Highly tunable colloidal perovskite nanoplatelets

Patent metadata

Field	Value
Publication number	US-10273405-B2
Application number	US-201715585912-A
Country	US
Kind code	B2
Filing date	May 3, 2017
Priority date	May 4, 2016
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

Colloidal perovskite nanoplatelets can provide a material platform, with tunability extending from the deep UV, across the visible, into the near-IR. The high degree of spectral tunability can be achieved through variation of the cation, metal, and halide composition as well as nanoplatelet thickness.

First claim

What is claimed is:

1. A composition comprising:
one or more of a colloidal nanoplatelet of the formula (I):
L 2 [ABX 3 ] n-1 BX 4   (I)

wherein L is an organic ligand or combination thereof, A is a monovalent metal or organic molecular cation, B is a divalent metal cation, X includes a halide or combinations thereof, and n−1 is the number of unit cells in thickness, wherein n is 1, 2, 3 or 4, wherein L is a mixture of two different organic ligands or X is a mixture of two different halide ions when A is methylammonium and B is Pb.

2. The composition of claim 1 , wherein the organic ligand includes octylammonium (OA) or butylammonium (BA).

3. The composition of claim 1 , wherein the monovalent metal or organic molecular cation includes cesium (Cs), methylammonium (MA) or formamidinium (FA).

4. The composition of claim 1 , wherein the divalent metal cation is lead (Pb) or tin (Sn).

5. The composition of claim 1 , wherein the halide anion is chloride (Cl), bromide (Br), iodide (I), or combinations thereof.

6. The composition of claim 1 , wherein the n is 1 or 2.

7. The composition of claim 1 , wherein a peak absorption wavelength of the composition is between near-IR and UV.

8. A light-emitting diode comprising the composition of claim 1 .

9. A solar cell comprising the composition of claim 1 .

10. A method of modulating an absorption and emission spectrum of a composition comprising:
selecting a peak absorption wavelength between near-IR and UV;
synthesizing a mixture of one or more colloidal nanoplatelets of the formula (I):
L 2 [ABX 3 ] n-1 BX 4   (I)

wherein L is an organic ligand or combinations thereof, A is a monovalent metal or organic molecular cation, B is a divalent metal cation, X is a halide anion, and n−1 is the number of unit cells in thickness, wherein n is 1, 2, 3 or 4 and wherein the halide anion is chloride (Cl), bromide (Br), iodide (I), or combinations thereof, wherein L is a mixture of two different organic ligands or X is a mixture of two different halide ions when A is methylammonium and B is Pb; and
wherein the mixture has the selected peak absorption wavelength.

11. The method of claim 10 , wherein the organic ligand includes octylammonium (OA) or butylammonium (BA).

12. The method of claim 10 , wherein the monovalent metal or organic molecular cation includes cesium (Cs), methylammonium (MA) or formamidinium (FA).

13. The method of claim 10 , wherein the divalent metal cation is lead (Pb) or tin (Sn).

14. The method of claim 10 , wherein then is 1 or 2.

Assignees

• Massachusetts Inst Technology

Inventors

• Weidman Mark Clayton
• Seitz Michael
• Tisdale William Alfred

Classifications

• C04B2235/5454

  nanometer sized, i.e. below 100 nm · CPC title

• C04B2235/768

  Perovskite structure ABO3 · CPC title

• C04B2235/5292

  Flakes, platelets or plates · CPC title

• H01L51/0077

  Electricity · mapped topic

• C09K2211/181

  of the alkali metals and alkaline earth metals · CPC title