Layered perovskite, light absorption layer, light-absorption-layer-equipped substrate, photoelectric conversion element, and solar cell

Patent metadata

Field	Value
Publication number	US-2021257167-A1
Application number	US-201817254148-A
Country	US
Kind code	A1
Filing date	Jun 19, 2018
Priority date	Jun 19, 2018
Publication date	Aug 19, 2021
Grant date	—

Abstract

The present invention provides: a layered perovskite that has a high band gap energy and an excellent carrier transport capacity; a light absorption layer containing the layered perovskite; a light-absorption-layer-equipped substrate and a photoelectric conversion element that have the light absorption layer; and a solar cell having the photoelectric conversion element. In the layered perovskite according to present invention, the inter-surface distance of (002) planes calculated from an X-ray diffraction peak obtained by an out-of-plane method is 2.6 to 5.0 nm, and, in the X-ray diffraction peak, an intensity ratio ((111) plane/(002) plane) of an X-ray diffraction peak intensity at a (111) plane with respect to an X-ray diffraction peak intensity at the (002) plane is 0.03 or more.

First claim

1 . A layered perovskite, wherein an inter-surface distance of (002) planes calculated from an X-ray diffraction peak obtained by an out-of-plane method is 2.6 nm or more and 5.0 nm or less, and, in the X-ray diffraction peak, an intensity ratio ((111) plane/(002) plane) of an X-ray diffraction peak intensity at a (111) plane with respect to an X-ray diffraction peak intensity at the (002) plane is 0.03 or more.

2 . The layered perovskite according to claim 1 , containing a compound represented by the following general formula (1):
R 2 MX 1 n X 2 4−n   (1)
wherein R is a monovalent cation, two Rs are identical to each other, M is a divalent metal cation, X 1 and X 2 are each independently a monovalent anion, and n is an average number of moles of X 1 , and n is a real number of 0 or more and 4 or less.

3 . The layered perovskite according to claim 2 , wherein R is an alkylammonium ion having 14 to 30 carbon atoms.

4 . The layered perovskite according to claim 2 , wherein X 1 and X 2 are each independently a fluoride anion, a chloride anion, a bromide anion, or an iodide anion.

5 . The layered perovskite according to claim 2 , wherein M is one or more metal cations selected from the group consisting of Pb 2+ , Sn 2+ , and Ge 2+ .

6 . The layered perovskite according to claim 1 , having a band gap energy of 2.0 eV or more and 3.5 eV or less.

7 . A light absorption layer containing the layered perovskite according to claim 1 .

8 . A light-absorption-layer-equipped substrate, wherein the light absorption layer according to claim 7 is formed on a substrate having a surface free energy of 40 mJ/m 2 or more and 100 mJ/m 2 or less calculated by using the Owens-Wendt equation.

9 . A photoelectric conversion element having the light absorption layer according to claim 7 .

10 . A solar cell having the photoelectric conversion element according to claim 9 .

11 . The layered perovskite according to claim 2 , wherein the compound represented by the general formula (1) is (C 16 H 33 NH 3 ) 2 PbI 4 , (C 16 H 33 NH 3 ) 2 PbI n Br 4−n or (C 18 H 37 NH 3 ) 2 PbI 4 , wherein n is a real number of 0 or more and 4 or less.

12 . The layered perovskite according to claim 2 , having a band gap energy of 2.0 eV or more and 3.5 eV or less.

13 . A light absorption layer containing the layered perovskite according to claim 2 .

14 . The light absorption layer according to claim 7 , wherein a thickness of the light absorption layer is 30 nm or more and 3000 nm or less.

15 . A photoelectric conversion element having the light-absorption-layer-equipped substrate according to claim 8 .

16 . A method for forming the layered perovskite according to claim 2 , wherein a dispersion containing the compound represented by the general formula (1) or a precursor thereof is prepared, and the dispersion is applied to a surface of a substrate and then dried.

17 . A method for forming the layered perovskite according to claim 3 , wherein a dispersion containing the compound represented by the general formula (1) or a precursor thereof is prepared, and the dispersion is applied to a surface of a substrate and then dried.

18 . A method for forming the layered perovskite according to claim 4 , wherein a dispersion containing the compound represented by the general formula (1) or a precursor thereof is prepared, and the dispersion is applied to a surface of a substrate and then dried.

19 . A method for forming the layered perovskite according to claim 5 , wherein a dispersion containing the compound represented by the general formula (1) or a precursor thereof is prepared, and the dispersion is applied to a surface of a substrate and then dried.

20 . The method according to claim 16 , wherein the substrate has a surface free energy of 40 mJ/m 2 or more and 100 mJ/m 2 or less calculated by using the Owens-Wendt equation.

Assignees

• Kao Corp
• Aist

Inventors

• Sawada Takuya
• Sato Haruyuki
• Nakajima Tomohiko
• Tsuchiya Tetsuo

Classifications

• H10K30/15

  Sensitised wide-bandgap semiconductor devices, e.g. dye-sensitised TiO2 (photo-electrochemical devices comprising a liquid electrolyte or a solid electrolyte H01G9/20) · CPC title

• H01G9/2009 Primary

  Solid electrolytes · CPC title

• H10K85/50 Primary

  Organic perovskites; Hybrid organic-inorganic perovskites [HOIP], e.g. CH3NH3PbI3 · CPC title

• Y02E10/542

  Dye sensitized solar cells · CPC title

• H01G9/0036

  Formation of the solid electrolyte layer · CPC title