All inorganic perovskite materials for short wave IR devices

Patent metadata

Field	Value
Publication number	US-11518688-B2
Application number	US-202017104358-A
Country	US
Kind code	B2
Filing date	Nov 25, 2020
Priority date	Nov 27, 2019
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

All inorganic perovskites for short-wave IR (SWIR) devices having improved chemical stability and long-term stability. Improved methods of making all inorganic perovskites for short-wave IR (SWIR) devices are also disclosed herein.

First claim

What is claimed is:

1. An inorganic perovskite material having a formula of A + B 2+ XY 2 wherein:
A + X is a first metal salt comprising: A + , a first monovalent alkali metal cation, and X, a first monovalent anion; and
B 2+ Y 2 is a second metal salt comprising: B 2+ , a second bivalent alkali earth metal, heavy metal, or transition metal cation, and Y 2 , two second monovalent anions;
wherein the inorganic perovskite material further comprises a stabilizer comprising 1-(3-sulfopropyl) pyridinium hydroxide inner salt, and
wherein a molar ratio of the first metal salt to the second metal salt is about 2:1.

2. The inorganic perovskite material of claim 1 , wherein the first metal salt is cesium iodide.

3. The inorganic perovskite material of claim 1 , wherein the second metal salt is lead (II) iodide.

4. The inorganic perovskite material of claim 1 , wherein the stabilizer is present at a weight ratio of about 0.8% compared to the combined weight of the first metal salt and the second metal salt.

5. The inorganic perovskite material of claim 1 , wherein the first monovalent anion and/or the two second monovalent anions are Br—, Cl—, I—, or combinations thereof.

6. The inorganic perovskite material of claim 1 , further comprising the inorganic perovskite material is a layer on a glass substrate; the glass substrate operative to stabilize the inorganic perovskite material.

7. The inorganic perovskite material of claim 6 , wherein the inorganic perovskite material does not change in maximum wavelength of absorbance from 1000 nm to 2800 nm at ambient temperature for longer than about 8 days.

8. The inorganic perovskite material of claim 1 , wherein the inorganic perovskite material has a highest SWIR absorbance between about 1000-2800 nm.

9. A method of making an inorganic perovskite material having a formula of A + B 2+ XY 2 , comprising:
preparing a precursor solution in a solvent by:
dissolving a first metal salt containing a first monovalent alkali metal cation, A + , and a first monovalent anion, X, in the solvent;
dissolving an second metal salt containing a second bivalent alkali earth metal, heavy metal, or transition metal cation, B 2+ , and two second monovalent anions, Y 2 , in the solvent,
wherein a molar ratio of the first metal salt to the second metal salt is about 2:1 in the solvent;
adding a stabilizer to the precursor solution;
dispersing the precursor solution on a substrate; and
annealing the dispersed precursor solution on the substrate at an annealing temperature from 40-300° C., to form an inorganic perovskite material,

wherein the stabilizer comprises 1-(3-sulfopropyl) pyridinium hydroxide inner salt.

10. The method of claim 9 , wherein annealing is done in a vacuum.

11. The method of claim 9 , wherein the preparing a precursor solution in a solvent is at a temperature from 60-80° C. and wherein dispersing the precursor solution on a substrate is at less than 110° C.

12. The method of claim 9 , wherein the first metal salt is cesium iodide and the second metal salt is lead (II) iodide.

13. The method of claim 12 , wherein the annealing temperature is about 50° C. and wherein the inorganic perovskite material is operative to have a maximum SWIR absorbance at about 1200 nm.

14. The method of claim 12 , wherein the annealing temperature is about 80° C. and wherein the inorganic perovskite material is operative to have a maximum SWIR absorbance at about 1400 nm.

15. The method of claim 12 , wherein the annealing temperature is about 100° C. and wherein the inorganic perovskite material is operative to have a maximum SWIR absorbance at about 1500 nm.

16. The method of claim 9 , further comprising wherein the annealing temperature is operative to determine the wavelength of maximum SWIR absorbance of the inorganic perovskite material.

17. The method of claim 9 , wherein the solvent is dimethylformamide.

18. The method of claim 9 , wherein dispersing the precursor solution on a substrate is done by spin coating the precursor solution on the substrate.

19. The method of claim 9 , wherein the substrate is glass and the glass is operative to stabilize the inorganic perovskite material at ambient temperature.

Assignees

• Honda Motor Co Ltd
• Univ Utah State

Inventors

• Chen Gugang
• Rao Yi
• Li Xia

Classifications

• G02B5/207

  comprising semiconducting materials · CPC title

• C01P2002/34

  perovskite-type (ABO3) · CPC title

• C01P2002/85

  by XPS, EDX or EDAX data · CPC title

• C01P2002/82

  by IR- or Raman-data · CPC title

• C01P2004/03

  obtained by SEM · CPC title