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CN-122028629-A - Construction method of hybrid self-assembled monolayer for improving NiOx interface stability of semitransparent perovskite solar cell

CN122028629ACN 122028629 ACN122028629 ACN 122028629ACN-122028629-A

Abstract

The invention discloses a method for constructing a mixed self-assembled monolayer for improving the stability of a NiOx interface of a semitransparent perovskite solar cell, and belongs to the technical field of perovskite solar cells. The method for constructing the mixed self-assembled monolayer by co-assembling the 1,2, 4-benzene tricarboxylic acid and the [4- (3, 6-dimethyl-9H-carbazole-9-yl) butyl ] phosphoric acid is used for enhancing the stability and wettability of a nickel oxide interface in a perovskite solar cell. The constructed mixed SAM effectively relieves the damage of the traditional polar solvent scouring to the monomolecular layer, reduces the defects of the interface nano holes and the grain boundary, and thus obtains a compact and continuous ultrathin perovskite film. The semitransparent perovskite solar device prepared by the method has lower defect density, better interface coupling and obviously improved photoelectric conversion efficiency and long-term stability.

Inventors

  • LI GUIQIANG
  • WANG LONGXIANG

Assignees

  • 中国科学技术大学

Dates

Publication Date
20260512
Application Date
20260205

Claims (10)

  1. 1. The method for constructing the mixed self-assembled monolayer for improving the NiOx interface stability of the semitransparent perovskite solar cell is characterized by comprising the following steps of: s1, cleaning and drying an ITO conductive glass substrate to obtain clean ITO glass; S2, adding nickel oxide powder into deionized water, performing ultrasonic dispersion for 2-5min, spin-coating the nickel oxide powder on the cleaned ITO glass, and performing annealing treatment after spin-coating to form a uniform NiOx film; s3, adding 1,2, 4-benzene tricarboxylic acid and Me-4PACz into isopropanol, dissolving under magnetic stirring at room temperature, preparing a solution, spin-coating the solution on the surface of the NiOx film, spin-coating for 30-60S, and then annealing to obtain a substrate with a surface covered by the mixed SAM; S4, adding methyl amine chloride, lead iodide, lead bromide, cesium iodide, formamidine hydroiodic acid salt and methyl amine bromide into a solvent to prepare Cs 0.05 (FA 0.95 MA 0.05 ) 0.95 Pb(I 0.95 Br 0.05 ) 3 precursor liquid; S5, spin-coating the precursor liquid on a substrate with a mixed SAM covered on the surface, adopting a two-step spin-coating method, spin-coating at a slow speed for 8-10S, then spin-coating at a fast speed for 30-50S, dripping chlorobenzene for extraction at the last 5-10S of spin-coating, and finally annealing to form a perovskite film with good crystallization; S6, preparing phenethyl ammonium iodide, [6,6] -phenyl-C61-methyl butyrate and 2, 9-dimethyl-4, 7-diphenyl-1, 10-phenanthroline solution, sequentially spin-coating the solution on the surface of the perovskite film for 30 seconds to form an electron transmission layer/passivation layer structure, and finally sequentially evaporating a silver film and a molybdenum trioxide film by adopting thermal evaporation to complete self-assembled monolayer construction, thereby obtaining the semitransparent perovskite film.
  2. 2. The method for constructing a hybrid self-assembled monolayer for improving the NiOx interface stability of a semitransparent perovskite solar cell according to claim 1, wherein the spin-coating in steps S2 and S3 has a spin speed of 3000-5000rpm.
  3. 3. The method for constructing a hybrid self-assembled monolayer for improving the NiOx interface stability of a semitransparent perovskite solar cell according to claim 1, wherein the annealing treatment in step S2 is performed at a temperature of 100-150 ℃ for 15-30min.
  4. 4. The method for constructing a mixed self-assembled monolayer for improving the stability of a NiOx interface of a semitransparent perovskite solar cell according to claim 1, wherein the concentration of 1,2, 4-benzenetricarboxylic acid in the preparation solution in the step S3 is 0.1-0.2mg/mL, and the concentration of Me-4PACz is 0.5-1mg/mL.
  5. 5. The method for constructing a hybrid self-assembled monolayer for improving the NiOx interface stability of a semitransparent perovskite solar cell according to claim 1, wherein the annealing treatment in step S3 is performed at a temperature of 100-120 ℃ for 10-20min.
  6. 6. The method for constructing a mixed self-assembled monolayer for improving the NiOx interface stability of a semitransparent perovskite solar cell according to claim 1, wherein the solvent in the step S4 is a mixed solvent of N, N-dimethylformamide and N-methylpyrrolidone, and the volume ratio of the mixed solvent to the N, N-dimethylformamide to the N-methylpyrrolidone is 7:1.
  7. 7. The method for constructing a hybrid self-assembled monolayer for improving the NiOx interface stability of a semitransparent perovskite solar cell according to claim 1, wherein the concentration of the precursor solution in step S4 is 0.5mol/L.
  8. 8. The method for constructing a hybrid self-assembled monolayer for improving the stability of a NiOx interface of a semitransparent perovskite solar cell according to claim 1, wherein the slow spin coating in step S5 has a rotation speed of 800-1000rpm and the fast spin coating has a rotation speed of 4000-5000rpm.
  9. 9. The method for constructing a hybrid self-assembled monolayer for improving the NiOx interface stability of a semitransparent perovskite solar cell according to claim 1, wherein the annealing treatment in step S5 is performed at a temperature of 100-120 ℃ for 20-40min.
  10. 10. The method for constructing a mixed self-assembled monolayer for improving the NiOx interface stability of a semitransparent perovskite solar cell according to claim 1, wherein the concentration of a phenethyl ammonium iodide solution in the step S6 is 1-5mg/mL, the concentration of an [6,6] -phenyl-C61-butyric acid isopropyl-ester solution is 15-20mg/mL, and the concentration of a2, 9-dimethyl-4, 7-diphenyl-1, 10-phenanthroline solution is 0.5-1mg/mL.

