Search

CN-122012117-A - Liquid crystal mixture, perovskite solar cell containing liquid crystal mixture and preparation method of perovskite solar cell

CN122012117ACN 122012117 ACN122012117 ACN 122012117ACN-122012117-A

Abstract

The invention discloses a liquid crystal mixture, a perovskite solar cell containing the liquid crystal mixture and a preparation method of the perovskite solar cell, and belongs to the technical field of perovskite materials. The liquid crystal mixture is a mixture of 2, 2-dithiodiethanol diacrylate (2S) and 1, 4-bis- [4- (3-acryloxypropoxy) benzoyloxy ] -2-methylbenzene (RM 257), and is spin-coated on the surface of an SnO 2 electron transport layer as a modification layer in the preparation process of a perovskite solar cell. S ions and C-O, C =O functional groups in the mixture are combined with uncoordinated Pb 2+ through the action of Lewis acid and alkali to passivate Pb-based defects on the surface of the perovskite film, and the self-assembly characteristic of the liquid crystal material can promote the preferred orientation growth of the perovskite film, so that the perovskite film with large grain size and high crystallinity is prepared. The photoelectric conversion efficiency and the operation stability of the perovskite device are obviously improved after the optimization of the liquid crystal mixture, and the photoelectric conversion efficiency reaches 25.89%.

Inventors

  • LIU ZHIKE
  • WANG HONGYAN
  • AN ZHONGWEI
  • CHEN RAN

Assignees

  • 陕西师范大学

Dates

Publication Date
20260512
Application Date
20260120

Claims (10)

  1. 1. A liquid crystal mixture, characterized in that the liquid crystal mixture is a mixture of 2, 2-dithiodiethanol diacrylate and 1, 4-bis- [4- (3-acryloxypropoxy) benzoyloxy ] -2-methylbenzene, and has the structural formula: 。
  2. 2. A liquid crystal mixture according to claim 1, wherein the mixing ratio of 2-dithiodiethanol diacrylate and 1, 4-bis- [4- (3-acryloxypropoxy) benzoyloxy ] -2-methylbenzene is 5:95.
  3. 3. A method for preparing a liquid crystal mixture according to claim 1, which is characterized by comprising the steps of taking bis (2-hydroxyethyl) disulfide, triethylamine and methylene dichloride as raw materials, dropwise adding acryloyl chloride under ice bath for reaction, obtaining 2, 2-dithiodiethanol diacrylate after post-treatment and column chromatography, dissolving the 2, 2-dithiodiethanol diacrylate and 1, 4-bis- [4- (3-acryloxypropoxy) benzoyl oxy ] -2-methylbenzene in methylene dichloride, mixing uniformly and drying to obtain the liquid crystal mixture.
  4. 4. A method for preparing a perovskite solar cell, comprising the steps of: S1, spin-coating SnO 2 colloid aqueous solution on FTO conductive glass to prepare a SnO 2 electron transport layer; S2, dissolving the liquid crystal mixture according to claim 1 in chlorobenzene to prepare a modification layer solution with the concentration of 0.05-0.40 mg/mL, spin-coating the modification layer solution on the SnO 2 electron transport layer, and annealing to form a liquid crystal mixture layer; S3, spin-coating the FA 0.9 Cs 0.1 PbI 3 perovskite precursor solution on the liquid crystal mixture layer, and annealing to obtain an FA 0.9 Cs 0.1 PbI 3 perovskite light absorption layer; S4, preparing Spiro on FA 0.9 Cs 0.1 PbI 3 perovskite light absorption layer An OMeTAD hole transport layer; s5, in Spiro And preparing a metal layer on the OMeTAD hole transport layer to obtain the perovskite solar cell.
  5. 5. The method of claim 4, wherein in S2, the spin-coating speed is 2000-4000 rpm and the spin-coating time is 30S.
  6. 6. The method of claim 4, wherein in S2, the annealing temperature is 100 ℃ and the annealing time is 8-12 min.
  7. 7. The method according to claim 4, wherein in S3, the perovskite precursor solution is a mixed solution of formamidine hydroiodidate, cesium iodide and lead iodide dissolved in DMF and DMSO.
  8. 8. The method of claim 4, wherein the concentration of the perovskite precursor solution in S3 is 1.0M.
  9. 9. The method for manufacturing a perovskite solar cell according to claim 4, wherein in S3, the manufacturing process of the FA 0.9 Cs 0.1 PbI 3 perovskite absorber layer is divided into two stages, wherein in the first stage, the spin-coating rotation speed is 1000-2000 rpm, the spin-coating time is 10S, and in the second stage, the spin-coating rotation speed is 4000-5000 rpm, and the spin-coating time is 30S.
  10. 10. A perovskite solar cell with optimized electron transport layer manufactured by the method according to any one of claims 5 to 9, characterized by comprising conductive glass, electron transport layer, liquid crystal mixture layer, perovskite light absorption layer, hole transport layer and metal electrode stacked in this order from bottom to top.

