CN114284438A - Coumarin-containing perovskite solar cell and preparation method thereof - Google Patents
Coumarin-containing perovskite solar cell and preparation method thereof Download PDFInfo
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Abstract
The invention provides a coumarin-containing perovskite solar cell and a preparation method thereof, and relates to the technical field of solar cell preparation. According to the invention, the coumarin is added in the perovskite light absorption layer, so that oxygen in a coumarin molecular structure is bonded with elements in the perovskite, the crystallinity of the perovskite is further improved, the defects in the perovskite are passivated, the loss of a photon-generated carrier of the perovskite solar cell is reduced, and the photoelectric conversion efficiency and the operation stability of the perovskite solar cell are improved.
Description
Technical Field
The invention relates to the technical field of solar cell preparation, in particular to a coumarin-containing perovskite solar cell and a preparation method thereof.
Background
With the continuous application of solar energy in the field of novel photovoltaic power generation, solar cells are also rapidly developed by exploring new materials, new processes and new structures. Among them, perovskite solar cells widely used are receiving attention because they have excellent photoelectric conversion efficiency. The perovskite in the perovskite solar cell has polycrystallization, which means that a great number of defects exist in the interior and on the surface of the thin film formed by the perovskite. While defects in perovskite thin films have been considered as recombination sites for photogenerated carriers and the main channel for water/oxygen permeation. Therefore, the high quality of the perovskite thin film directly determines the photoelectric properties of the polycrystalline perovskite solar cell. The additive engineering is an effective method for improving the quality of the perovskite thin film and simultaneously improving the photoelectric property of the perovskite solar cell. The biomolecular additive is developed rapidly in the additive engineering by virtue of the unique advantages of environmental protection, low cost, wide sources and multiple varieties.
However, current biomolecular additives are more and more focused on the aspects of control of perovskite thin film crystallization, defect passivation and energy level optimization. Therefore, from the aspect of molecular design, the development of the functional additive which can simultaneously perform crystallization control and defect passivation on the perovskite thin film and promote the photoelectric property and the operation stability of the device still has great challenge.
Disclosure of Invention
The invention solves the problems of crystal regulation and defect passivation of the perovskite thin film and promotion of photoelectric property and operation stability of the corresponding perovskite solar cell.
In order to solve the problems, the invention provides a coumarin-containing perovskite solar cell which comprises a conductive substrate, a nickel oxide hole transport layer, a perovskite light absorption layer, an electron transport modification layer and an electrode layer, wherein the perovskite light absorption layer comprises an additive, and the additive comprises coumarin.
Further, the preparation method of the perovskite light absorption layer comprises the following steps: coumarin is added into the perovskite precursor solution, and the perovskite light absorption layer is prepared by a spin coating method.
Further, the content of the coumarin added into the perovskite precursor solution is 0.1-6 mg/ml.
Further, the perovskite precursor solution comprises a perovskite material and a precursor solvent, wherein the perovskite material comprises methylamine lead iodide and formamidine lead iodide; the precursor solvent includes at least one of N-methylpyrrolidone, dimethylformamide, γ -butyrolactone, and dimethyl sulfoxide.
Compared with the prior art, the coumarin-containing perovskite solar cell has the advantages that the coumarin is added into the perovskite light absorption layer, so that oxygen in a coumarin molecular structure is bonded with elements in perovskite, the crystallinity of the perovskite is improved, the defects in the perovskite are passivated, the loss of photo-generated carriers of the perovskite solar cell is reduced, and the photoelectric conversion efficiency and the operation stability of the perovskite solar cell are improved.
