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Method for preparing perovskite thin film in perovskite solar cell via solution air extraction method

A solar cell and perovskite technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems that the uniformity and crystallinity of the film cannot be effectively controlled, it is difficult to apply in industrialization, and the substrate is exposed, so as to facilitate industrialization and Continuous production, high repeat accuracy, uniform and dense structure

Inactive Publication Date: 2016-06-22
XI AN JIAOTONG UNIV
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  • Summary
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  • Description
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  • Application Information

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Problems solved by technology

Although the one-step method is relatively simple to operate, there are some problems in the prepared perovskite film: the uniformity and crystallinity of the film cannot be effectively controlled, the grains of the perovskite film are coarse and dendritic, and the coverage of the substrate is low, resulting in Electrons are extremely easy to recombine with holes during transport, resulting in poor performance and insufficient stability of perovskite solar cells
The existing technical solutions are mainly through the natural drying of the solvent in the solution or direct heating and drying, it is difficult to achieve good control of the crystallization characteristics of the perovskite film, so a one-step method cannot obtain a uniform and dense perovskite film
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 will easily cause the solution surface to be unstable, which will cause uneven surface fluctuations of the perovskite film, which may cause the substrate to be exposed and affect the perovskite solar cell. Uniformity and photoelectric performance, difficult to industrial application

Method used

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  • Method for preparing perovskite thin film in perovskite solar cell via solution air extraction method
  • Method for preparing perovskite thin film in perovskite solar cell via solution air extraction method
  • Method for preparing perovskite thin film in perovskite solar cell via solution air extraction method

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Experimental program
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Effect test

Embodiment 1

[0046] 1) With DMF as solvent, PbI 2 and CH 3 NH 3 I is the solute, and the perovskite solution is prepared, and the CH in the perovskite solution 3 NH 3 PB 3 The mass percentage concentration is 35%.

[0047] 2) A layer of prepared perovskite solution was sprayed on the flexible conductive substrate ITO by spraying method to obtain a layer of light yellow perovskite liquid film with a thickness of about 1500nm.

[0048] 3) Exhaust and dry at 50°C. At this temperature, the saturated vapor pressure of the solvent is about 2200Pa. The perovskite liquid film is placed in a chamber of 400Pa. At this time, the pressure difference between the solvent and the chamber pressure is 1800Pa. The solvent evaporates quickly, and the liquid film has a very high degree of supersaturation, which satisfies the conditions for nucleation, and the liquid film nucleates and grows heterogeneously on the rough substrate. The solvent evaporated within 30s, and the obtained film was taken out aft...

Embodiment 2

[0052] 1) With DMSO as solvent, PbI 2 and CH 3 NH 3 I is the solute, and the perovskite solution is prepared, and the CH in the perovskite solution 3 NH 3 PB 3 The mass percentage concentration is 30%.

[0053] 2) Scrape-coat a layer of prepared perovskite solution on the conductive glass FTO substrate to obtain a layer of light yellow perovskite liquid film with a thickness of about 2000nm.

[0054] 3) Air extraction and drying are carried out at 70°C. At this temperature, the saturated vapor pressure of the solvent is about 5900Pa. The perovskite liquid film is placed in a chamber of 40Pa. At this time, the pressure difference between the solvent and the chamber pressure is 5860Pa. After the solvent evaporates, the liquid film reaches supersaturation, and the liquid film nucleates and grows heterogeneously on the surface of the rough substrate. The solvent evaporated within 10s, and the film was taken out after 10s, and the color of the film was dark red.

[0055] 4) ...

Embodiment 3

[0058] 1) With DMF as solvent, PbI 2 and CH 3 NH 3 I is the solute, and the perovskite solution is prepared, and the CH in the perovskite solution 3 NH 3 PB 3 The mass percentage concentration is 40%.

[0059] 2) Coating a layer of prepared perovskite solution on the conductive glass ITO substrate by coating method to obtain a layer of light yellow perovskite liquid film with a thickness of about 4000nm.

[0060] 3) Air extraction and drying are carried out at 25°C. At this temperature, the saturated vapor pressure of the solvent is about 550Pa. The perovskite liquid film is placed in a chamber of 500Pa. At this time, the pressure difference between the solvent and the chamber pressure is 50Pa. After the solvent evaporates, the liquid film reaches supersaturation, and the liquid film nucleates and grows heterogeneously on the surface of the rough substrate. The solvent evaporated within 60s, and the film was taken out after 60s, and the color of the film was dark red.

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Abstract

The invention provides a method for preparing a perovskite thin film in a perovskite solar cell via a solution air extraction method. The method comprises the following steps: a perovskite liquid film coated on a surface of a base body is subjected to air extracting and drying operation in an environment where partial pressure of the solvent is lower than 99% saturated vapor pressure of the solvent at current temperature; heterogeneous nucleation and growth of the surface of the base body can be realized via control over drying process conditions, and therefore a uniform and compact perovskite thin film can be formed. The method can be used for obtaining the uniform-structured and compact perovskite thin film, thus current leakage caused by perovskite thin film loopholes can be prevented and the method can help make high-efficiency solar cells; the method is advantaged by simple operation, easy-to-implement property, low cost, high repetition accuracy, convenience for industrialization and continuous production and the like.

Description

technical field [0001] The invention belongs to the technical field of solar cell preparation, and in particular relates to a method for preparing a perovskite film in a perovskite solar cell by using a solution pumping method. 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 increased by leaps and bounds in recent years, surpassing 20%. As the basic material for photoelectric conversion in perovskite solar cells, perovskite thin films are the key and core of perovskite solar cells. The preparation process mainly adopts solution method, including one-step method and two-step method. Although the one-step method is relatively simple to operate, there are some problems in the prepared perovskite film: the uniformity and crystallinity of t...

Claims

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Application Information

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IPC IPC(8): H01L51/48
CPCH10K71/12Y02E10/549Y02P70/50
Inventor 杨冠军李长久李成新高黎黎丁斌
Owner XI AN JIAOTONG UNIV
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