CN118251102A

CN118251102A - Solar cell, preparation method thereof and soaking device

Info

Publication number: CN118251102A
Application number: CN202410210294.4A
Authority: CN
Inventors: 时宇; 王殿曦; 徐晨鑫; 贺锐; 张学玲
Original assignee: Trina Solar Co Ltd
Current assignee: Trina Solar Co Ltd
Priority date: 2024-02-26
Filing date: 2024-02-26
Publication date: 2024-06-25

Abstract

The application relates to a solar cell, a preparation method thereof and a soaking device. A method of manufacturing a solar cell comprising a first electrode layer, a second electrode layer, and a perovskite layer disposed between the first electrode layer and the second electrode layer, the method comprising: forming inorganic salts contained in a precursor material of the perovskite layer on the first electrode layer to prepare an inorganic framework layer; forming a first organic salt contained in a precursor material of the perovskite layer on the inorganic framework layer to prepare an organic layer; and placing the semi-finished product formed after the preparation of the organic layer in an organic solvent for soaking treatment, so that the inorganic salt and the first organic salt react to generate the perovskite layer. The method is favorable for forming the perovskite layer with good crystallization quality and uniformity, so that the conversion efficiency of the solar cell is improved.

Description

Solar cell, preparation method thereof and soaking device

Technical Field

The application relates to the technical field of solar cells, in particular to a solar cell, a preparation method thereof and a soaking device.

Background

As a novel photovoltaic device, the perovskite solar cell has the advantages of adjustable forbidden bandwidth, low preparation cost, high absorption coefficient and the like, becomes a research hot spot in the field of new energy in recent years, and the energy conversion efficiency of the current small-area single-junction cell breaks through 26% along with the continuous development of technology.

The quality of the perovskite film directly determines the battery performance, however, when a solution method is used for preparing a large-area battery, the perovskite film with uniform high quality is difficult to form, and practical application is limited. The perovskite film deposited by the vapor phase evaporation method can effectively improve the crystallization quality and uniformity of the film, thereby improving the device performance, and therefore, the vapor phase evaporation method has great application potential in the preparation process of the perovskite film.

In the vapor phase evaporation method, the framework layer material and the organic layer material are generally reacted to form the perovskite thin film by one-step co-evaporation or two-step evaporation. However, due to the technical limitation of evaporation and deposition, the reaction difficulty of the framework layer and the organic layer material is high, so that the prepared film component structure is unexpected, and the improvement of the energy conversion efficiency of the perovskite solar cell is not facilitated.

Disclosure of Invention

Based on this, it is necessary to provide a solar cell which is advantageous for improving energy conversion efficiency, a method for manufacturing the same, and a soaking apparatus.

In a first aspect, the present application provides a method for preparing a solar cell, the solar cell including a first electrode layer, a second electrode layer, and a perovskite layer, the perovskite layer being disposed between the first electrode layer and the second electrode layer, the method comprising:

Forming inorganic salts contained in a precursor material of the perovskite layer on the first electrode layer to prepare an inorganic framework layer;

Forming a first organic salt contained in a precursor material of the perovskite layer on the inorganic framework layer to prepare an organic layer;

And placing the semi-finished product formed after the preparation of the organic layer in an organic solvent for soaking treatment, so that the inorganic salt and the first organic salt react to generate the perovskite layer.

In some embodiments, the soaking temperature is 80-150 ℃.

In some embodiments, the soaking time is 5 minutes to 10 minutes.

In some embodiments, the organic solvent is an alcohol having a boiling point of 60-150 ℃.

In some of these embodiments, the inorganic salt comprises a first inorganic salt and a second inorganic salt; the first inorganic salt comprises at least one of lead iodide, lead bromide and lead chloride; the second inorganic salt includes at least one of cesium bromide, cesium iodide, and cesium chloride.

In some embodiments, the inorganic skeleton layer is prepared by an evaporation method, the evaporation rate of the first inorganic salt is 1 a/s-2 a/s, and the evaporation rate of the second inorganic salt is 0.1 a/s-1 a/s.

