CN-121985706-A - Perovskite solar cell based on air knife assistance and mixed solvent, and preparation method and application thereof

Abstract

The invention discloses a perovskite solar cell based on air knife assistance and mixed solvent, and a preparation method and application thereof, and belongs to the technical field of perovskite solar cells. The electron transport layer is prepared by dissolving PCBM in a mixed solvent of anisole and an alcohol cosolvent to obtain PCBM coating liquid, loading the PCBM coating liquid into a coater, starting the coater and a doctor blade system, and simultaneously executing coating operation and doctor blade auxiliary operation to form the electron transport layer, wherein the coating operation is to coat the PCBM coating liquid on a perovskite light absorption layer through a slit coating tool bit in the coater to form a PCBM wet film, and the doctor blade auxiliary operation is to spray air flow with controllable temperature, flow, pressure, action time and angle to the surface of the PCBM wet film through a doctor blade nozzle in the doctor blade system. The invention fundamentally solves the problem of uniform film formation through the cooperation of the mixed solvent and the auxiliary operation of the air knife.

Inventors

• MA CHEN
• YU WANG
• CHANG KAI
• ZHANG KANG
• XU WEIZHE
• ZHENG WEI
• Gan Yuanbing
• YANG PENGCHENG

Assignees

• 大正(江苏)微纳科技有限公司

Dates

Publication Date

20260505

Application Date

20260122

Claims (10)

1. 1. The preparation method of the perovskite solar cell based on the air knife assistance and the mixed solvent is characterized by comprising the following steps of: Sequentially manufacturing a hole transmission layer and a perovskite light absorption layer on a transparent conductive substrate; The method comprises the steps of dissolving PCBM in a mixed solvent of anisole and an alcohol cosolvent to obtain PCBM coating liquid, loading the PCBM coating liquid into a coating machine, starting the coating machine and an air knife system, and simultaneously executing coating operation and air knife auxiliary operation to form an electron transmission layer, wherein the coating operation is to coat the PCBM coating liquid on a perovskite light absorption layer through a slit coating tool bit in the coating machine to form a PCBM wet film, and the air knife auxiliary operation is to spray air flow with controllable temperature, flow, pressure, action time and angle to the surface of the PCBM wet film through an air knife nozzle in the air knife system; And sequentially manufacturing a hole blocking layer and an electrode on the electron transport layer to obtain the perovskite solar cell.
2. 2. The method for manufacturing a perovskite solar cell based on air knife assistance and mixed solvent according to claim 1, wherein the positions of the air knife nozzle and the slit coating cutter head are relatively fixed.
3. 3. The method for manufacturing the perovskite solar cell based on the air knife assistance and the mixed solvent according to claim 2, wherein the air knife nozzle is always arranged behind the slit coating tool bit along the direction perpendicular to the moving direction of the substrate, the distance between the air knife nozzle and the slit coating tool bit is 3-6 cm, and the distance between the air knife nozzle and the perovskite light absorbing layer is 3-5 cm.
4. 4. The method for manufacturing a perovskite solar cell based on air knife assistance and mixed solvent according to claim 1, wherein an angle between the air flow sprayed by the air knife nozzle and the perovskite light absorbing layer is 40-60 degrees.
5. 5. The method for preparing the perovskite solar cell based on the air knife auxiliary and the mixed solvent, which is disclosed in claim 1, is characterized in that the volume ratio of anisole to the alcohol cosolvent is (3-5): 1, and the alcohol cosolvent is one or more of isopropanol, ethanol and methanol.
6. 6. The method for preparing the perovskite solar cell based on the air knife assistance and the mixed solvent according to claim 1, wherein the air flow is clean air or inert gas which is dried and filtered, the temperature of the air flow is 20-30 ℃, and the pressure of the air flow is 0.1-0.3 bar.
7. 7. The method for manufacturing a perovskite solar cell based on an air knife auxiliary and mixed solvent according to claim 1, further comprising the step of heating the PCBM coating liquid to 40-60 ℃ before loading the PCBM coating liquid into a coater.
8. 8. The method for preparing the perovskite solar cell based on the air knife assistance and the mixed solvent according to claim 1, wherein the concentration of the PCBM coating liquid is 10-20 mg/mL.
9. 9. Perovskite solar cell based on air knife assistance and mixed solvents, characterized in that it is prepared by the preparation method according to any one of claims 1 to 8.
10. 10. An application of perovskite solar cell is characterized in that, use of the perovskite solar cell according to claim 9 in the field of photovoltaic power generation.