The invention also provides a preparation method of the coumarin-containing perovskite solar cell, which comprises the following steps:
step S1: after ultraviolet ozone treatment is carried out on a conductive substrate, coating a tetrahydrate nickel acetate solution on the conductive substrate to obtain a nickel oxide hole transport layer;
step S2: adding coumarin into the perovskite precursor solution, heating and stirring to obtain a coumarin-containing perovskite precursor solution; coating the coumarin-containing perovskite precursor solution on the nickel oxide hole transport layer, and annealing to obtain a perovskite light absorption layer;
step S3: coating [6,6] -phenyl-C71-methyl butyrate solution on the perovskite light absorption layer to obtain an electron transport layer;
step S4: coating a polyimide solution on the electron transport layer to obtain an electron transport modification layer; and adding an electrode layer on the electron transmission modification layer to obtain the coumarin-containing perovskite solar cell.
Further, in step S1, the concentration of the nickel acetate tetrahydrate solution comprises 0.1-0.5 mol/ml.
Further, in step S2, dropping an anti-solvent while coating the coumarin-containing perovskite precursor solution on the nickel oxide hole transport layer.
Further, in step S2, the heating temperature includes 25 ℃ to 70 ℃, and the stirring time includes: 15-60 min.
Further, in step S3, the concentration of the [6,6] -phenyl-C71-butyric acid methyl ester solution comprises 10-30 mg/ml.
Further, in step S4, the polyimide solution includes polyimide and isopropanol, and the mass ratio of the polyimide to the isopropanol includes 1: (100-500).
Compared with the prior art, the preparation method of the coumarin-containing perovskite solar cell has the advantages that coumarin is added into the perovskite precursor solution, so that oxygen in a coumarin molecular structure is bonded with elements in the perovskite precursor solution, the crystallinity of perovskite is improved, defects in perovskite are passivated, loss of photogenerated carriers of the perovskite solar cell is reduced, and the photoelectric conversion efficiency and the operation stability of the perovskite solar cell are improved. The perovskite light absorption layer prepared by the spin-coating method has a simple preparation process, and the finally formed perovskite solar cell has low cost and is green and environment-friendly. The nickel oxide hole transport layer adopted by the invention can improve the stability of the device, is beneficial to coating and film forming of the perovskite precursor, and improves the absorption rate of the perovskite light absorption layer; the [6,6] -phenyl-C71-methyl butyrate is used as an electron transport layer, so that the preparation process can be simplified, and the preparation efficiency can be improved; and the performance of the perovskite solar cell can be improved by adopting the polyacetyl imine as the electron transmission modification layer, and finally the preparation of the high-performance coumarin-containing perovskite solar cell is realized.
Drawings
Fig. 1 is a flow chart of the preparation of coumarin-containing perovskite solar cells in an embodiment of the invention;
FIG. 2 is a schematic illustration of the layered structure of a coumarin-containing perovskite solar cell in an embodiment of the present invention;
FIG. 3 is a graph of the UV-VIS absorption spectra of perovskite light absorbing layers prepared in comparative example 2 and example 1 of the present invention;
FIG. 4 is an XRD pattern of perovskite light absorbing layers of example 1 and comparative example 1 in examples of the present invention;
FIG. 5 is a J-V plot of perovskite solar cells of example 1 and comparative example 1 in examples of the present invention;
FIG. 6 is a J-V plot of perovskite solar cells of example 1 and comparative example 3 in examples of the present invention;
fig. 7 is a graph of normalized photoelectric efficiency conversion of the perovskite solar cells of example 1 and comparative example 1 stored in air in the examples of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
It is noted that the description of the term "some specific embodiments" in the description of the embodiments herein is intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Throughout this specification, the schematic representations of the terms used above do not necessarily refer to the same implementation or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiment of the invention provides a coumarin-containing perovskite solar cell which comprises a conductive substrate, a nickel oxide hole transport layer, a perovskite light absorption layer, an electron transport modification layer and an electrode layer, wherein the perovskite light absorption layer comprises an additive, and the additive comprises coumarin.