In some embodiments, in the process of preparing the inorganic skeleton layer, the evaporation thickness of the first inorganic salt is controlled to be 200 nm-300 nm.

In some of these embodiments, the first organic salt comprises at least one of formamidine iodide, formamidine bromide, and formamidine chloride.

In some embodiments, the organic layer is prepared by an evaporation method, and the evaporation rate of the first organic salt is 1 a/s-2 a/s.

In some embodiments, in the process of preparing the organic layer, the evaporation thickness of the first organic salt is controlled to be 200 nm-400 nm.

In some of these embodiments, a second organic salt is additionally added to the organic solvent.

In some embodiments, the concentration of the second organic salt in the organic solvent is 1 mmol/L-2 mmol/L.

In some of these embodiments, the second organic salt comprises at least one of formamidine iodide, formamidine bromide, and formamidine chloride.

In some of these embodiments, the solar cell further comprises: a hole transport layer disposed between the first electrode layer and the perovskite layer, and a passivation layer, an electron transport layer, and a buffer layer disposed between the second electrode layer and the perovskite layer; the preparation method further comprises the following steps:

forming the hole transport layer on the first electrode layer prior to forming the perovskite layer; and

And after the perovskite layer is formed, before the second electrode layer is formed, sequentially laminating the passivation layer, the electron transport layer and the buffer layer on the surface of the perovskite layer, which is far away from the first electrode layer.

In a second aspect, the present application further provides a solar cell, which is prepared by the method for preparing a solar cell according to any one of the embodiments of the first aspect.

In a third aspect, the present application provides a steeping device comprising:

A cavity;

The accommodating component is arranged in the cavity and is provided with a groove for accommodating a workpiece to be treated and an organic solvent;

A temperature control assembly including a temperature sensor, a controller, and a heater; the heater is used for heating the organic solvent, the temperature sensor is used for detecting the temperature of the organic solvent, the controller is respectively and electrically connected with the temperature sensor and the heater, and the controller is used for controlling the heating state of the heater on the organic solvent according to the temperature detection result of the temperature sensor.

In some embodiments, the workpiece to be processed is a semi-finished product formed after the organic layer is prepared in the solar cell preparation process.

The application provides a preparation method of a solar cell, which comprises the steps of firstly taking precursor materials of a perovskite layer as raw materials in the process of forming the perovskite layer, sequentially forming an inorganic framework layer and an organic layer, then soaking a semi-finished product formed after the preparation of the organic layer in an organic solvent, and placing the inorganic framework layer and the organic layer which are difficult to react with each other in a solid phase in a liquid phase environment through soaking, so that the inorganic framework layer and the organic layer are dissolved, the contact opportunity of inorganic salt and first organic salt in the precursor materials is improved, the mutual reaction of the inorganic framework layer and the organic layer is promoted, and the perovskite layer with better crystallization quality and uniformity is formed, thereby improving the conversion efficiency of the perovskite solar cell.

Drawings

FIG. 1 is a flow chart of a process for fabricating a solar cell in some embodiments;

FIG. 2 is a schematic diagram of a solar cell in some embodiments;

fig. 3 is a schematic view of the structure of the soaking device in some embodiments.

Reference numerals illustrate:

1: a solar cell; 11: a first electrode layer; 12: a second electrode layer: 13: a perovskite layer; 14: a hole transport layer; 15: a passivation layer; 16: an electron transport layer; 17: a buffer layer; 2: a soaking device; 21: a cavity; 22: a holding assembly; 221: a groove; 23: a temperature control assembly; 24: an air outlet assembly; 25: an air intake assembly; 3: and (5) treating the workpiece.

Detailed Description

In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the embodiments that are illustrated below. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In a first aspect, as shown in fig. 1 and 2, the present application provides a method for manufacturing a solar cell 1, where the solar cell 1 includes a first electrode layer 11, a second electrode layer 12, and a perovskite layer 13, and the perovskite layer 13 is disposed between the first electrode layer 11 and the second electrode layer 12, and the manufacturing method includes steps S200 to S400.

Step S200: an inorganic salt contained in the precursor material of the perovskite layer 13 is formed on the first electrode layer 11 to prepare an inorganic skeleton layer.

