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CN-116249422-B - Perovskite solar cell and preparation method thereof

CN116249422BCN 116249422 BCN116249422 BCN 116249422BCN-116249422-B

Abstract

The invention discloses a perovskite solar cell and a preparation method thereof, wherein the perovskite solar cell is provided with a hole transmission layer, and the hole transmission layer is made of an organic molecular material which takes dimethyl sulfide-diphenylamine or triphenylamine as a terminal group and takes alkoxy or thienyl substituted benzodithiophene as a central unit. The invention provides an organic micromolecular material without additives and surface treatment process for replacing PTAA, which improves the photoelectric conversion efficiency and the stability of a corresponding device.

Inventors

  • ZHANG JING
  • CHEN ZIYIN
  • ZHOU CHUANYU
  • YUAN NINGYI
  • DING JIANNING

Assignees

  • 常州大学

Dates

Publication Date
20260505
Application Date
20221122

Claims (8)

  1. 1. The perovskite solar cell is characterized by comprising a hole transport layer, wherein the hole transport layer is made of an organic molecular material with dimethyl sulfide-diphenylamine or triphenylamine as a terminal group and alkoxy or thienyl substituted benzodithiophene as a central unit; the material of the hole transport layer comprises one of organic molecular materials shown in a formula I or a formula II; (formula I), (Formula II); the perovskite solar cell takes CH 3 NH 3 PbI 3-x Cl x as a perovskite active layer.
  2. 2. The perovskite solar cell according to claim 1, wherein the material of the hole transport layer is an organic molecular material shown in formula I, and the thickness of the hole transport layer is 8-15 nm; The hole transport layer is made of an organic molecular material shown in a formula II, and the thickness of the hole transport layer is 5-8 nm.
  3. 3. The perovskite solar cell according to claim 1, wherein the perovskite solar cell further comprises a conductive glass substrate (100), the hole transport layer (200) is positioned on the surface of the conductive glass substrate (100), the perovskite active layer (300) is positioned on the surface of the hole transport layer (200), and the perovskite active layer (300) is further provided with an electron transport layer (400), a barrier layer (500) and an Ag electrode (600) in sequence.
  4. 4.A method for producing a perovskite solar cell according to claim 1, comprising, Providing a material of the hole transport layer; spin-coating a hole transport layer material on the substrate electrode and annealing.
  5. 5. The method for manufacturing a perovskite solar cell according to claim 4, wherein the material of the hole transport layer is spin-coated with an organic molecular material of formula I dissolved in an organic solvent at a concentration of 5-15 mg/mL, or with an organic molecular material of formula II dissolved in an organic solvent at a concentration of 3-10 mg/mL.
  6. 6. The method for preparing a perovskite solar cell according to claim 5, wherein the material of the hole transport layer is spin-coated with an organic molecular material of formula I with a concentration of 10 mg/mL in an organic solvent or with an organic molecular material of formula II with a concentration of 5 mg/mL in an organic solvent.
  7. 7. The method for manufacturing a perovskite solar cell according to any one of claims 4 to 6, wherein the annealing temperature is 100 to 175 ℃ and the annealing time is 5 to 15 min.
  8. 8. The method of manufacturing a perovskite solar cell according to claim 7, wherein the annealing temperature is 150 ℃ and the annealing time is 5 min.

Description

Perovskite solar cell and preparation method thereof Technical Field The invention belongs to the technical field of solar photovoltaic devices, and particularly relates to a perovskite solar cell and a preparation method thereof. Background In recent years, organic-inorganic Perovskite Solar Cells (PSCs) have been rapidly developed, and in about ten years, scientists have conducted intensive research into perovskite solar cells, and currently the cell efficiency of this type has exceeded 25％(H.Min,T.J.Shin,S.Seok et al.Perovskite solar cells with atomically coherent interlayers on SnO2 electrodes,Nature,2021,598,444-450). in PSCs, and Hole Transport Materials (HTM) play a key role in extracting and transporting holes from a perovskite active layer to a counter electrode. Among them, polymer PTAA (poly [ bis (4-benzene) (2, 4, 6-trimethylbenzene) amine) is a standard hole transport material commercialized in p-i-n planar structure PSCs at present, and the highest efficiency of PSCs based on the material can reach 22%, but to obtain high efficiency, it is often necessary to perform surface infiltration treatment on PTAA or add a dopant to improve hole extraction and transport efficiency. The presence of the additive greatly influences the stability of the device, and is unfavorable for the commercialization development of perovskite solar cells. Disclosure of Invention This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application. The present invention has been made in view of the above and/or problems occurring in the prior art. One of the purposes of the invention is to provide a perovskite solar cell, and to provide an organic small molecular material which does not need additives and surface treatment processes to replace PTAA, so that the photoelectric conversion efficiency is improved, and meanwhile, the stability of a corresponding device is improved. In order to solve the technical problems, the invention provides a perovskite solar cell which is provided with a hole transport layer, wherein the hole transport layer is made of an organic molecular material with dimethyl sulfide-diphenylamine or triphenylamine as a terminal group and alkoxy or thienyl substituted benzodithiophene as a central unit. As a preferable scheme of the perovskite solar cell, the material of the hole transport layer comprises one of organic molecular materials shown in a formula I or a formula II; As a preferable scheme of the perovskite solar cell, the material of the hole transport layer is an organic molecular material shown in a formula I, and the thickness of the hole transport layer is 8-15 nm; The hole transport layer is made of an organic molecular material shown in a formula II, and the thickness of the hole transport layer is 5-8 nm. As a preferable scheme of the perovskite solar cell, CH 3NH3PbI3-xClx is used as a perovskite active layer of the perovskite solar cell. As a preferable scheme of the perovskite solar cell, the perovskite solar cell further comprises a conductive glass substrate, the hole transport layer is positioned on the surface of the conductive glass substrate, the perovskite active layer is positioned on the surface of the hole transport layer, and the perovskite active layer is further provided with an electron transport layer, a barrier layer and an Ag electrode in sequence. It is another object of the present invention to provide a method of manufacturing a perovskite solar cell, comprising, Providing a material of the hole transport layer; spin-coating a hole transport layer material on the substrate electrode and annealing. The perovskite solar cell preparation method is characterized in that the material of the hole transport layer is spin-coated, and the material is spin-coated and dissolved in an organic solvent to form an organic molecular material with the concentration of 5-15 mg/mL as shown in the formula I, or spin-coated and dissolved in an organic solvent to form an organic molecular material with the concentration of 3-10 mg/mL as shown in the formula II. As a preferable scheme of the preparation method of the perovskite solar cell, the material of the hole transport layer is spin-coated, and the material is spin-coated with an organic molecular material shown in the formula I with the concentration of 10mg/mL in an organic solvent or with the concentration of 5mg/mL in an organic solvent. The preparation method of the perovskite solar cell is characterized by comprising the following steps of annealing at 100-175 ℃ for 5-15 min. As a preferable scheme of the preparation method of the perovskite solar cell, the annealing treatment is carried out at the annealing temperature of 150 ℃ for 5min. Compared wit