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CN-121991470-A - Hole transport material, preparation method and application thereof, hole transport layer, solar cell and photovoltaic module

CN121991470ACN 121991470 ACN121991470 ACN 121991470ACN-121991470-A

Abstract

The application relates to the technical field of solar cells, in particular to a hole transport material, a preparation method and application thereof, a hole transport layer, a solar cell and a photovoltaic module. The chemical structural formula of the hole transport material provided by the application comprises an AB formula, wherein the hole transport material contains fluorine element, so that the stability of the hole transport material is improved, the hydrophobicity of the hole transport material is improved, the hole transport material can have good solubility and dispersibility with a nonaqueous solvent, the content of the hole transport material in the nonaqueous solvent can be improved, the degradation caused by the contact of a water-based solvent and a perovskite layer is avoided, the matching property of the interface between the hole transport layer and the perovskite layer can be improved, the morphology between the hole transport layer and the perovskite layer is optimized, and the hole transport material can be suitable for the technical field of nonaqueous processing of devices.

Inventors

  • Lu chenxing

Assignees

  • 天合光能股份有限公司

Dates

Publication Date
20260508
Application Date
20251226

Claims (15)

  1. 1. A hole transport material characterized by a formula of formula comprising formula AB: Wherein Ra and Rb in A comprise at least one of ether group and alkylene group; rc in B comprises at least one of an alkylene group, a perfluoroalkylene group of C 2 ~C 4 ; Re in B comprises at least one of alkylene and perfluoroalkylene of C 2 ~C 4 .
  2. 2. The hole transport material of claim 1, wherein the general chemical structural formula comprises: Wherein the molecular weight ratio of B to A is (0.1-1): 1.
  3. 3. The hole transport material according to claim 1, wherein the hole transport material has a mass ratio of (48-52): (14-17): (30-33): (1-3) of F element, O element, C element and S element using XPS test.
  4. 4. The hole transport material according to claim 1, wherein the hole transport material has a binding energy peak of 1s orbitals of F element at 686 ev-690 ev, a binding energy peak of 1s orbitals of c element at 284 ev-284 ev, a binding energy peak of 2p orbitals of s element at 162 ev-172 ev, and a binding energy peak of 1s orbitals of o element at 528 ev-284 ev, as measured by XPS.
  5. 5. A method for producing the hole transport material according to claim 1, comprising the steps of: Dissolving perfluorosulfonic acid polymer and thiophene compound in solvent, ultrasonic treating, adding oxidant to react to obtain dispersion liquid of polythiophene polymer and perfluorosulfonic acid polymer, and purifying the dispersion liquid to obtain the hole transport material.
  6. 6. The method for producing a hole transporting material according to claim 5, wherein the molar ratio of the perfluorosulfonic acid polymer to the thiophene compound and the oxidizing agent is 1 (1.5-2.5): 1 (3.5-4.5).
  7. 7. The method for producing a hole transporting material according to claim 5, wherein the mass-volume concentration of the hole transporting material in an alcohol solvent is 15mg/mL to 25mg/mL.
  8. 8. The application of the hole transport material is characterized in that the hole transport material is applied to the technical field of perovskite solar cells.
  9. 9. A hole transport layer comprising the hole transport material according to any one of claims 1 to 4 or the hole transport material prepared by the method for preparing a hole transport material according to any one of claims 5 to 7.
  10. 10. A perovskite solar cell, characterized in that it comprises the hole transport layer of claim 9.
  11. 11. The perovskite solar cell of claim 10, wherein the perovskite solar cell comprises a conductive substrate, a hole transport layer, a perovskite absorber layer, an electron transport layer, and a top electrode that are stacked in that order.
  12. 12. A stacked solar cell comprising a top cell comprising the perovskite solar cell of any one of claims 10-11 and a bottom cell selected from at least one of a perovskite solar cell, a crystalline silicon cell, or an organic cell.
  13. 13. The laminated solar cell of claim 12, wherein the crystalline silicon cell is selected from at least one of TOPCon cells, HJT cells, or BC cells.
  14. 14. The solar cell according to any of claims 10-13, wherein the hole transport layer has a thickness of 1-30nm.
  15. 15. A photovoltaic module comprising a solar cell according to any one of claims 10-14.