Description

Perovskite solar cell based on air knife assistance and mixed solvent, and preparation method and application thereof Technical Field The invention relates to a perovskite solar cell based on air knife assistance and mixed solvent, and a preparation method and application thereof, and belongs to the technical field of perovskite solar cells. Background Perovskite solar cells have become a powerful competitor to the next generation of photovoltaic technology due to their excellent photoelectric conversion efficiency (PCE, photoelectric Conversion Efficiency) and relatively low manufacturing cost. In perovskite solar cells of inverted planar heterojunction (p-i-n) structure, fullerene derivatives, in particular [6,6] -phenyl-C61-butanoic acid methyl ester (PCBM), are widely used as electron transport layers (ETL, electronic Transport Layer), the function of which is to efficiently extract and transport electrons from the perovskite light absorbing layer. However, the PCBM coating prepared by the solution method in the prior art has various problems that the conventional solvent such as chlorobenzene has high toxicity, cannot be produced in a large area, is difficult to dry by pure anisole solvent, has unmatched surface tension and the like, and is difficult to form a uniform and compact film with good interface contact with the underlying perovskite. This can lead to increased interface defects, increased charge recombination, and severely hamper electron transport efficiency, ultimately limiting the improvement in large area device performance. In order to solve the problems of anisole solvent interface and stability, the prior art has been explored in many ways. For example, it has been studied to combine a metal endohedral fullerene (e.g., nd@c82) with a polymer (e.g., PMMA) to form a coupling interface layer in order to simultaneously improve electron extraction efficiency and device stability. In addition, specific benzodithiophene compounds or cyano-containing alkoxy silane organic compounds are adopted as an interface modification layer or a passivation layer in the prior art to improve perovskite crystallization quality or passivate interface defects. While effective, these methods may involve complex material synthesis or multilayer structures, adding to the complexity of the process. Disclosure of Invention The invention aims to provide a perovskite solar cell based on air knife assistance and mixed solvent, and a preparation method and application thereof, and solves the problems that the toxicity of the solvent is high, the wettability of anisole on the surface of perovskite is poor, and the film formation is difficult, and the process complexity is high when an electron transport layer is improved in the prior art. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: in a first aspect, the invention provides a method for preparing a perovskite solar cell based on air knife assistance and mixed solvent, comprising the following steps: Sequentially manufacturing a hole transmission layer and a perovskite light absorption layer on a transparent conductive substrate; The method comprises the steps of dissolving PCBM in a mixed solvent of anisole and an alcohol cosolvent to obtain PCBM coating liquid, loading the PCBM coating liquid into a coating machine, starting the coating machine and an air knife system, and simultaneously executing coating operation and air knife auxiliary operation to form an electron transmission layer, wherein the coating operation is to coat the PCBM coating liquid on a perovskite light absorption layer through a slit coating tool bit in the coating machine to form a PCBM wet film, and the air knife auxiliary operation is to spray air flow with controllable temperature, flow, pressure, action time and angle to the surface of the PCBM wet film through an air knife nozzle in the air knife system; And sequentially manufacturing a hole blocking layer and an electrode on the electron transport layer to obtain the perovskite solar cell. Further, the positions of the air knife nozzle and the slit coating cutter head are relatively fixed. Further, the air knife nozzle is always arranged behind the slit coating tool bit along the direction perpendicular to the moving direction of the substrate, the distance between the air knife nozzle and the slit coating tool bit is 3-6 cm, and the distance between the air knife nozzle and the perovskite light absorbing layer is 3-5 cm. Further, the angle between the airflow sprayed by the air knife nozzle and the perovskite light absorption layer is 40-60 degrees. Further, the volume ratio of anisole to the alcohol cosolvent is (3-5): 1, and the alcohol cosolvent is one or more of isopropanol, ethanol and methanol. Further, the air flow is clean air or inert gas after drying and filtering, the temperature of the air flow is 20-30 ℃, and the pressure of the air flow is 0.1-0.3 bar. Further, be