Search

CN-121985703-A - Preparation method of passivation layer and perovskite solar cell

CN121985703ACN 121985703 ACN121985703 ACN 121985703ACN-121985703-A

Abstract

The invention relates to a preparation method of a passivation layer and a perovskite solar cell. The preparation method of the passivation layer comprises the following steps of coating a passivation material precursor solution on a perovskite light absorption layer, and forming the passivation layer through annealing treatment, wherein the passivation material precursor solution comprises a passivation material solute and a ternary combination solvent, the ternary combination solvent comprises a main solvent, a diluent and a passivation accelerator, the main solvent is used for dissolving the passivation material solute, the diluent is mutually soluble with the main solvent and does not dissolve the passivation material solute and the perovskite light absorption layer, and the passivation accelerator is an aprotic polar solvent containing a P=O group and is mutually soluble with the main solvent. The preparation method of the passivation layer and the perovskite solar cell obtained by using the preparation method of the passivation layer can further improve the reproducibility and stability of the perovskite solar cell while improving the photoelectric conversion efficiency of the perovskite solar cell.

Inventors

  • ZHANG CHAOQUN
  • XU LAIDI
  • XU YUSHUAI

Assignees

  • 晶澳（扬州）太阳能科技有限公司

Dates

Publication Date
20260505
Application Date
20260121

Claims (10)

  1. 1. A method of preparing a passivation layer for passivating a perovskite light absorbing layer in a perovskite solar cell, the method comprising the steps of: coating a passivation material precursor solution on the perovskite light absorption layer, and forming the passivation layer through annealing treatment; the passivation material precursor solution comprises a passivation material solute and a ternary combination solvent, wherein the ternary combination solvent comprises a main solvent, a diluent and a passivation accelerator; the primary solvent is used for dissolving the passivation material solute; The diluent is mutually soluble with the main solvent and does not dissolve the passivating material solute and the perovskite light absorbing layer; the passivation promoter is an aprotic polar solvent containing a p=o group and is miscible with the main solvent.
  2. 2. The method of manufacturing a passivation layer according to claim 1, The volume ratio of the main solvent to the diluent is 1:9 to 1:1.
  3. 3. The method of manufacturing a passivation layer according to claim 1, The volume percentage of the passivation accelerator in the ternary combination solvent is 0.01% -0.1%.
  4. 4. The method of manufacturing a passivation layer according to claim 1, The main solvent is isopropanol or chloroform.
  5. 5. The method of manufacturing a passivation layer according to claim 1, The diluent is at least one of anisole, chlorobenzene and ethyl acetate.
  6. 6. The method of manufacturing a passivation layer according to claim 1, The passivation accelerator is hexamethylphosphoric triamide.
  7. 7. The method of manufacturing a passivation layer according to claim 1, The volume ratio of the main solvent to the diluent is 1:9-1:1, and the volume percentage of the passivation promoter in the ternary combination solvent is 0.01% -0.1%; And/or the number of the groups of groups, The main solvent is isopropanol or chloroform, the diluent is at least one of anisole, chlorobenzene and ethyl acetate, and the passivation promoter is hexamethylphosphoric triamide.
  8. 8. The method for preparing a passivation layer according to claim 1 to 7, The solute of the passivation material is at least one of propylenediamine iodine, phenethyl iodized amine and 4-methoxyphenylethylamine iodized amine.
  9. 9. The method for preparing a passivation layer according to claim 1 to 7, The temperature of the annealing treatment is 100 ℃ to 120 ℃, and the time of the annealing treatment is 5min to 15 min.
  10. 10. A perovskite solar cell comprises a substrate, a first carrier transmission layer, a perovskite light absorption layer, a passivation layer, a second carrier transmission layer and a metal electrode which are sequentially stacked, The passivation layer is prepared by adopting the preparation method of the passivation layer in any one of claims 1 to 9.