Step S300: the organic layer is prepared by forming a first organic salt contained in the precursor material of the perovskite layer 13 on top of the inorganic framework layer.

Step S400: the semi-finished product formed after the preparation of the organic layer is subjected to a soaking treatment in an organic solvent so that the inorganic salt reacts with the first organic salt to produce the perovskite layer 13.

The application provides a preparation method of a solar cell 1, in the process of forming a perovskite layer 13, firstly, an inorganic framework layer and an organic layer are sequentially formed by taking precursor materials of the perovskite layer 13 as raw materials, then, a semi-finished product formed after the preparation of the organic layer is soaked in an organic solvent, and the inorganic framework layer and the organic layer which are difficult to react with each other in a solid phase can be placed in a liquid phase environment through soaking, so that the inorganic framework layer and the organic layer are dissolved, the contact opportunity of inorganic salt and first organic salt in the precursor materials is improved, the mutual reaction of the inorganic framework layer and the first organic salt is promoted, the reaction of the inorganic framework layer and the organic layer can be finely regulated, the perovskite layer 13 with better crystallization quality and uniformity is formed, non-radiative recombination is inhibited, the transmission of carriers is promoted, the filling factor and the open-circuit voltage of a device are improved, and the conversion efficiency of the solar cell 1 is improved.

In some embodiments, the soaking temperature is 80-150 ℃. The soaking temperature is not more than 150 c, is easier to operate, and does not adversely affect the performance of the first electrode layer 11.

In some embodiments, the soaking time is 5 minutes to 10 minutes.

In some embodiments, the organic solvent is an alcohol having a boiling point of 60-150 ℃. The organic solvent can simultaneously dissolve the inorganic salt and the first organic salt, has a low boiling point, and can volatilize in a soaking environment to form a vapor atmosphere after being heated, so that the inorganic salt and the first organic salt are more fully contacted. And after the reaction is finished, the solvent is more easily pumped away, which is beneficial to obtaining the dried perovskite layer 13. Further, the organic solvent may be, for example, but not limited to, isopropyl alcohol, methanol, ethanol, and the like.

In some of these embodiments, the inorganic salt comprises a first inorganic salt and a second inorganic salt. Further, the first inorganic salt includes at least one of lead iodide, lead bromide, and lead chloride. Further, the second inorganic salt includes at least one of cesium bromide, cesium iodide, and cesium chloride.

Further, an evaporation method is adopted to prepare the inorganic framework layer, the evaporation rate of the first inorganic salt is 1A/s-2A/s, and the evaporation rate of the second inorganic salt is 0.1A/s-1A/s. The evaporation rates of the first inorganic salt and the second inorganic salt are controlled in a proper range, so that the proportion of the first inorganic salt and the second inorganic salt is proper, and evaporation is uniform, and the perovskite layer 13 with better uniformity can be obtained after the formed inorganic framework layer further reacts with the organic layer.

Further, in the process of preparing the inorganic framework layer, the evaporation thickness of the first inorganic salt is controlled to be 200 nm-300 nm. The thickness of the inorganic skeleton layer can be controlled within a proper range by controlling the evaporation thickness of the first inorganic salt.

Further, an evaporation method is adopted to prepare an organic layer, and the evaporation rate of the first organic salt is 1A/s-2A/s. The evaporation rate of the organic salt is controlled within a proper range, so that good evaporation uniformity and high evaporation efficiency can be ensured.

In some embodiments, the evaporation thickness of the first organic salt is controlled to be 200nm to 400nm during the preparation of the organic layer. The thickness of the organic layer can be further controlled within a suitable range by controlling the evaporation thickness of the organic salt.

In some of these embodiments, a second organic salt is additionally added to the organic solvent. And a proper amount of second organic salt is additionally added into the organic solvent, so that the content of the organic salt dissolved in the organic solvent can be increased, and the reaction degree of the inorganic salt material in the inorganic framework layer and the organic salt can be improved.

Further, the concentration of the second organic salt in the organic solvent is 1 mmol/L-2 mmol/L.