Description

Liquid crystal mixture, perovskite solar cell containing liquid crystal mixture and preparation method of perovskite solar cell Technical Field The invention belongs to the technical field of perovskite materials and device preparation, and particularly relates to a liquid crystal mixture, a perovskite solar cell containing the mixture and a preparation method of the perovskite solar cell. Background Solar energy is taken as a green energy source, and by virtue of the advantages of large reserve, no pollution, wide distribution and the like, the solar energy becomes a research hot spot for global energy development. For decades, solar cell technology based on photovoltaic effect is continuously improved and widely applied, photovoltaic power generation provides a reliable thought for solving energy crisis and environmental problems in China, is beneficial to achieving the goals of carbon peak reaching and carbon neutralization, and has profound influence on future development of human society. In recent years, perovskite Solar Cells (PSCs) have rapidly developed and have achieved remarkable results. This benefits from the advantages of low cost of raw materials for preparation, simple preparation process, etc. At present, snO 2 is mostly adopted as an Electron Transport Layer (ETL) in the high-performance PSCs, but inherent defects seriously restrict further improvement of device performance. SnO 2 is considered a more potential ETL candidate due to its high electron mobility, wide forbidden band and low temperature processability. However, the oxygen vacancy (V O) defects and Sn dangling bonds prevalent in SnO 2 cause interfacial charge trapping and electron injection barrier elevation, severely limiting V OC and FF elevation in perovskite solar cells. In addition, the synergistic effect of defects such as Pb 2+、I- and the like which are not coordinated at the perovskite buried bottom interface and ETL surface defects further aggravates the recombination of carriers and lattice instability. Therefore, how to synchronously realize defect passivation and energy level optimization of ETL and perovskite layers through interface engineering becomes a key for breaking through the performance of the device. Disclosure of Invention The invention aims to overcome the defects of the prior art, provides a liquid crystal mixture, a perovskite solar cell containing the liquid crystal mixture and a preparation method thereof, and aims to solve the problem that the existing perovskite solar cell is low in photoelectric conversion efficiency due to the fact that a large number of defects exist at an interface between an electron transmission layer and a perovskite light absorption layer. In order to achieve the purpose, the invention is realized by adopting the following technical scheme: A liquid crystal mixture of 2, 2-dithiodiethanol diacrylate and 1, 4-bis- [4- (3-acryloxypropoxy) benzoyloxy ] -2-methylbenzene, having the structural formula: 。 the invention further improves that: preferably, the mixing mass ratio of the 2-dithiodiethanol diacrylate and the 1, 4-bis- [4- (3-acryloxypropoxy) benzoyl oxy ] -2-methylbenzene is 5:95. The preparation method of the liquid crystal mixture comprises the following steps of taking bis (2-hydroxyethyl) disulfide, triethylamine and dichloromethane as raw materials, dropwise adding acryloyl chloride under ice bath for reaction, obtaining 2, 2-dithiodiethanol diacrylate after post-treatment and column chromatography, dissolving the 2, 2-dithiodiethanol diacrylate and 1, 4-bis- [4- (3-acryloxypropoxy) benzoyloxy ] -2-methylbenzene in dichloromethane, uniformly mixing and drying to obtain the liquid crystal mixture. A method of preparing a perovskite solar cell comprising the steps of: S1, spin-coating SnO 2 colloid aqueous solution on FTO conductive glass to prepare a SnO 2 electron transport layer; S2, dissolving the liquid crystal mixture according to claim 1 in chlorobenzene to prepare a modification layer solution with the concentration of 0.05-0.40 mg/mL, spin-coating the modification layer solution on the SnO 2 electron transport layer, and annealing to form a liquid crystal mixture layer; S3, spin-coating the FA 0.9Cs0.1PbI3 perovskite precursor solution on the liquid crystal mixture layer, and annealing to obtain an FA 0.9Cs0.1PbI3 perovskite light absorption layer; S4, preparing Spiro on FA 0.9Cs0.1PbI3 perovskite light absorption layer An OMeTAD hole transport layer; s5, in Spiro And preparing a metal layer on the OMeTAD hole transport layer to obtain the perovskite solar cell. Preferably, in S2, the spin-coating rotation speed is 2000-4000 rpm, and the spin-coating time is 30S. Preferably, in S2, the annealing temperature is 100 ℃ and the annealing time is 8-12 min. Preferably, in S3, the perovskite precursor solution is a mixed solution formed by dissolving formamidine hydroiodide, cesium iodide and lead iodide in DMF and DMSO. Preferably, in S3, the concentration of the