Titanium dioxide paste, porous semiconductor electrode substrate, photoelectrode, and dye-sensitized solar cell

Patent metadata

Field	Value
Publication number	US-2022084757-A1
Application number	US-202017424498-A
Country	US
Kind code	A1
Filing date	Jan 27, 2020
Priority date	Jan 31, 2019
Publication date	Mar 17, 2022
Grant date	—

Abstract

Provided is a titanium dioxide paste that can form a porous semiconductor layer having excellent close adherence with a conductive substrate. The titanium dioxide paste contains titanium dioxide nanoparticles and water, and has a pH of not lower than 2.6 and not higher than 3.5.

First claim

1 . A titanium dioxide paste comprising titanium dioxide nanoparticles and water, and having a pH of not lower than 2.6 and not higher than 3.5.

2 . The titanium dioxide paste according to claim 1 , wherein a curve indicating a frequency distribution obtained through particle size distribution measurement, by mass, of the titanium dioxide nanoparticles has at least two peaks.

3 . The titanium dioxide paste according to claim 2 , wherein the at least two peaks include a fine particle peak having a peak top at a particle diameter of not less than 10 nm and not more than 40 nm and a coarse particle peak having a peak top at a particle diameter of not less than 60 nm and not more than 200 nm.

4 . The titanium dioxide paste according to claim 3 , wherein a ratio of frequency at the peak top of the coarse particle peak relative to frequency at the peak top of the fine particle peak is more than 1/3.

5 . The titanium dioxide paste according to claim 1 , having a solid content concentration of not less than 45 mass % and not more than 55 mass %.

6 . The titanium dioxide paste according to claim 1 , having a viscosity at 25° C. of not less than 10 Pa·s and not more than 24 Pa·s.

7 . The titanium dioxide paste according to claim 1 , not substantially comprising a binder.

8 . A porous semiconductor electrode substrate comprising: a conductive substrate; and a porous semiconductor layer formed by applying the titanium dioxide paste according to claim 1 onto the conductive substrate and drying the titanium dioxide paste that has been applied.

9 . A photoelectrode comprising:
the porous semiconductor electrode substrate according to claim 8 ; and a dye or light-absorbing material adsorbed to the porous semiconductor layer of the porous semiconductor electrode substrate.

10 . A dye-sensitized solar cell comprising the porous semiconductor electrode substrate according to claim 8 .

Assignees

• Zeon Corp

Inventors

• Shimizu Motohiro

Classifications

• H01G9/07

  Dielectric layers · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01G23/07

  Producing by vapour phase processes, e.g. halide oxidation · CPC title

• C01P2004/53

  bimodal size distribution · CPC title

• C01P2004/64

  Nanometer sized, i.e. from 1-100 nanometer · CPC title