According to the coumarin-containing perovskite solar cell disclosed by the embodiment of the invention, the coumarin is added into the perovskite light absorption layer, so that oxygen in a coumarin molecular structure is bonded with elements in perovskite, the crystallinity of the perovskite is further improved, the defects in the perovskite are passivated, the loss of photo-generated carriers of the perovskite solar cell is reduced, and meanwhile, the photoelectric conversion efficiency and the operation stability of the perovskite solar cell are improved.
In some specific embodiments, the perovskite light absorbing layer is prepared by a method comprising: coumarin is added into the perovskite precursor solution, and the perovskite light absorption layer is prepared by a spin coating method. Therefore, the coumarin is fully dispersed in the perovskite precursor solution and bonded with elements in the perovskite, so that the crystallinity of the perovskite is fully improved, and defects in the perovskite are passivated.
In some embodiments, the amount of coumarin added to the perovskite precursor solution comprises 0.1 to 6 mg/ml. Therefore, the addition amount of coumarin as an additive is accurate, the crystallinity of the perovskite is further optimized, and defects are passivated.
In some specific embodiments, the perovskite precursor solution comprises a perovskite material and a precursor solvent, the perovskite material comprising methylamine lead iodide and formamidine lead iodide; the precursor solvent comprises at least one of N-methyl pyrrolidone, dimethylformamide, gamma-butyrolactone and dimethyl sulfoxide.
The perovskite material of the embodiment of the invention adopts methylamine lead iodide or formamidine lead iodide, and oxygen in a coumarin molecular structure is bonded with lead in the perovskite material, so that the crystallinity of the perovskite is improved, the defects in the perovskite are passivated, and the overall performance of the perovskite solar cell and the operation stability of the perovskite solar cell in the air are improved.
With reference to fig. 1, an embodiment of the present invention further provides a method for manufacturing a coumarin-containing perovskite solar cell, including the following steps:
step S1: after ultraviolet ozone treatment is carried out on the conductive substrate, coating a tetrahydrate nickel acetate solution on the conductive substrate to obtain a nickel oxide hole transport layer;
step S2: adding coumarin into the perovskite precursor solution, heating and stirring to obtain a coumarin-containing perovskite precursor solution; coating a coumarin-containing perovskite precursor solution on a nickel oxide hole transport layer, and annealing to obtain a perovskite light absorption layer;
step S3: coating [6,6] -phenyl-C71-methyl butyrate solution on a perovskite light absorption layer to obtain an electron transport layer;
step S4: coating a polyacetyl imine solution on the electron transmission layer to obtain an electron transmission modification layer; and adding an electrode layer on the electron transmission modification layer to obtain the coumarin-containing perovskite solar cell.
According to the preparation method of the coumarin-containing perovskite solar cell, coumarin is added into the perovskite precursor solution, so that oxygen in a coumarin molecular structure is bonded with elements in the perovskite precursor solution, the crystallinity of perovskite is improved, the defects in perovskite are passivated, the loss of photo-generated carriers of the perovskite solar cell is reduced, and the photoelectric conversion efficiency and the operation stability of the perovskite solar cell are improved.
In the step S1 of the embodiment of the invention, the conductive substrate is ultrasonically cleaned, dried by nitrogen, and treated by ultraviolet ozone for 20-30 minutes to obtain a clean conductive substrate. The conductive substrate in this embodiment may be an ITO conductive glass substrate or an FTO conductive glass substrate. In the embodiment, before the conductive substrate is coated with the nickel acetate tetrahydrate solution, the conductive substrate and the nickel acetate tetrahydrate solution are preheated, after the heating temperature is 40-150 ℃, the nickel acetate tetrahydrate solution is coated on the conductive substrate, and the annealing is carried out at the temperature of 200-450 ℃ for 30-120min, so that the nickel oxide hole transport layer is obtained.
In step S2 of the embodiment of the invention, the coumarin-containing perovskite precursor solution is spin-coated on the nickel oxide hole transport layer at a spin-coating speed of 1000-.