Description

Preparation method of passivation layer and perovskite solar cell Technical Field The disclosure belongs to the field of perovskite solar cells, and particularly relates to a preparation method of a passivation layer and a perovskite solar cell. Background Perovskite Solar Cells (PSC) are considered as the most promising new generation photovoltaic technology due to their significant advantages of simple fabrication, high Photoelectric Conversion Efficiency (PCE), etc. Over the last decade, various strategies have been proposed to improve the photoelectric conversion efficiency of PSCs, such as bulk doping, energy level adjustment, charge transport, etc. Surface passivation is considered to be the most effective method of improving Photoelectric Conversion Efficiency (PCE) due to the large number of defects in the surface of the perovskite light absorbing layer. Wherein, the solvent of the passivation material has a remarkable influence on the passivation effect, the selective dissolution of perovskite components is necessary by finely controlling the solvent components and the proportion, and the potential of surface passivation can be improved to the greatest extent. Since isopropyl alcohol (IPA) is excellent in dissolving a passivation material, it is widely used for surface passivation of various functional layers of perovskite solar cells. However, since formamidine iodide (FAI), which is a conventional material for forming a perovskite light absorbing layer, is soluble in isopropyl alcohol (IPA), when a perovskite light absorbing layer, particularly a thin film based on formamidine iodide, is passivated using a passivation material dissolved in isopropyl alcohol (IPA), additional defects may be caused on the surface of the passivation light absorbing layer, resulting in problems of poor reproducibility, unstable device, etc. of the perovskite solar cell. In addition, other solvents such as chloroform, which are currently used to dissolve passivation materials, in addition to isopropyl alcohol, are aggressive to the perovskite light absorbing layer surface and may dissolve the shallow organic cations (e.g., M) The halogen vacancy defect is increased. Thus, there is still a relatively large room for improvement in passivation of perovskite light absorbing layers at present. Disclosure of Invention In order to solve the above technical problems of the passivation of the perovskite light absorbing layer of the existing perovskite solar cell, the present disclosure provides a method for passivating the surface of the perovskite light absorbing layer by using a passivation material dissolved by a ternary combination solvent (i.e., a preparation method of the passivation layer for the surface of the perovskite light absorbing layer) and the perovskite solar cell comprising the passivation layer, which can further improve the reproducibility and stability of the perovskite solar cell while improving the photoelectric conversion efficiency of the perovskite solar cell. The first aspect of the disclosure provides a preparation method of a passivation layer, wherein the passivation layer is used for passivating a perovskite light-absorbing layer in a perovskite solar cell, the method comprises the following steps of coating a passivation material precursor solution on the perovskite light-absorbing layer, and forming the passivation layer through annealing treatment, wherein the passivation material precursor solution comprises a passivation material solute and a ternary combination solvent, the ternary combination solvent comprises a main solvent, a diluent and a passivation promoter, the main solvent is used for dissolving the passivation material solute, the diluent is mutually soluble with the main solvent and does not dissolve the passivation material solute and the perovskite light-absorbing layer, and the passivation promoter is an aprotic polar solvent containing a P=O group and is mutually soluble with the main solvent. According to the preparation method of the passivation layer, an aprotic polar solvent containing a p=o group is introduced as a passivation accelerator for the passivation material precursor solution. The aprotic polar solvent can soften the inorganic framework of the perovskite light absorption layer, destroy the hydrogen bond of the inorganic framework, and lead the perovskite light absorption layer to have some uncoordinated Pb 2+, on one hand, the uncoordinated Pb 2+ cannot cause structural collapse of the perovskite light absorption layer, and on the other hand, the uncoordinated Pb 2+ and the P=O group with stronger coordination capacity form a coordination bond with more stable structure so as to better passivate the deep energy level defect of the perovskite light absorption layer. the inorganic skeleton principle that aprotic polar solvents can soften the perovskite light absorbing layer is mainly that organic cations in the perovskite light absorbing layer form hydrogen bo