compound having a five-membered ring containing nitrogen and a step of generating titanium oxide fine particles by heating and pressurizing the mixed solution. Titanium oxide particles of the present invention are produced by the method for producing titanium oxide particles of the present invention. A dispersion solution of titanium oxide particles of the present invention includes the titanium oxide particles of the present invention. Titanium oxide paste of the present invention includes the titanium oxide particles of the present invention, a solvent, and a binder. A titanium oxide film of the present invention is obtained by applying and calcinating the titanium oxide paste of the present invention. A dye-sensitized solar cell of the present invention includes a conductive substrate, a photosemiconductor electrode carrying a sensitizing dye, a counter electrode, and an electrolyte, and the photosemiconductor electrode has the titanium oxide film of the present invention.

1 . A dispersion solution of titanium oxide particles containing a compound having a five-membered ring containing nitrogen,
 wherein a ratio (D XRD(100) /D XRD(001) ) of a Scherrer diameter (D XRD(100) ) that is computed from a half-value width of a diffraction peak of a (100) plane to a Scherrer diameter (D XRD(001) ) that is computed from a half-value width of a diffraction peak of a (001) plane in an X-ray diffraction pattern of the titanium oxide particles is 0.2 to 1.0, a cumulant polydispersity index (PDI) of the titanium oxide particles measured on the basis of JIS Z8828 is 0.50 or less, and the titanium oxide particles have an anatase single phase.   
     
     
         2 . A titanium oxide paste comprising:
 titanium oxide particles;   a solvent;   a binder; and   a compound having a five-membered ring containing nitrogen,   wherein the titanium oxide particles have an anatase single phase, and the content of the compound having a five-membered ring containing nitrogen is 3 ppm to 50 ppm.   
     
     
         3 . A titanium oxide film obtained by applying and calcinating the titanium oxide paste according to  claim 2 . 
     
     
         4 . A dye-sensitized solar cell comprising:
 a conductive substrate;   a photosemiconductor electrode carrying a sensitizing dye;   a counter electrode; and   an electrolyte,   wherein the photosemiconductor electrode has the titanium oxide film according to  claim 3 .   
     
     
         5 . A titanium oxide paste comprising:
 the dispersion solution of the titanium oxide particles according to  claim 1 ;   a solvent; and   a binder.   
     
     
         6 . A titanium oxide film obtained by applying and calcinating the titanium oxide paste according to  claim 5 . 
     
     
         7 . A dye-sensitized solar cell comprising:
 a conductive substrate;   a photosemiconductor electrode carrying a sensitizing dye;   a counter electrode; and   an electrolyte,   wherein the photosemiconductor electrode has the titanium oxide film according to  claim 6 .