Further, the second organic salt includes at least one of formamidine iodide, formamidine bromide, and formamidine chloride. It will be appreciated that the second organic salt may be the same as the first organic salt or may be different from the first organic salt.

In some of these embodiments, the material of the first electrode layer 11 is selected from at least one of indium tin oxide and fluorine doped tin oxide.

In some of these embodiments, the material of the second electrode layer 12 is selected from at least one of silver and copper.

In some embodiments, the thickness of the first electrode layer 11 is 150nm to 200nm.

In some embodiments, the thickness of the second electrode layer 12 is 150nm to 300nm.

It will be appreciated that the solar cell 1 provided by the preparation method of the present application may be either a positive cell or an inverted cell.

In some of these embodiments, the solar cell 1 is an inverted cell.

Further, the solar cell 1 further includes: a hole transport layer 14 disposed between the first electrode layer 11 and the perovskite layer 13, and a passivation layer 15, an electron transport layer 16, and a buffer layer 17 disposed between the second electrode layer 12 and the perovskite layer 13. The preparation method also comprises the following step S100 and step S500.

Step S100: before the perovskite layer 13 is formed, a hole transport layer 14 is formed on the first electrode layer 11.

Further, the material of the hole transport layer 14 is selected from at least one of poly (3, 4-ethylenedioxythiophene) -poly (styrenesulfonic acid), [4- (3, 6-dimethyl-9H-carbazol-9-yl) butyl ] phosphonic acid, and [2- (3, 6-dimethoxy-9H-carbazol-9-yl) ethyl ] phosphonic acid.

Further, the thickness of the hole transport layer 14 is 20nm to 40nm.

Step S500: after the perovskite layer 13 is formed, before the second electrode layer 12 is formed, a passivation layer 15, an electron transport layer 16, and a buffer layer 17 are sequentially laminated on the surface of the perovskite layer 13 remote from the first electrode layer 11.

Further, the material of the passivation layer 15 is selected from at least one of 2-thiopheneethylamine hydrochloride, 1, 4-phenylenediamine hydroiodinate, and phenylethanolamine iodinate.

Further, the material of the electron transport layer 16 is selected from at least one of fullerenes and fullerene derivatives.

Further, the material of the buffer layer 17 is at least one selected from bath copper and tin dioxide.

Further, the thickness of the passivation layer 15 is 10nm to 30nm.

Further, the thickness of the electron transport layer 16 is 20nm to 40nm.

Further, the thickness of the buffer layer 17 is 5nm to 10nm.

In a second aspect, the present application further provides a solar cell 1, which is prepared by the method for preparing a solar cell 1 according to any one of the embodiments of the first aspect.

In a third aspect, as shown in figure 3, the present application provides a steeping device 2 comprising:

A cavity 21;

a holding assembly 22, the holding assembly 22 is arranged in the cavity 21, the holding assembly 22 is provided with a groove 221, and the groove 221 is used for holding the workpiece 3 to be processed and the organic solvent;

A temperature control assembly 23, the temperature control assembly 23 including a temperature sensor, a controller, and a heater; the heater is used for heating the organic solvent, the temperature sensor is used for detecting the temperature of the organic solvent, the controller is respectively and electrically connected with the temperature sensor and the heater, and the controller is used for controlling the heating state of the heater on the organic solvent according to the temperature detection result of the temperature sensor.

In some of these embodiments, the workpiece 3 to be treated is a semifinished product formed after the organic layer is prepared during the preparation of the solar cell 1. In the process of manufacturing the solar cell 1, after sequentially forming the inorganic skeleton layer and the organic layer on the first electrode layer 11, the obtained semi-finished product may be placed in the above-described soaking apparatus 2 to be soaked. The soaking device 2 can control the heating temperature of the organic solvent through the temperature control assembly 23. Further, the organic solvent is selected from alcohols with low boiling point, and is easy to volatilize after heating, so that the gas atmosphere in the cavity 21 can be adjusted, the condition of solvent vapor annealing is formed, and finally the fine regulation and control of the reaction of the framework layer and the organic layer are finished, and the perovskite layer 13 with good crystallization quality and high uniformity is obtained.