Description

Hole transport material, preparation method and application thereof, hole transport layer, solar cell and photovoltaic module Technical Field The application relates to the technical field of solar cells, in particular to a hole transport material, a preparation method and application thereof, a hole transport layer, a solar cell and a photovoltaic module. Background In recent years, perovskite solar cells have become research hotspots in the field of global photovoltaics by virtue of excellent light absorption characteristics, high carrier mobility and remarkable cost advantages, and the technical development of the perovskite solar cells has important significance for promoting the high efficiency and low cost of the photovoltaic industry. With the deep research, the photoelectric conversion efficiency of the single junction perovskite solar cell gradually approaches the theoretical limit, the space for further improving the efficiency is limited, and under the background, the wide-range utilization of solar spectrum is realized by overlapping the laminated device architecture (TandemSolarCells, TSCs) formed by the light absorption layers with different band gaps, so that the single junction perovskite solar cell becomes a key technical path for breaking through the bottleneck of single junction efficiency and improving the photoelectric conversion efficiency. In various laminated device structures, a wide band gap perovskite material is commonly adopted in a front cell, a Hole Transport Layer (HTL) and an Intermediate Connection Layer (ICL) are generally deposited in the front cell for connecting a rear cell, and for the hole transport layer, poly [ (3, 4-ethylenedioxy) thiophene ]: polystyrene sulfonate (PEDOT: PSS) is widely used at present as a hole transport material, but poly [ (3, 4-ethylenedioxy) thiophene ]: polystyrene sulfonate has water solubility, and the water-soluble PEDOT: PSS hole transport layer is easy to cause water vapor to permeate into perovskite in the deposition process, and the perovskite material is extremely sensitive to water vapor, and the water vapor is easy to cause stability problems such as perovskite interface degradation, ion migration, phase separation and the like, so that the photoelectric conversion efficiency, stability and service life of the device are seriously affected. Therefore, the hole transport material with controllable dispersibility, high stability and good compatibility with a perovskite system is provided, and the hole transport material is a main technical problem to be solved at present. It should be noted that the foregoing is not necessarily prior art, and is not intended to limit the scope of the present application. Disclosure of Invention The embodiment of the application provides a hole transport material, a preparation method and application thereof, a hole transport layer, a solar cell and a photovoltaic module, which are used for solving or relieving one or more technical problems. In a first aspect, the embodiment of the present application provides a hole transport material, where the general chemical structural formula includes an AB formula: Wherein Ra and Rb in A comprise at least one of ether group and alkylene group; rc in B comprises at least one of an alkylene group, a perfluoroalkylene group of C 2~C4; Re in B comprises at least one of alkylene and perfluoroalkylene of C 2~C4. Optionally, ra and Rb in a include ether groups, rc in B includes a perfluoroalkylene group of C 2, and Re in B includes a perfluoroalkylene group of C 2, and the general structural formula includes: Wherein the molecular weight ratio of B to A is (0.1-1): 1. Optionally, the hole transport material is tested by XPS to obtain the mass ratio of F element, O element, C element and S element as (48-52): (14-17): (30-33): (1-3). Optionally, the hole transport material uses XPS test to obtain that the binding energy peak of the 1s orbit of the F element is located at 686 eV-690eV, the binding energy peak of the 1s orbit of the C element is located at 282 eV-284 eV, the binding energy peak of the 2p orbit of the S element is located at 162eV-172 eV, and the binding energy peak of the 1s orbit of the O element is located at 528 eV-284 eV. The second aspect of the embodiment of the application provides a preparation method of a hole transport material, which comprises the following steps: Dissolving perfluorosulfonic acid polymer and thiophene compound in solvent, ultrasonic treating, adding oxidant to react to obtain dispersion liquid of polythiophene polymer and perfluorosulfonic acid polymer, and purifying the dispersion liquid to obtain the hole transport material. Optionally, the molar ratio of the perfluorinated sulfonic acid polymer to the thiophene compound and the oxidant is (1.5-2.5): 1 (3.5-4.5). Optionally, the mass volume concentration of the hole transport material in the alcohol solvent is 15mg/mL to 25mg/mL. The third aspect of the embodiment of the a