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CN-122003016-A - Composite hole transport material for flexible perovskite solar cell, and preparation method and application thereof

CN122003016ACN 122003016 ACN122003016 ACN 122003016ACN-122003016-A

Abstract

The invention provides a composite hole transport material for a flexible perovskite solar cell, and a preparation method and application thereof. The composite hole transport material comprises polyacrylamide, lithium chloride and PEDOT: PSS coated cellulose nanofiber. According to the invention, the polyacrylamide, lithium chloride and PEDOT (lithium ion phosphate) PSS coated cellulose nanofiber are compounded, so that the obtained composite hole transport material has the advantages of strong conductivity, strong mechanical strength and the like, and when the composite hole transport material is used in a flexible perovskite solar cell, not only can the bending resistance of the cell be greatly improved, but also the hole extraction and transport performance can be improved, so that the photoelectric performance of the flexible perovskite solar cell is obviously improved.

Inventors

  • LI ZIJIA
  • HE CHENXU
  • WANG WENSONG
  • QIN XIAOYANG
  • Chen Koucheng
  • WANG YONG
  • JIN TONG

Assignees

  • 正泰新能科技股份有限公司

Dates

Publication Date
20260508
Application Date
20260205

Claims (10)

  1. 1. The composite hole transport material for the flexible perovskite solar cell is characterized by comprising polyacrylamide, lithium chloride and PEDOT: PSS coated cellulose nanofibers.
  2. 2. The composite hole transport material according to claim 1, wherein the mass ratio of the lithium chloride is 5% to 25% based on the total mass of the composite hole transport material.
  3. 3. The composite hole transport material according to claim 1 or 2, wherein the mass ratio of the polyacrylamide is 15% to 45% based on the total mass of the composite hole transport material; and/or, in the composite hole transport material, the mass ratio of polyacrylamide to lithium chloride to PEDOT to PSS coated cellulose nanofiber is (0.3-0.6): 0.08-0.5): 1; and/or, in the PEDOT/PSS coated cellulose nanofiber, the mass ratio of the PEDOT/PSS to the cellulose nanofiber is 1 (1.2-1.8); And/or the PEDOT is PSS coated cellulose nanofiber, wherein the diameter of the cellulose nanofiber is 20nm-80nm, and the length of the cellulose nanofiber is 500nm-1500nm.
  4. 4. A method for preparing the composite hole transport material for flexible perovskite solar cells according to any one of claims 1 to 3, wherein the preparation method comprises the steps of: preparing a PEDOT-PSS coated cellulose nanofiber suspension; mixing the PEDOT, PSS coated cellulose nanofiber suspension, an acrylamide monomer and lithium chloride to obtain a dispersion; And mixing the dispersion liquid, the cross-linking agent, the initiator and the catalyst, and performing polymerization reaction to obtain the composite hole transport material.
  5. 5. The method according to claim 4, wherein the preparation step of the suspension of PEDOT: PSS coated cellulose nanofibers comprises: (a) Mixing cellulose nanofiber, 3, 4-ethylenedioxythiophene, sodium polystyrene sulfonate and an oxidant, and performing oxidation treatment to obtain an intermediate solution; (b) And mixing the intermediate solution, an oxidant and an initiator, and reacting to obtain the PEDOT-PSS coated cellulose nanofiber suspension.
  6. 6. The method according to claim 4 or 5, wherein the concentration of the suspension of PEDOT: PSS coated cellulose nanofibers is 0.4wt% to 0.6wt%; And/or the volume mass ratio of PEDOT to PSS coated cellulose nanofiber suspension to acrylamide monomer to lithium chloride is 6mL (2-4) g (0.5-3) g.
  7. 7. The method according to any one of claims 4 to 6, wherein the polymerization temperature is room temperature; and/or the polymerization reaction time is 20min-40min.
  8. 8. The preparation method according to any one of claims 4 to 7, characterized in that the preparation method comprises the steps of: (1) The preparation method of the PEDOT/PSS coated cellulose nanofiber suspension comprises the following steps: (a) Adding 3, 4-ethylenedioxythiophene and sodium polystyrene sulfonate into cellulose nanofiber to obtain a mixed solution, and carrying out oxidation treatment on the mixed solution by adopting an oxidant under the stirring condition to obtain an intermediate solution, wherein the oxidant comprises tetramethyl piperidine oxide; (b) Adding an oxidant and an initiator into the intermediate solution, stirring and mixing, then carrying out a reaction at normal temperature for 16-20 hours, and washing and carrying out ultrasonic treatment after the reaction is finished to obtain a PEDOT (polyether-coated cellulose) nanofiber suspension, wherein the oxidant comprises ferric chloride, the initiator comprises ammonium persulfate, and the concentration of the PEDOT (polyether-coated cellulose) nanofiber suspension is 0.4-0.6 wt%; (2) Adding acrylamide into the PEDOT-PSS coated cellulose nanofiber suspension, and then adding lithium chloride to stir and mix to obtain a dispersion; Wherein the volume mass ratio of PEDOT to PSS coated cellulose nanofiber suspension to acrylamide monomer to lithium chloride is 6mL (2-4) g (0.5-3) g; (3) Adding a cross-linking agent, an initiator and a catalyst into the dispersion liquid under the stirring condition, mixing, and then carrying out a polymerization reaction for 20-40 min at room temperature to obtain a composite hole transport material; wherein the cross-linking agent comprises methylene bisacrylamide, the initiator comprises ammonium persulfate, and the catalyst comprises tetramethyl ethylenediamine.
  9. 9. The flexible perovskite solar cell is characterized by comprising a flexible conductive substrate, a hole transport layer, a perovskite light absorption layer, an electron transport layer and an electrode which are stacked; Wherein the material of the hole transport layer is the composite hole transport material for the flexible perovskite solar cell according to any one of claims 1 to 3.
  10. 10. The flexible perovskite solar cell of claim 9, wherein the material of the flexible conductive substrate comprises any one of polyethylene terephthalate, polyethylene naphthalate, or colorless polyimide; and/or the thickness of the hole transport layer is 30nm-50nm; and/or the perovskite light absorbing layer has a chemical formula of ABX 3 , wherein A comprises any one or a combination of at least two of formamidine ions, methylamine ions, cesium ions or rubidium ions, B comprises any one or a combination of at least two of lead ions, tin ions or germanium ions, and X comprises any one or a combination of at least two of chloride ions, bromide ions or iodide ions; and/or the thickness of the perovskite light absorption layer is 400nm-700nm; And/or the material of the electron transport layer is an n-type semiconductor material, wherein the n-type semiconductor material comprises any one of C 60 、PCBM、TiO 2 、SnO 2 , znO or ZnO-ZnS; and/or the electrode includes any one of an Al electrode, an Au electrode, an Ag electrode, or a carbon electrode.