In some embodiments, the heater is disposed inside the heating cavity 21 and is located at the bottom of the side of the containing assembly 22 facing away from the groove 221, and the heater heats the organic solvent through the groove 221.

In some embodiments, the temperature sensor includes a temperature measuring end and a signal end, the temperature measuring end is in contact with the groove 221, the signal end is connected with the controller, the temperature measuring end indirectly detects the temperature of the organic solvent by detecting the temperature of the groove 221, and the signal end feeds back the detected temperature to the controller.

In some of these embodiments, the controller is disposed outside of the cavity 21.

In some of these embodiments, the infusion device 2 further comprises:

And one end of the air outlet assembly 24 is communicated with the inside of the cavity 21, the other end of the air outlet assembly 24 is communicated with the outside, and the air outlet assembly 24 is used for pumping the volatilized organic solvent out of the cavity 21. The air outlet assembly 24 can sufficiently pump out the volatilized organic solvent, so that the formed perovskite layer 13 has better drying property.

In some of these embodiments, the infusion device 2 further comprises:

and one end of the air inlet assembly 25 is communicated with the inside of the cavity 21, the other end of the air inlet assembly 25 is communicated with the outside, and the air inlet assembly 25 is used for introducing air into the cavity 21. The air inlet assembly 25 can be used for introducing air into the cavity 21, so that the normal pressure in the cavity 21 is recovered, and the workpiece 3 to be treated is conveniently taken out.

In some embodiments, the number of grooves 221 on the holding assembly 22 is plural, and the grooves 221 are independent from each other. The plurality of different workpieces 3 to be processed and the organic solvent can be contained through the plurality of different grooves 221 without mutual pollution, so that the plurality of workpieces 3 to be processed can be processed simultaneously, and the production efficiency can be improved.

The following are specific examples.

Example 1

Referring to fig. 1 and 2, a method for manufacturing a solar cell 1 includes the steps of:

(1) Providing a substrate, wherein a transparent conductive electrode made of indium tin oxide is arranged on the substrate, the transparent conductive electrode is a first electrode layer 11, and the thickness of the first electrode layer 11 is 150nm. The surface of the first electrode layer 11 was spin-coated with an ethanol solution of the self-assembled material MeO-2PACz, wherein the concentration of MeO-2PACz was 5mmol/L, the spin-coating rotation speed was 3000rpm, the spin-coating time was 30s, and the spin-coated material was heated at a temperature of 100℃for 5 minutes to form the hole transport layer 14 having a thickness of 30 nm.

(2) And (2) evaporating a first inorganic salt and a second inorganic salt on the hole transport layer 14 formed in the step (1), wherein the first inorganic salt is PbI ₂, the second inorganic salt is CsBr, the evaporation rate of PbI ₂ is 1.5 a/s, the evaporation rate of CsBr is 0.5 a/s, and the inorganic skeleton layer is formed after stopping when the evaporation thickness of PbI ₂ is controlled to be 200 nm.

(3) Evaporating a first organic salt on the inorganic framework layer formed in the step (2), wherein the first organic salt is FAI, the evaporation rate of the FAI is 1A/s, and the evaporation of the FAI is controlled to be stopped when the evaporation thickness of the FAI is 200nm, so that an organic layer is formed.

(4) Soaking the semi-finished product formed after the organic layer is prepared in the step (3) by using a soaking device 2 shown in fig. 3, placing the semi-finished product into a groove 221 in the soaking device 2, adding an isopropanol solution of a second organic salt FAI into the groove 221, wherein the concentration of the FAI is 1.6mmol/L, completely immersing the semi-finished product in the solution, heating the isopropanol solution of the FAI to 80 ℃ by a temperature control component, and continuously heating and soaking for 5 minutes to enable inorganic salt and organic salt to react, so as to generate a perovskite layer 13. After the soaking is finished, the residual isopropyl alcohol solution of the FAI is evaporated and pumped out through the air outlet assembly 24, air is introduced into the cavity 21 by the air inlet assembly 25, the air pressure in the cavity 21 is restored to normal pressure, and then the soaked semi-finished product is taken out.