In step S3 of the embodiment of the invention, a [6,6] -phenyl-C71-methyl butyrate solution is spin-coated on the perovskite light absorption layer at the spin-coating speed of 1000-4000r/min for 20-50S, and the electron transport layer is obtained after annealing for 1-10min at the temperature of 60-90 ℃.
In step S4 in this embodiment, a polyimide solution is coated on the electron transport layer, the spin coating speed is 1000-;
the electrode layer in this embodiment is preferably a silver electrode layer, and is obtained by vacuum evaporation on the electron transport modification layer, and specifically, the thickness of the silver electrode layer may be 80nm to 120 nm. Thus, the conductive sheet has stable and excellent conductive properties.
In some specific embodiments, the concentration of the nickel acetate tetrahydrate solution in step S1 includes 0.1-0.5 mol/ml. Therefore, the prepared nickel oxide hole transport layer has a good hole transport effect.
In some specific embodiments, step S2 further includes dropping an anti-solvent while coating the coumarin-containing perovskite precursor solution on the nickel oxide hole transport layer. In the embodiment, an anti-solvent is dripped in the process of spin-coating the coumarin-containing perovskite precursor solution, wherein the anti-solvent comprises diethyl ether, chlorobenzene, toluene or anisole, and the dripping amount is 0.1-1 ml. Therefore, the dropwise addition of the anti-solvent is beneficial to balancing electron and hole transmission, the transmission performance of a contact interface is improved, and the overall performance and the air stability of the battery are improved.
In some specific embodiments, in step S2, the heating temperature comprises 25 ℃ to 70 ℃, and the stirring time comprises: 15-60 min. Therefore, the dispersion and reaction rate of coumarin in the perovskite precursor solution are improved.
In some specific embodiments, in step S3, the concentration of the [6,6] -phenyl-C71-butyric acid methyl ester solution comprises 10-30 mg/ml. Thus, the electron transport layer obtained has good electron transport properties.
In some specific embodiments, in step S4, the polyimide solution includes polyimide and isopropanol, and the mass ratio of the polyimide to the isopropanol includes 1: (100-500). Therefore, the injection and migration rates of electrons are improved, the recombination of electrons and holes is reduced, and the performance of the perovskite solar cell is improved.
Example 1
As shown in fig. 2 to 7, the method for preparing a coumarin-containing perovskite solar cell according to the embodiment of the present invention includes the following steps:
step S1: and sequentially performing ultrasonic treatment on the etched FTO conductive glass in ultrapure water, a cleaning agent, ultrapure water, acetone and isopropanol for 30min, drying by using nitrogen, and performing ultraviolet ozone treatment for 20min to obtain a clean FTO conductive glass substrate.
0.1244 g of nickel acetate tetrahydrate is dissolved in a mixed solvent of 1mL of ethylene glycol and 35. mu.L of ethylenediamine, and stirred at room temperature for 2 hours to obtain a nickel acetate tetrahydrate solution. Preheating a nickel acetate tetrahydrate solution and an FTO conductive glass substrate on a heating plate at 100 ℃ for 5min, dripping 100 mu L of the preheated nickel acetate tetrahydrate solution onto the preheated FTO conductive glass substrate, spin-coating for 30s at the rotating speed of 4000r/min, and annealing the FTO substrate coated with the nickel acetate tetrahydrate solution at 400 ℃ for 80min to obtain a nickel oxide hole transport layer.
Step S2: 0.461g of lead iodide and 0.159g of methylamine iodide are dissolved in a mixed solvent of 550 mu L of N-methyl pyrrolidone (NMP) and 450 mu L of dimethyl formamide (DMF), 5mg of coumarin is added as an additive, the mixture is stirred for 30min at 50 ℃ to obtain a coumarin-containing perovskite precursor solution, the coumarin-containing perovskite precursor solution is dripped on a nickel oxide hole transport layer, the nickel oxide hole transport layer is spin-coated for 70s at the rotating speed of 4000r/min, 1mL of diethyl ether is dripped on the 30 th s to serve as an anti-solvent, and the nickel oxide hole transport layer coated with the perovskite precursor solution is annealed for 30min at 120 ℃ to obtain the perovskite light absorption layer.
