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CN-122003017-A - Hole transport layer and preparation method and application thereof

CN122003017ACN 122003017 ACN122003017 ACN 122003017ACN-122003017-A

Abstract

The application discloses a hole transport layer and a preparation method and application thereof, and belongs to the technical field of perovskite solar cells. The hole transport layer provided by the application is prepared by covalent bonding of a self-assembled monolayer containing oxygen-containing functional groups and amino and/or carboxyl groups of amino acids. According to the application, the amino acid and the SAM solution are compounded to serve as the hole transport layer, so that the stability of the SAM solution is improved, the transport efficiency of the hole transport layer is enhanced, meanwhile, the surface defects of the perovskite layer are reduced, the charge transfer is promoted, and the efficiency and the stability of the battery are further improved. And the work function of the hole transport layer can be regulated by selecting amino acids with different chain lengths, the valence band energy level of the perovskite layer can be precisely matched, the interface charge composite resistance can be obviously reduced, and the battery performance can be greatly improved.

Inventors

  • GU JUNJIE
  • LUO LONG
  • SHEN YU

Assignees

  • 扬州大学

Dates

Publication Date
20260508
Application Date
20260212

Claims (10)

  1. 1. A hole transport layer, characterized in that the hole transport layer is made by covalent bonding of a self-assembled monolayer comprising oxygen-containing functional groups and amino and/or carboxyl groups of amino acids.
  2. 2. The hole transport layer according to claim 1, wherein the self-assembled monolayer comprises one or more of (2- (9H-carbazol-9-yl) ethyl) phosphonic acid, (2- (3, 6-dimethoxy-9H-carbazol-9-yl) ethyl) phosphonic acid, (2- (3, 6-dimethyl-9H-carbazol-9-yl) ethyl) phosphonic acid, (4- (3, 6-dimethyl-9H-carbazol-9-yl) butyl) phosphonic acid, [4- (3, 6-dimethoxy-9H-carbazol-9-yl) butyl ] phosphonic acid, (4- (3, 6-dimethyl-9H-carbazol-9-yl) butyl) phosphonic acid.
  3. 3. The hole transport layer according to claim 1, wherein the amino acid comprises one or more of L-2-aminoadipic acid, L-alanine, L-2-aminobutyric acid, L-norvaline, and (S) -2-aminocaprylic acid.
  4. 4. The hole transport layer of claim 1, wherein the self-assembled monolayer to amino acid molar ratio is (9-6): 1-4.
  5. 5. A perovskite solar cell comprising a substrate, a hole transport layer according to any one of claims 1 to 4, a perovskite layer, an electron transport layer and an electrode.
  6. 6. The perovskite solar cell of claim 5, wherein the perovskite layer is an organic-inorganic hybrid perovskite having the general formula ABX 3 ; Wherein A is methylamine ion, formamidine ion or cesium ion; B is lead ion or tin ion; x is iodide ion, bromide ion or chloride ion; the electron transport layer comprises one or more of tin oxide, titanium oxide or zinc oxide; The electrode comprises one or more of silver, copper, gold, carbon.
  7. 7. A method of manufacturing a perovskite solar cell as claimed in any one of claims 5 to 6, wherein the method comprises: After depositing the hole transport layer on the substrate; Depositing a perovskite layer on the hole transport layer, and performing passivation treatment; depositing an electron transport layer on the perovskite layer; An electrode is deposited on the electron transport layer.
  8. 8. The method of claim 7, wherein after depositing the hole transport layer on the substrate, comprising: and mixing the self-assembled monolayer solution with an amino acid solution, depositing the obtained mixed solution on the surface of a substrate, and performing annealing treatment to form the hole transport layer.
  9. 9. The method of claim 8, wherein the concentration of the self-assembled monolayer solution is 0.5-1 mg/mL; The concentration of the amino acid solution is 0.5-1 mg/mL.
  10. 10. The method of claim 8, wherein the deposition method comprises one of magnetron sputtering, thermal evaporation, electron beam evaporation, screen printing, knife coating, slot coating, or spray coating.