Description

Construction method of hybrid self-assembled monolayer for improving NiOx interface stability of semitransparent perovskite solar cell Technical Field The invention belongs to the technical field of perovskite solar cells, and particularly relates to a method for constructing a hybrid self-assembled monolayer for improving the stability of a NiOx interface of a semitransparent perovskite solar cell. Background Perovskite solar cells have become one of the research hotspots in the photovoltaic field due to their excellent photoelectric conversion efficiency and relatively low manufacturing process cost. The trans (p-i-n) structure device has simple process, low-temperature preparation and good stability, and has wide application prospect in flexible, semitransparent and laminated batteries. Nickel oxide (NiOx), a common inorganic hole transport material, has high optical transmittance, suitable energy band position and excellent chemical stability, and is widely used in trans-perovskite batteries and all-perovskite stacked devices. However, the defect states such as oxygen vacancies and uncomplexed Ni 2+ commonly existing on the NiOx surface are easy to react with perovskite precursors, and interface non-radiative recombination is induced, so that the open circuit voltage of the device is reduced and the long-term stability is reduced. In addition, in order to improve the applicability of the perovskite solar cell in Building Integrated Photovoltaic (BIPV) and other scenes, the semitransparent device needs to have good visible light transmittance while maintaining higher photoelectric conversion efficiency. For this reason, it is generally necessary to thin the perovskite absorption layer to a thickness of 200 nm or less, and to combine a low concentration of the precursor solution to reduce the light absorption loss. However, the ultra-thin perovskite film faces two major core challenges in the deposition process, namely, on one hand, a common self-assembled monolayer material such as Me-4PACz (Me-4 PACz, [4- (3, 6-dimethyl-9H-carbazole-9-yl) butyl ] phosphoric acid) has hydrophobicity, has poor compatibility with high-polarity perovskite precursor solvents (such as DMF (dimethyl formamide) and DMSO (dimethyl formamide), is easy to cause uneven wetting of the solution at an interface, causes local dewetting, rearrangement of a self-assembled layer and even partial shedding, and further causes nano holes, discontinuous crystallization and increase of defect state density at the interface, and on the other hand, a low-concentration precursor has a small solvent amount and a narrow crystallization window in the film forming process, and is easy to cause reduction of perovskite grain size, increase of crystal boundary and decrease of film compactness, thereby reducing carrier transmission efficiency and exacerbating interface recombination. In conclusion, the problems of poor wettability, many defect states, difficult control of the crystallization quality of the ultrathin perovskite film and the like of the NiOx/self-assembled monolayer interface seriously restrict the development of the high-efficiency and high-stability semitransparent perovskite solar cell. There is a need to solve the above-mentioned problems to meet the higher demands in the field of perovskite solar cell technology. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides a method for constructing a hybrid self-assembled monolayer for improving the NiOx interface stability of a semitransparent perovskite solar cell. The aim of the invention can be achieved by the following technical scheme: The method for constructing the mixed self-assembled monolayer for improving the NiOx interface stability of the semitransparent perovskite solar cell comprises the following steps of: s1, sequentially ultrasonically cleaning an ITO conductive glass substrate by using a glass cleaning agent, deionized water, acetone and ethanol, and drying by using nitrogen after cleaning to obtain cleaned ITO glass; s2, adding nickel oxide powder into deionized water, and performing ultrasonic dispersion for 2-5min to obtain uniform NiOx dispersion; spin-coating the NiOx dispersion liquid on the cleaned ITO glass, and performing annealing treatment after spin-coating to form a uniform NiOx film; S3, adding 1,2, 4-benzene tricarboxylic acid (TMLA) and Me-4PACz into isopropanol, dissolving under magnetic stirring at room temperature, preparing a solution, spin-coating the solution on the surface of the NiOx film, spin-coating for 30-60S, and then annealing to obtain a substrate with a surface covered by the mixed SAM; S4, adding methyl amine chloride, lead iodide, lead bromide, cesium iodide, formamidine hydroiodic acid salt and methyl amine bromide into a solvent to prepare Cs 0.05(FA0.95MA0.05)0.95Pb(I0.95Br0.05)3 precursor liquid; S5, spin-coating the precursor liquid on a substrate with a mixed SAM covered on the surface, ado