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CN-121985704-A - Perovskite solar cell electron transport layer based on cationic polyelectrolyte additive, and preparation method and application thereof

CN121985704ACN 121985704 ACN121985704 ACN 121985704ACN-121985704-A

Abstract

The invention relates to the technical field of perovskite solar cells, in particular to a perovskite solar cell electron transport layer based on a cationic polyelectrolyte additive, and a preparation method and application thereof. The preparation method comprises the steps of adding a cationic polyelectrolyte additive into PCBM electron transport material solution, stirring to obtain electron transport material solution containing the cationic polyelectrolyte additive, and coating the electron transport material solution containing the cationic polyelectrolyte on a perovskite light absorption layer to prepare the perovskite solar cell electron transport layer based on the cationic polyelectrolyte additive. Wherein the cationic polyelectrolyte additive is one of polyvinyl pyridine, polyvinyl alcohol, polyethyleneimine, polyester amide, polyacrylamide and polyethylene amide. The method can passivate perovskite defects, improve device efficiency, reduce process complexity and manufacturing cost, and provide a new way for preparing large-area solar cells.

Inventors

  • ZHANG AIHUA
  • LIU KEYONG
  • CHEN RU

Assignees

  • 大正(厦门)微纳科技有限公司

Dates

Publication Date
20260505
Application Date
20260204

Claims (10)

  1. 1. The preparation method of the perovskite solar cell electron transport layer based on the cationic polyelectrolyte additive is characterized by comprising the following steps of adding the cationic polyelectrolyte additive into PCBM electron transport material solution, stirring to obtain electron transport material solution containing the cationic polyelectrolyte additive, coating the electron transport material solution containing the cationic polyelectrolyte additive on a perovskite light absorption layer, and preparing the perovskite solar cell electron transport layer based on the cationic polyelectrolyte additive, wherein the cationic polyelectrolyte additive is one of polyvinylpyridine, polyvinyl alcohol, polyethyleneimine, polyesteramide, polyacrylamide and polyethyleneamide.
  2. 2. The method for preparing a perovskite solar cell electron transport layer based on a cationic polyelectrolyte additive according to claim 1, wherein the mass concentration of the PCBM electron transport material solution is 15-25mg/ml.
  3. 3. The method of preparing a perovskite solar cell electron transport layer based on a cationic polyelectrolyte additive according to claim 1, wherein the solvent of the PCBM electron transport material solution is chlorobenzene.
  4. 4. The method of producing a perovskite solar cell electron transport layer based on a cationic polyelectrolyte additive according to claim 1, wherein the concentration of cationic polyelectrolyte additive in the PCBM electron transport material solution is 0.01-0.5wt%.
  5. 5. The method for producing an electron transport layer for perovskite solar cell based on cationic polyelectrolyte additives according to claim 1, wherein the stirring time is 20-40min.
  6. 6. The method for preparing an electron transport layer of a perovskite solar cell based on a cationic polyelectrolyte additive according to claim 1, wherein the coating method is spin coating, knife coating, slot coating or spray coating.
  7. 7. The method for preparing the perovskite solar cell electron transport layer based on the cationic polyelectrolyte additive according to claim 1, wherein the cationic polyelectrolyte additive is added into the electron transport layer in a solution mixing mode.
  8. 8. A perovskite solar cell electron transport layer based on a cationic polyelectrolyte additive, characterized in that the electron transport layer material comprises a fullerene derivative of PCBM, prepared by the preparation method according to any one of claims 1-7.
  9. 9. The perovskite solar cell electron transport layer based on a cationic polyelectrolyte additive according to claim 7, wherein the electron transport layer has a thickness of 20-40nm.
  10. 10. Use of a perovskite solar cell electron transport layer based on a cationic polyelectrolyte additive according to claim 8 or 9 for the preparation of a solar cell.