Description

Hole transport layer and preparation method and application thereof Technical Field The application belongs to the technical field of perovskite solar cells, and particularly relates to a hole transport layer, a preparation method and application thereof. Background Perovskite Solar Cells (PSCs) take organic-inorganic halide perovskite as a light absorption material, have the advantages of low cost, simple preparation process and high photoelectric conversion potential, have good application prospect, and are research hotspots in the current photovoltaic field. The core structure of the cathode structure comprises five parts, namely a substrate, a Hole Transport Layer (HTL), a perovskite layer, an electron transport layer and a metal electrode from bottom to top. The hole transport layer is a key functional layer, and can efficiently extract and separate charges to improve the utilization rate of photo-generated carriers, promote hole transport to reduce charge accumulation and loss, and inhibit charge recombination to reduce interface and bulk loss. The use of self-assembled monolayers (SAMs) as hole transport layers greatly motivates the improvement of PSC performance. The SAM molecules can form a uniform and ordered monolayer on the surface of the electrode through simple solution treatment, so that the work function of the electrode can be effectively regulated and controlled, extraction and transmission of holes can be promoted, the series resistance of the device can be further reduced, and the filling factor and the photoelectric conversion efficiency can be improved. However, SAM agglomerates in solution and the non-tight binding of the phosphate groups to the metal oxide substrate causes problems of non-dense HTL coverage, which ultimately results in a significant decrease in cell performance. Therefore, it is an urgent technical problem in the art to construct a high-quality hole transport layer to improve the power generation efficiency of the battery. Disclosure of Invention The application discloses a hole transport layer, a preparation method and application thereof, and aims to solve the technical problems of large open-circuit voltage loss and low device efficiency of the existing hole transport layer. In order to achieve the above object, the technical scheme of the present application is as follows: in a first aspect the present application provides a hole transport layer made by covalent bonding of a self-assembled monolayer comprising oxygen containing functional groups and amino and/or carboxyl groups of an amino acid. Preferably in combination with the first aspect, the self-assembled monolayer comprises one or more of (2- (9H-carbazol-9-yl) ethyl) phosphonic acid, (2- (3, 6-dimethoxy-9H-carbazol-9-yl) ethyl) phosphonic acid, (2- (3, 6-dimethyl-9H-carbazol-9-yl) ethyl) phosphonic acid, (4- (3, 6-dimethyl-9H-carbazol-9-yl) butyl) phosphonic acid, [4- (3, 6-dimethoxy-9H-carbazol-9-yl) butyl ] phosphonic acid, (4- (3, 6-dimethyl-9H-carbazol-9-yl) butyl) phosphonic acid. Preferably in combination with the first aspect, the amino acid comprises one or more of L-2-aminoadipic acid, L-alanine, L-2-aminobutyric acid, L-norvaline, and (S) -2-aminocaprylic acid. Binding to the first aspect preferably the molar ratio of self-assembled monolayer to amino acid is (9-6): 1-4. A second aspect of the application provides a perovskite solar cell comprising a substrate, a hole transport layer according to the first aspect, a perovskite layer, an electron transport layer and an electrode. With reference to the second aspect, preferably, the perovskite layer is an organic-inorganic hybrid perovskite having a general formula ABX 3; Wherein A is methylamine ion, formamidine ion or cesium ion; B is lead ion or tin ion; x is iodide ion, bromide ion or chloride ion; the electron transport layer comprises one or more of tin oxide, titanium oxide or zinc oxide; The electrode comprises one or more of silver, copper, gold, carbon. A third aspect of the present application provides a method of producing a perovskite solar cell as defined in the second aspect, the method comprising: After depositing the hole transport layer on the substrate; Depositing a perovskite layer on the hole transport layer, and performing passivation treatment; depositing an electron transport layer on the perovskite layer; An electrode is deposited on the electron transport layer. With reference to the third aspect, preferably, after depositing the hole transport layer on the substrate, the method includes: And mixing the self-assembled monolayer solution with an amino acid solution, coating the obtained mixed solution on the surface of a substrate, and performing deposition treatment to form the hole transport layer. Preferably, in combination with the third aspect, the self-assembled monolayer solution has a solution concentration of 0.5-1 mg/mL; The concentration of the amino acid solution is 0.5-1 mg/mL. Preferably with reference to th