Solar cells comprising 2d-perovskites

Patent metadata

Field	Value
Publication number	US-9564593-B2
Application number	US-201514733462-A
Country	US
Kind code	B2
Filing date	Jun 8, 2015
Priority date	Jun 6, 2014
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

A solar cell includes a light-absorbing layer comprising a 2d-perovskite.

First claim

What is claimed is:

1. A solar cell including:
a first electrode, wherein the first electrode is optically transparent for at least some wavelengths of light;
a second electrode; and
a light-absorbing layer disposed between the first electrode and the second electrode, wherein the light-absorbing layer comprises a mixture of different 2d-perovskites each having inorganic layers and each having the form:
(A) 2 (B) n−1 [M n X 3n+1 ]

where:
A=RNH 3 + , R=organic group
B═R′NH 3 + , R′=organic group
M=metal
X=anion
n denotes the number of M-X sheets in each inorganic layer, and

wherein for each of the 2d-perovskites in the mixture, n is at least 2, and further
wherein the different 2d-perovskites vary in n.

2. The solar cell of claim 1 wherein for at least one of the 2d-perovskites in the mixture, R═C 6 H 5 (CH 2 ) 2 .

3. The solar cell of claim 1 wherein for at least one of the 2d-perovskites in the mixture, R′═CH 3 .

4. The solar cell of claim 1 wherein for at least one of the 2d-perovskites in the mixture, M is selected from the group consisting of Pb, Sn, Ge, Bi, Cu, Au, Ag, and Sb.

5. The solar cell of claim 1 wherein for at least one of the 2d-perovskites in the mixture, X is selected from the group consisting of I, Br, Cl, and F.

6. The solar cell of claim 1 wherein for one of the 2d-perovskites in the mixture, n is greater than or equal to 3.

7. The solar cell of claim 1 wherein for at least one of the 2d-perovskites in the mixture, R═C 6 H 5 (CH 2 ) 2 , R′═CH 3 , M=Pb, and X═I.

8. The solar cell of claim 7 wherein for one of the 2d-perovskites in the mixture, n=3.

9. The solar cell of claim 7 wherein for one of the 2d-perovskites in the mixture, n is greater than or equal to 3.

10. The solar cell of claim 1 further comprising:
an electron-selective contact disposed on the first electrode;
wherein the light-absorbing layer is disposed on the electron-selective contact;
and a hole-selective contact disposed on the light-absorbing layer,
wherein the second electrode is disposed on the hole-selective contact.

11. The solar cell of claim 10 wherein the first electrode comprises fluorine-doped tin oxide (FTO).

12. The solar cell of claim 10 wherein the electron-selective contact comprises titanium dioxide.

13. The solar cell of claim 10 wherein the hole-selective contact comprises spiro-OMeTAD.

14. The solar cell of claim 10 wherein the second electrode comprises gold.

15. The solar cell of claim 1 further comprising:
a hole-selective contact disposed on the first electrode;
wherein the light-absorbing layer is disposed on the hole-selective contact; and
an electron-selective contact disposed on the light-absorbing layer,
wherein the second electrode is disposed on the electron-selective contact.

16. The solar cell of claim 15 wherein the hole-selective contact comprises spiro-OMeTAD.

17. The solar cell of claim 1 wherein the different 2d-perovskites additionally vary in any one or more of the following: R, R′, M, X.

Assignees

• Univ Leland Stanford Junior

Inventors

• Karunadasa Hemamala Indivari
• Smith Ian
• Mcgehee Michael David

Classifications

• Y02E10/549

  Organic PV cells · CPC title

• Y02E10/50

  Photovoltaic [PV] energy · CPC title

• H10K30/50

  Photovoltaic [PV] devices · CPC title

• H10K30/151

  the wide bandgap semiconductor comprising titanium oxide, e.g. TiO2 · CPC title

• H10K85/00

  Organic materials used in the body or electrodes of devices covered by this subclass · CPC title