Method for producing photochemical electrode

Patent metadata

Field	Value
Publication number	US-11322310-B2
Application number	US-202016902404-A
Country	US
Kind code	B2
Filing date	Jun 16, 2020
Priority date	Apr 28, 2016
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

A photochemical electrode includes: an electrically conductive layer; and a photoexcitation material layer provided over the electrically conductive layer and including a photoexcitation material, wherein the photoexcitation material layer is one of a first photoexcitation material layer in which a potential of the conduction band minimum decreases from a second surface opposite to a first surface on the side of the electrically conductive layer toward the first surface and a second photoexcitation material layer in which a potential of the valence band maximum decreases from the second surface toward the first surface.

First claim

What is claimed is:

1. A method for producing a photochemical electrode, comprising:
preparing an electrically conductive layer including a metal or a metal oxide;
forming a first layer by spraying a powder of a first photoexcitation material over the electrically conductive layer;
forming, over the first layer, a second layer by spraying a first solid solution including the first photoexcitation material and a second photoexcitation material which is different from the first photoexcitation material and a first ratio which is a ratio between the first photoexcitation material and the first photoexcitation material;
forming, over the second layer, a third layer by spraying a second solid solution including the first photoexcitation material and the second photoexcitation material and a second ratio which is a ratio between the first photoexcitation material and the first photoexcitation material and is different from the first ratio;
forming, over the third layer, a fourth layer by spraying a third solid solution including the first photoexcitation material and the second photoexcitation material and a third ratio which is a ratio between the first photoexcitation material and the first photoexcitation material and is different from the first ratio and the second ratio;
forming, over the fourth layer, a fifth layer by spraying a fourth solid solution including the first photoexcitation material and the second photoexcitation material and a fourth ratio which is a ratio between the first photoexcitation material and the first photoexcitation material and is different from the first ratio, the second ratio and the third ratio; and
annealing a laminated layer including the first layer, and the second layer, the third layer, the fourth layer and the fifth layer at a specific temperature in a specific atmosphere.

2. The method for producing the photochemical electrode according to claim 1 , wherein the first photoexcitation material is GaN and the second photoexcitation material is ZnO.

3. The method for producing the photochemical electrode according to claim 1 , wherein the spraying is performed by an aerosol-type nanoparticle deposition (NPD) process.

4. The method for producing the photochemical electrode according to claim 1 , wherein the laminated layer is annealed at 600° C. temperature in a nitrogen atmosphere.

5. The method for producing the photochemical electrode according to claim 1 , wherein the photochemical electrode includes a first photoexcitation material layer of the first photoexcitation material in which a potential of the conduction band minimum decreases from a second surface opposite to a first surface on the side of the electrically conductive layer toward the first surface or a second photoexcitation material layer of the second photoexcitation material in which a potential of the valence band maximum decreases from the second surface toward the first surface.

Assignees

• Fujitsu Ltd

Inventors

• Imanaka Yoshihiko
• Amada Hideyuki
• Manabe Toshio
• Anazawa Toshihisa
• Ido Sachio
• Awaji Naoki

Classifications

• H01G9/2027 Primary

  comprising an oxide semiconductor electrode · CPC title

• H01G9/204

  comprising zinc oxides, e.g. ZnO (H01G9/2036 takes precedence) · CPC title

• Y02E10/542

  Dye sensitized solar cells · CPC title

• H01G9/2009 Primary

  Solid electrolytes · CPC title

• H01G9/205

  comprising a semiconductor electrode comprising AIII-BV compounds with or without impurities, e.g. doping materials · CPC title