Step S3: 30mg of [6,6] -phenyl-C71-butyric acid methyl ester was dissolved in 1mL of anhydrous chlorobenzene to obtain a chlorobenzene solution of [6,6] -phenyl-C71-butyric acid methyl ester. 50 mu L of chlorobenzene solution of [6,6] -phenyl-C71-methyl butyrate is dripped on the perovskite light absorption layer, spin coating is carried out for 30s at the rotating speed of 1000r/min, and the perovskite light absorption layer coated with the chlorobenzene solution of [6,6] -phenyl-C71-methyl butyrate is annealed for 5min at the temperature of 60 ℃ to obtain the electron transmission layer.
Step S4: 50.2mg of a 50% (w/v) aqueous solution of polyacetylimine is dissolved in 20mL of isopropanol and subjected to ultrasonic treatment for 2min to obtain a solution of polyacetylimine in isopropanol in a mass ratio of 1: 400. Dropping 100 mu L of isopropanol solution of the polyacetimide on the electron transmission layer, spin-coating for 50s at the rotating speed of 3000r/min, and annealing the electron transmission layer coated with the isopropanol solution of the polyacetimide at 120 ℃ for 5min to obtain the electron transmission modification layer.
And evaporating 100nm silver as an electrode on the electron transport layer modification layer obtained by adopting a vacuum thermal evaporation technology to finally obtain the coumarin-containing perovskite solar cell.
The photoelectric conversion efficiency, open circuit voltage, short circuit current and fill factor of the coumarin-containing perovskite solar cell prepared in this example under standard test conditions (am1.5g illumination) are detailed in table 1.
Comparative example 1
As shown in fig. 2 to 7, part of the contents in step S2 in embodiment 1 is replaced with: 0.461g of lead iodide and 0.159g of methylamine iodide are dissolved in a mixed solvent of 550 mu LNMP and 450 mu LDMF, the mixture is stirred for 30min at the temperature of 50 ℃ to obtain a perovskite precursor solution, and the perovskite precursor solution is dripped on a nickel oxide hole transport layer to obtain a perovskite light absorption layer. The rest of the contents are the same as those of embodiment 1.
The data for photoelectric conversion efficiency, open circuit voltage, short circuit current and fill factor for the perovskite solar cell devices prepared in this comparative example are detailed in table 1 under standard test conditions (am1.5g illumination).
The performance of the solar cells of the above example 1 and comparative example 1 is shown in the following table 1:
TABLE 1
Therefore, the perovskite solar cell added with coumarin has higher energy conversion efficiency, and the open-circuit voltage, the short-circuit current and the filling factor are improved relative to the perovskite solar cell without the coumarin.
Comparative example 2
As shown in fig. 2 to 7, part of the contents in step S1 in embodiment 1 is replaced with: a mixture of 10mg of poly (bis (4-phenyl) (2,4, 6-trimethylphenyl) amine) (PTAA) and 1mg of 2,3,5, 6-tetrafluoro-7, 7,8, 8-tetracyanoquinodimethane (F4TCNQ) in 1mL of chlorobenzene was stirred at room temperature for 2 hours to give a PTAA-doped solution. And (3) dropping 100 mu of LPTAA doping solution onto a clean FTO conductive glass substrate, spin-coating for 20s at the rotating speed of 5000r/min, and annealing the FTO substrate coated with the PTAA doping solution at 100 ℃ for 10min to obtain the PTAA hole transport layer. The rest of the contents are the same as those of embodiment 1.
