Search

CN-122028590-A - Solar cell, preparation method thereof, cell assembly and power utilization device

CN122028590ACN 122028590 ACN122028590 ACN 122028590ACN-122028590-A

Abstract

The application discloses a solar cell, a preparation method thereof, a cell assembly and an electric device. The solar cell comprises a hole transport layer and a perovskite active layer, wherein the hole transport layer is arranged on one side of the perovskite active layer, an organic hole transport material is embedded in the perovskite active layer, and the organic hole transport material is in a three-dimensional network structure and is in contact with the hole transport layer. The solar cell has the advantages that the organic hole transport material with a three-dimensional network structure is embedded in the perovskite active layer, so that the hole transport distance is greatly shortened, the hole extraction driving force and speed are enhanced, the matching degree of holes and electrons on the extraction rate is remarkably improved, the organic hole transport material and the chemical bonding of the organic hole transport material and the transport layer are reduced, and the loss of cross-interface transport is reduced. The battery assembly and the electricity utilization device include solar cells.

Inventors

  • Yi Zongjin
  • CAO QIN
  • LI WENQIANG
  • LIU ZHOU

Assignees

  • 天合光能股份有限公司

Dates

Publication Date
20260512
Application Date
20260120

Claims (14)

  1. 1. The solar cell comprises a hole transport layer and a perovskite active layer, and is characterized in that the hole transport layer is arranged on one side of the perovskite active layer, an organic hole transport material is embedded in the perovskite active layer, and the organic hole transport material is of a three-dimensional network structure and is in contact with the hole transport layer.
  2. 2. The solar cell of claim 1 wherein the organic hole transport material comprises a three-dimensional network polymer.
  3. 3. The solar cell according to claim 2, wherein the three-dimensional network polymer comprises self-assembled monolayer molecular units.
  4. 4. The solar cell according to claim 3, wherein the self-assembled monolayer molecular units comprise at least one of phosphonic acid-based self-assembled monolayer molecular units and carboxylic acid-based self-assembled monolayer molecular units.
  5. 5. The solar cell according to claim 4, wherein the phosphonic acid based self-assembled monolayer molecular units comprise at least one molecular unit of 3- (4- (allyloxy) -9H-carbazol-9-yl) propylphosphonic acid, 4- (5, 9-diallyl-7H-dibenzo [ c, g ] carbazol-7-yl) butylphosphonic acid; And/or the carboxylic acid self-assembled monolayer unit comprises a 4- (2, 7-bis (3-fluoro-4-vinylphenyl) -9H-carbazol-9-yl) benzoic acid molecular unit.
  6. 6. The solar cell according to claim 1 to 5, wherein the perovskite active layer has a thickness of 300 nm to 2000 nm.
  7. 7. The solar cell according to any one of claims 1 to 5, wherein the hole transport layer comprises a self-assembled monolayer in contact with the perovskite active layer and in contact with the three-dimensional network structure.
  8. 8. The solar cell of claim 7, wherein the self-assembled monolayer comprises cross-linkable or polymerized self-assembled monolayer molecules, wherein the self-assembled monolayer molecules in contact with the three-dimensional network structure are chemically bonded to the three-dimensional network structure; and/or the thickness of the hole transport layer is 0.5 nm-5 nm.
  9. 9. The solar cell according to any one of claims 1 to 5 and 8, wherein the solar cell is a single junction perovskite solar cell or a stacked solar cell including perovskite solar cells.
  10. 10. The method for manufacturing a solar cell according to any one of claims 1 to 9, comprising the steps of: providing a substrate, wherein a hole transport layer is arranged on one side surface of the substrate; Forming a perovskite precursor and a precursor solution containing a crosslinkable hole transport material monomer on the surface of the hole transport layer, which is far away from the substrate, and then annealing the solution to form a perovskite active layer; And in the film forming process and/or the annealing process, the crosslinkable hole transport material monomer is induced to undergo a crosslinking reaction, so that the organic hole transport material with a three-dimensional network structure is formed in the perovskite active layer.
  11. 11. The method according to claim 10, wherein the molar concentration of the crosslinkable hole-transporting material monomer in the precursor solution is 0.1 to 5 mmol/L; and/or in the precursor solution, the molar concentration ratio of the crosslinkable hole-transport material monomer to the perovskite precursor is (0.01-1) 200; And/or the crosslinkable hole-transporting material monomer comprises a self-assembled monolayer material.
  12. 12. The method according to claim 10 or 11, wherein the hole transport layer comprises a self-assembled monolayer, and the precursor solution is subjected to the film formation treatment on the surface of the self-assembled monolayer.
  13. 13. A battery assembly comprising a solar cell according to any one of claims 1 to 9 or a solar cell prepared according to the preparation method of any one of claims 10 to 12.
  14. 14. An electrical device comprising the solar cell of any one of claims 1 to 9 or the solar cell produced by the production method of any one of claims 10 to 12 or the cell assembly of claim 13.