Description

Composite hole transport material for flexible perovskite solar cell, and preparation method and application thereof Technical Field The invention belongs to the technical field of solar cells, and particularly relates to a composite hole transport material for a flexible perovskite solar cell, and a preparation method and application thereof. Background In recent years, there is an increasing demand for Flexible Perovskite Solar Cells (FPSCs) in the market, mainly due to the characteristics of low-temperature preparation, light weight, flexibility of the perovskite thin film, compatibility with various curved surfaces, and the like. The greatest characteristic of flexible perovskite solar cells is the flexibility and the restorability. Conventional restorability refers to the ability of a material to deform under an external force and to recover from the deformation after the external force is removed. The restorability of an object is related to the properties of the material itself. Thus, to obtain a highly restorative FPSC, there are some requirements on both chemical composition and preparation method. For FPSC, its composition mainly includes a flexible substrate, electrodes, perovskite light absorbing material, and charge transport material. The charge transport material comprises an Electron Transport Material (ETM) and a Hole Transport Material (HTM), and is characterized in that the charge transport material is 1) capable of being prepared at a low temperature, 2) excellent in carrier extraction capacity, 3) good in interface contact, 4) low in carrier transport resistance, 5) suitable in energy level and 6) high in restorability in order to realize a flexible device with high efficiency and stability. In addition, the hole transport material must be selected to meet solution processing requirements. At present, HTM commonly used mainly includes poly (3-hexylthiophene) (P3 HT), poly [ bis (4-phenyl) (2, 4, 6-trimethylphenyl) amine (PTAA), poly (3, 4-ethylenedioxythiophene): poly (styrene sulfonic acid) (PEDOT: PSS), and the like, and inorganic materials such as NiOx, however, these charge transport layer materials tend to have poor flexibility and weak contact with adjacent layer interfaces, so that in the repeated bending process of the flexible perovskite solar cell, the restorability of these charge transport layer materials is rapidly reduced, and further the internal charge extraction and transmission efficiency of the device is reduced, the interface recombination is aggravated, and finally the photoelectric conversion efficiency of the flexible solar cell is remarkably degraded, the working stability is degraded, and the service life is shortened. Therefore, there is a need to design a hole transport material having strong conductivity and strong mechanical strength so that the flexible perovskite solar cell significantly improves its bending resistance while ensuring excellent photoelectric properties. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a composite hole transport material for a flexible perovskite solar cell, and a preparation method and application thereof. According to the invention, the polyacrylamide, lithium chloride and PEDOT (lithium ion phosphate) PSS coated cellulose nanofiber are compounded, so that the obtained composite hole transport material has the advantages of strong conductivity, strong mechanical strength and the like, and when the composite hole transport material is used in a flexible perovskite solar cell, not only can the bending resistance of the cell be greatly improved, but also the hole extraction and transport performance can be improved, so that the photoelectric performance of the flexible perovskite solar cell is obviously improved. In order to achieve the aim of the invention, the invention adopts the following technical scheme: In a first aspect, the invention provides a composite hole transport material for a flexible perovskite solar cell, wherein the composite hole transport material comprises polyacrylamide, lithium chloride and PEDOT: PSS coated cellulose nanofiber. According to the invention, polyacrylamide, lithium chloride and PEDOT: PSS coated cellulose nanofiber are compounded to construct a composite gel state composite hole transport material. The PEDOT/PSS coated cellulose nanofiber plays a dual role of nano enhancement and conductive network construction, wherein the cellulose nanofiber introduces abundant hydrogen bonding sites in microcosmic, the tensile strength and toughness of the material are greatly improved, and the PEDOT/PSS coated surface of the material can form a continuous and efficient charge transmission path in the system to cooperatively improve the hole mobility. In conclusion, the three materials are cooperated, so that the conductivity, the mechanical strength and the environmental stability of the composite hole transport material are greatly improved. The composit