Multi-flow drying air knife and method used for preparing perovskite thin film in perovskite solar cell by using same

A solar cell and perovskite technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve problems such as low substrate coverage, ineffective control of film uniformity and crystallinity, and difficulty in achieving good control of film crystallization. Achieve the effect of accelerating solvent evaporation

Active Publication Date: 2016-12-21
杨冠军
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  • Abstract
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AI Technical Summary

Problems solved by technology

Although the one-step method is relatively simple to operate, there are some problems in the prepared film: the uniformity and crystallinity of the film cannot be effectively controlled, and the grains of the perovskite film are coarse and dendritic, and the coverage of the substrate is low, resulting in electrons being transported It is extremely easy to recombine with holes during the process, resulting in poor battery performance and insufficient stability
The existing technical solutions are mainly through the natural drying of the solvent in the solution, and it is difficult to achieve good control of the crystallization characteristics of the film, so it is impossible to obtain a uniform and dense perovskite film in one step.
It has been reported that speeding up the evaporation by air blowing can increase the drying speed of the solution to a certain extent, but the air blowing can easily cause the instability of the solution surface and cause uneven surface fluctuations of the film, which will affect the uniformity and photoelectric performance of the battery, making it difficult for industrial application.

Method used

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  • Multi-flow drying air knife and method used for preparing perovskite thin film in perovskite solar cell by using same
  • Multi-flow drying air knife and method used for preparing perovskite thin film in perovskite solar cell by using same
  • Multi-flow drying air knife and method used for preparing perovskite thin film in perovskite solar cell by using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1) Using DMF as a solvent, configure CH with a mass percent concentration of 35%. 3 NH 3 PB 3 Solution, spray a layer of prepared perovskite solution on the glass conductive substrate ITO by spraying method to obtain a layer of light yellow liquid film with a thickness of about 2000nm.

[0047] 2) Place the liquid film under a multi-flow dry air knife with a total blowing channel and a total suction channel at 1.0 mm intervals. The total blowing channel is divided into three branches, and the total suction channel is divided into three branches. , each blowing channel is arranged alternately with the suction channel, the total blowing channel blows at a flow rate of 100LPM (0.1MPa), the airflow temperature is 20°C, the total suction channel sucks at 450LPM, and the dry liquid film area is 50mm ×50mm, the air knife moves at a speed of 15mm / s, within 1.7s, the liquid film is completely dried, and a layer of brown film is obtained.

[0048] 3. Heat the dried film on a h...

Embodiment 2

[0050] 1) Using DMSO as a solvent, configure CH with a mass percentage concentration of 30% 3 NH 3 PB 3 Solution, scrape a layer of prepared perovskite solution on the conductive glass FTO substrate, the liquid film is light yellow and the thickness is about 2000nm.

[0051] 2) Place the liquid film under the multi-flow dry air knives arranged side by side and alternately arranged with three blowing channels and three suction channels at 1.5mm intervals, each blowing channel is blown at a flow rate (0.2MPa) of 200LPM Air, the air flow temperature is 100°C, each suction channel sucks at 250LPM, the area of ​​the dried liquid film is 600mm×400mm, the air knife moves at a speed of 30mm / s, and within 2s, the liquid film is completely dried and a layer of brown is obtained film.

[0052] 3) Place the dried film on a hot plate at 120°C for 9 minutes to obtain a transparent dark brown perovskite film, whose microscopic appearance is as follows: Image 6 Shown in (a) and (b).

Embodiment 3

[0054] 1) Using γ-butyrolactone as a solvent, configure CH with a concentration of 10% by mass 2 (NH 2 ) 2 PbClI 2 Solution, coating a layer of prepared perovskite solution on the conductive glass FTO substrate, the liquid film is light yellow and the thickness is about 3000nm.

[0055] 2) Place the liquid film under the multi-flow dry air knives arranged side by side and alternately arranged with three blowing channels and three suction channels at 0.01mm intervals, each blowing channel is blown at a flow rate (0.05MPa) of 50LPM Air, the air flow temperature is -20°C, each suction channel inhales at 100LPM, the area of ​​the dried liquid film is 80mm×30mm, the air knife moves at a speed of 10mm / s, within 3s, the liquid film is dried and a layer is obtained Brown film.

[0056] 3) Place the dried film on a hot plate at 50° C. for 10 h to obtain a layer of transparent dark brown perovskite film.

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Abstract

The invention provides a multi-flow drying air knife and a method used for preparing a perovskite thin film in a perovskite solar cell by using the same. A perovskite liquid film coated on the surface of a substrate is arranged under the multi-flow drying air knife, wherein several blowing passages and suction passages are alternatively arranged at intervals. Dilution airflow blown out by the blowing passages absorbs a solvent component when flowing through the surface of the perovskite liquid film to realize liquid film drying. The airflow leaves the liquid surface, enters the multi-flow drying air knife through the suction passages, and flows out. The solvent component in a solution is rapidly evaporated. The high-quality perovskite thin film in the perovskite solar cell is prepared by controlling the conditions of a drying process. According to the invention, the perovskite thin film with uniform and compact structure is acquired; leakage current caused by perovskite thin film holes is avoided, which is favorable for the preparation of the solar cell which has the advantages of high efficiency and large area; and the multi-flow drying air knife and the method have the advantages of simple operation, easy operation, low cost, high repeated accuracy, easy industrialization, continuous production and so on.

Description

technical field [0001] The invention belongs to the fields of material science technology, thin film preparation technology and solar cell preparation technology, and relates to the preparation of large-area thin films by solution method and its application in perovskite solar cells, in particular to a multi-flow drying air knife and the use of the air knife A method for preparing perovskite thin films in perovskite solar cells. Background technique [0002] In the field of photovoltaics, organic-metal halides with a perovskite structure, as a light-absorbing material, have attracted great attention in the photovoltaic industry due to their unique properties. The conversion efficiency of perovskite solar cells has improved by leaps and bounds in recent years. Chamber preparation small area (0.1cm 2 ) Perovskite solar cell efficiency has achieved 20.1%, large area (> 1cm 2 ) >20% has been achieved. As the basic material for photoelectric conversion in perovskite cell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/48
CPCH10K30/10Y02E10/549Y02P70/50
Inventor 杨冠军高黎黎李长久李成新
Owner 杨冠军
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