Description

Perovskite solar cell electron transport layer based on cationic polyelectrolyte additive, and preparation method and application thereof Technical Field The invention relates to the technical field of perovskite solar cells, in particular to a perovskite solar cell electron transport layer based on a cationic polyelectrolyte additive, and a preparation method and application thereof. Technical Field With the technological progress, the demand of human beings for energy is larger and larger, solar energy is renewable, clean and environment-friendly, the perovskite solar cell has the advantages of simple preparation, low-temperature processing and the like, so far, the authentication efficiency of the perovskite solar cell is more than 25%, PCBM (6.6-phenyl-C61-methyl butyrate) has excellent electron mobility, and the perovskite solar cell is an electron transport material which is difficult to replace in the trans (p-i-n) perovskite solar cell with the industrial prospect at present, but has poor solubility, and the preparation of a high-quality fully-covered perovskite film based on PCBM is very difficult. In addition, the traditional PCBM single component has poor film forming quality, and has the problems of uneven state, uneven film thickness, holes and the like in the process of solvent drying. In addition, in the drying process, the traditional single-component PCBM cannot conduct fine adjustment of different material interfaces through the energy level of the PCBM. Disclosure of Invention In order to overcome the defects, the invention provides a perovskite solar cell electron transport layer based on a cationic polyelectrolyte additive, a preparation method and application thereof, which can passivate perovskite defects, improve device efficiency, reduce process complexity and manufacturing cost and provide a new way for preparing large-area solar cells. The invention adopts the following technical scheme to realize the aim: A preparation method of a perovskite solar cell electron transport layer based on a cationic polyelectrolyte additive comprises the following steps of adding the cationic polyelectrolyte additive into PCBM electron transport material solution, stirring to obtain electron transport material solution containing the cationic polyelectrolyte additive, coating the electron transport material solution containing the cationic polyelectrolyte additive on a perovskite light absorption layer, and preparing the perovskite solar cell electron transport layer based on the cationic polyelectrolyte additive, wherein the cationic polyelectrolyte additive is one of polyvinylpyridine, polyvinyl alcohol, polyethyleneimine, polyesteramide, polyacrylamide and polyvinylamide. Further, the mass concentration of the PCBM electron transport material solution is 15-25mg/ml. Further, the solvent of the PCBM electron transport material solution is chlorobenzene. Further, the concentration of the cationic polyelectrolyte additive in the PCBM electron transport material solution is 0.01 to 0.5wt%. Further, the concentration of the cationic polyelectrolyte additive in the PCBM electron transport material solution is 0.05 to 0.15wt%. Further, the stirring time is 20-40min. Further, the coating method is spin coating, blade coating, slot coating or spray coating. Further, the cationic polyelectrolyte additive is added to the electron transport layer by means of solution mixing. The invention also provides a perovskite solar cell electron transport layer based on the cationic polyelectrolyte additive, which is prepared by the preparation method, and the electron transport layer material comprises a fullerene derivative of PCBM. Further, the thickness of the electron transport layer is 20-40nm. In addition, the invention also provides an application of the perovskite solar cell electron transport layer based on the cationic polyelectrolyte additive in preparing a solar cell. Advantageous effects The cationic polyelectrolyte solution becomes a cationic polymer after ionization, so that the processability of the solution and the morphology of the film are improved, PCBM (printed circuit board) can not be influenced, cationic polyelectrolyte molecules can migrate to the top and bottom interfaces in the PCBM film coating and drying process, the polyelectrolyte at the bottom generates an in-situ protonation process at the perovskite interface, the deep traps of carriers are remarkably reduced, and the polyelectrolyte thin layer at the top can improve the potential barrier between the PCBM electron transport layer and the top electrode layer. The molecular orbital energy level of the polyelectrolyte material can be matched with that of PCBM, and the energy level of PCBM is slightly reduced through energy level hybridization, so that the open-circuit voltage of the device is increased, and the electron transmission efficiency is not sacrificed. Due to the characteristics, perovskite defects can be passivated, the device