(5) And (3) spin-coating an isopropanol solution of TEACl on the perovskite layer 13 formed in the step (4), wherein the concentration of TEACl is 3mg/ml, the spin-coating rotating speed is 3000 rpm, the coating time is 30s, and the passivation layer 15 with the thickness of 15nm is formed after drying.

(6) And (3) evaporating C ₆₀ on the passivation layer 15 formed in the step (5) to form an electron transport layer 16 with the thickness of 20 nm.

(7) And (3) evaporating BCP on the electron transport layer 16 formed in the step (6) to form a buffer layer 17 with the thickness of 5 nm.

(8) Ag metal was vapor deposited on the buffer layer 17 of step (7) to form the second electrode layer 12 having a thickness of 150 nm.

Comparative example 1

The procedure is substantially as in example 1, except that after the organic layer is formed in step (3), the semi-finished product is not immersed in an organic solvent.

The performance parameters of the solar cells prepared in example 1 and comparative example 1 were tested, and the test results are shown in table 1 below.

Table 1 performance parameters of solar cells

As can be seen from table 1, in example 1, the open circuit voltage, the short circuit current density, the fill factor and the conversion efficiency of the prepared solar cell were all significantly improved by performing the soaking treatment on the semi-finished product after the organic layer was formed, as compared with comparative example 1.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.

Claims

1. A method of manufacturing a solar cell, the solar cell comprising a first electrode layer, a second electrode layer, and a perovskite layer disposed between the first electrode layer and the second electrode layer, the method comprising:

2. The method for manufacturing a solar cell according to claim 1, wherein the soaking treatment is performed under at least one of the following conditions:

(1) The soaking temperature is 80-150 ℃;

(2) The soaking time is 5-10 minutes;

(3) The organic solvent is alcohols with the boiling point of 60-150 ℃.

3. The method for manufacturing a solar cell according to any one of claims 1 to 2, wherein the inorganic salt includes a first inorganic salt and a second inorganic salt;

The first inorganic salt comprises at least one of lead iodide, lead bromide and lead chloride;

The second inorganic salt includes at least one of cesium bromide, cesium iodide, and cesium chloride.

4. The method according to claim 3, wherein the inorganic skeleton layer is prepared by an evaporation method, the evaporation rate of the first inorganic salt is 1 a/s to 2 a/s, and the evaporation rate of the second inorganic salt is 0.1 a/s to 1 a/s.

5. The method according to claim 4, wherein the evaporation thickness of the first inorganic salt is controlled to be 200nm to 300nm in the process of preparing the inorganic skeleton layer.

6. The method for manufacturing a solar cell according to any one of claims 1 to 2, wherein the first organic salt includes at least one of formamidine iodide, formamidine bromide, and formamidine chloride.

7. The method according to claim 6, wherein the organic layer is prepared by an evaporation method, and the evaporation rate of the first organic salt is 1 a/s to 2 a/s.

8. The method for manufacturing a solar cell according to claim 7, wherein an evaporation thickness of the first organic salt is controlled to be 200nm to 400nm in the process of manufacturing the organic layer.

9. The method for producing a solar cell according to any one of claims 1 to 2, 4 to 5, and 7 to 8, wherein a second organic salt is additionally added to the organic solvent;

Optionally, the concentration of the second organic salt in the organic solvent is 1 mmol/L-2 mmol/L;

Optionally, the second organic salt comprises at least one of formamidine iodide, formamidine bromide, and formamidine chloride.

10. The method for manufacturing a solar cell according to any one of claims 1 to 2,4 to 5, 7 to 8, wherein the solar cell further comprises: a hole transport layer disposed between the first electrode layer and the perovskite layer, and a passivation layer, an electron transport layer, and a buffer layer disposed between the second electrode layer and the perovskite layer; the preparation method further comprises the following steps:

11. A solar cell, characterized in that it is prepared by the method for preparing a solar cell according to any one of claims 1 to 10.

12. A soaking device, comprising:

A cavity;

13. The soaking device according to claim 12, wherein the workpiece to be treated is a semi-finished product formed after the organic layer is prepared in the solar cell preparation process.