Perovskite solar cell and method of making the same

Patent metadata

Field	Value
Publication number	US-12419190-B2
Application number	US-202117904578-A
Country	US
Kind code	B2
Filing date	Feb 22, 2021
Priority date	Feb 20, 2020
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

A method of forming a photovoltaic device comprising a perovskite photovoltaic cell, particularly a method of forming a perovskite solar cell (PSC), is disclosed having a hole transport layer comprising an additive that may result in one or more of reduced formation of crystalline domains in the hole transport layer; reduced size of pinholes in the hole transport layer; improved dopant homogeneity and increased hydrophobicity of the hole transport layer. Also disclosed are PSCs so formed, showing one or more improved properties.

First claim

The invention claimed is:

1. A method of forming a photovoltaic device, comprising:
providing a substrate;
forming a perovskite photovoltaic cell on the substrate comprising forming a hole transport layer, the hole transport layer comprising a hole transport material selected from the group consisting of a spirobifluorene and a polymeric amine, and the hole transport layer having an additive which is an alkylthiol and/or disulphide that results in one or more of the following:
reduced formation of crystalline domains in the hole transport layer;
reduced size of pinholes in the hole transport layer; and
increased hydrophobicity of the hole transport layer.

2. The method according to claim 1 , wherein the additive prevents the formation of crystalline domains in the hole transport layer, reduces a pinhole size in the hole transport layer, and increases a hydrophobicity of the hole transport layer.

3. The method according to claim 1 , wherein the hole transport layer has a lower HOMO energy level compared to a hole transport layer in absence of the additive.

4. The method according to claim 1 , wherein forming the hole transport layer comprises applying a hole transport layer precursor solution comprising the additive onto the perovskite photovoltaic cell.

5. The method according to claim 1 , wherein the alkylthiol is 1-dodecanethiol.

6. The method according to claim 1 , wherein the disulfide is didodecyl disulphide.

7. The method according to claim 1 , wherein the hole transport layer comprises a dopant.

8. The method according to claim 1 , wherein the hole transport layer comprises 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenyl-amine) 9,9′-spirobifluorene (Spiro-MeOTAD), poly-triarylamine (PTAA), 4-tert-butylpyridine (tBP) and/or a (bis(trifluoromethane)sulfonimidelithium salt (TFSI).

9. A photovoltaic device comprising:
a substrate;
a perovskite photovoltaic cell comprising a hole transport layer, the hole transport layer comprising a hole transport material selected from the group consisting of a spirobifluorene and a polymeric amine, and the hole transport layer having an additive which is an alkylthiol and/or disulphide that that results in one or more of the following:
reduced formation of crystalline domains in the hole transport layer;
reduced size of pinholes in the hole transport layer; and
increased hydrophobicity of the hole transport layer.

10. The device according to claim 9 , wherein the hole transport layer has a lower HOMO energy level compared to the hole transport layer in the absence of the additive.

11. The device according to claim 9 , wherein the spirobifluorene is 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenyl-amine) 9,9′-spirobifluorene (Spiro-MeOTAD).

12. The device according to claim 9 , wherein the hole transport layer comprises 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenyl-amine) 9,9′-spirobifluorene (Spiro-MeOTAD), poly-triarylamine (PTAA), 4-tert-butylpyridine (tBP) and/or a (bis(trifluoromethane)sulfonimidelithium salt (TFSI).

Assignees

• Newsouth Innovations Pty Ltd

Inventors

• Hao Xiaojing
• Liu Xu
• Green Martin Andrew
• Liu Ziheng

Classifications

• H10K30/10

  comprising heterojunctions between organic semiconductors and inorganic semiconductors · CPC title

• H10K30/40

  comprising a p-i-n structure, e.g. having a perovskite absorber between p-type and n-type charge transport layers · CPC title

• H10K30/50

  Photovoltaic [PV] devices · CPC title

• H10K2102/00

  Constructional details relating to the organic devices covered by this subclass · CPC title

• H10K85/633

  comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom · CPC title