Description

Solar cell, preparation method thereof, cell assembly and power utilization device Technical Field The application belongs to the technical field of solar cells, and particularly relates to a solar cell, a preparation method thereof, a cell assembly and an electric device. Background The limit of the photoelectric conversion efficiency of the Perovskite Solar Cell (PSCs) depends not only on the intrinsic properties of the light-absorbing layer itself, but more critically on whether the photogenerated electrons and holes can be extracted efficiently and in balance at the interface and transported to the corresponding electrode. Any one party of extraction delay or obstruction will cause charge accumulation at the interface or bulk phase, causing serious non-radiative recombination loss, thus directly representing the reduction of the device filling factor and open-circuit voltage, and finally limiting the efficiency improvement. In recent years, with the maturation and application of high-performance electron transport materials such as fullerenes and derivatives thereof (e.g., C 60), the electron extraction and transport efficiency in perovskite solar cells such as trans-structured perovskite cells has been significantly enhanced. In contrast, hole Transport Layer (HTL) hole extraction capability is generally behind advanced electron transport materials, resulting in significant imbalance in carrier extraction kinetics. This "fast electron and slow hole" situation has become a core bottleneck that limits device performance, especially preventing the fill factor from approaching the theoretical limit. In order to improve the hole transport material, the prior art mainly uses chemical modification of the hole transport material. Taking SAMs as an example, in order to improve the hole extraction performance of SAMs, the prior art mainly uses chemical modification and functional group modification to SAMs molecules to increase the molecular dipole moment thereof, so as to enhance interface energy level matching and hole extraction power. However, the above strategies relying on increasing the dipole moment of molecules still have significant limitations, such as the random and non-uniform arrangement of molecules on the substrate surface of SAMs, which are not all ordered in the desired dipole direction, resulting in a substantially effective interface dipole action that is impaired and the dipole enhancement effect is greatly compromised. In addition, SAMs itself is a small molecule material that is poorly conductive and also limits the longitudinal transport efficiency of holes. Therefore, the existing chemical modification only at the molecular level is difficult to completely solve the problem of unbalanced carrier extraction, and especially in a device pursuing higher efficiency and thicker perovskite active layer, the recombination loss of holes at the bulk phase and interface is still significant. Disclosure of Invention In view of the above problems, the present application provides a solar cell, a method for manufacturing the same, a cell assembly and an electric device, so as to solve the technical problem that the device Fill Factor (FF) and the open circuit voltage (V OC) of the existing solar cell are difficult to be further improved due to the fact that the hole extraction capability is lower than the electron extraction capability. In a first aspect, embodiments of the present application provide a solar cell. The solar cell comprises a hole transport layer and a perovskite active layer, wherein the hole transport layer is arranged on one side of the perovskite active layer, an organic hole transport material is embedded in the perovskite active layer, and the organic hole transport material is in a three-dimensional network structure and is in contact with the hole transport layer. According to the solar cell provided by the embodiment of the application, the organic hole transport material with a three-dimensional network structure is embedded in the perovskite active layer, a three-dimensional bulk contact interface is formed between the three-dimensional network and perovskite, so that photo-generated electron-hole pairs can be directly captured and efficiently extracted by the organic hole transport material near the generation position, the hole collection capacity of the perovskite active layer in the thickness direction is obviously enhanced, and a stable bulk transport path is established. Meanwhile, the three-dimensional network structure is contacted with the hole transport layer, so that the interface transport loss is greatly reduced, smooth collection and rapid derivation of holes from the active layer to the hole transport layer are realized, and charge accumulation and energy loss caused by energy barrier mismatch or poor contact of the traditional interface are effectively inhibited. Therefore, the three-dimensional network-shaped organic hole transport material embedded in the p