The UV-visible absorption spectra of the perovskite thin film prepared in this comparative example and the perovskite light-absorbing layer of example 1 at room temperature in air are shown in FIG. 3. It can be seen that the absorbance of the perovskite light-absorbing layer when PTAA was selected as the hole transport layer was lower than the absorbance of the perovskite light-absorbing layer when the nickel oxide hole transport layer was used.
Comparative example 3
As shown in fig. 2 to 7, part of the contents in step S4 in embodiment 1 is replaced with: 5mg of Bathocuproine (BCP) is dissolved in 5mL of isopropanol and subjected to ultrasonic treatment for 2min to obtain a saturated solution of BCP. And (3) dripping 100 mu L of supernatant of saturated BCP solution on the electron transport layer, spin-coating for 40s at the rotating speed of 4000r/min, and annealing the electron transport layer coated with the saturated BCP solution at 120 ℃ for 5min to obtain the electron transport modification layer. The rest of the contents are the same as those of embodiment 1.
The J-V curves of the perovskite solar cell devices prepared in this comparative example and example 1 under standard test conditions (am1.5g illumination) are shown in fig. 6. Therefore, when the BCP is used as the electron transmission modification layer, the current density of the perovskite solar cell device is lower than that of the perovskite solar cell device when the PEI electron transmission modification layer is formed.
Example 2
The preparation method of the coumarin-containing perovskite solar cell comprises the following steps:
step S1: and sequentially performing ultrasonic treatment on the etched FTO conductive glass in ultrapure water, a cleaning agent, ultrapure water, acetone and isopropanol for 30min, drying by using nitrogen, and performing ultraviolet ozone treatment for 30min to obtain a clean FTO conductive glass substrate.
0.1244 g of nickel acetate tetrahydrate is dissolved in a mixed solvent of 1mL of ethylene glycol and 35. mu.L of ethylenediamine, and stirred at room temperature for 2 hours to obtain a nickel acetate tetrahydrate solution. Preheating a nickel acetate tetrahydrate solution and an FTO conductive glass substrate on a heating plate at 40 ℃ for 5min, dripping 100 mu L of the preheated nickel acetate tetrahydrate solution onto the preheated FTO conductive glass substrate, spin-coating for 70s at the rotating speed of 1000r/min, and annealing the FTO substrate coated with the nickel acetate tetrahydrate solution at 200 ℃ for 30min to obtain a nickel oxide hole transport layer.
Step S2: 0.461g of lead iodide and 0.159g of methylamine iodide are dissolved in a mixed solvent of 550 mu L of N-methyl pyrrolidone (NMP) and 450 mu L of dimethyl formamide (DMF), 0.1mg of coumarin is added as an additive, the mixture is stirred for 15min at 25 ℃ to obtain a coumarin-containing perovskite precursor solution, the coumarin-containing perovskite precursor solution is dripped on a nickel oxide hole transport layer, the nickel oxide hole transport layer is spin-coated for 50s at the rotating speed of 1000r/min, 0.8mL of diethyl ether is dripped on the 30 th s as an anti-solvent, and the nickel oxide hole transport layer coated with the perovskite precursor solution is annealed for 60min at 100 ℃ to obtain a perovskite light absorption layer.
Step S3: 10mg of [6,6] -phenyl-C71-butyric acid methyl ester was dissolved in 1mL of anhydrous chlorobenzene to obtain a chlorobenzene solution of [6,6] -phenyl-C71-butyric acid methyl ester. 50 mu L of chlorobenzene solution of [6,6] -phenyl-C71-methyl butyrate is dripped on the perovskite light-absorbing layer, spin coating is carried out for 20s at the rotating speed of 4000r/min, and the perovskite light-absorbing layer coated with the chlorobenzene solution of [6,6] -phenyl-C71-methyl butyrate is annealed for 1min at the temperature of 90 ℃ to obtain the electron transport layer.
Step S4: 50.2mg of a 50% (w/v) aqueous solution of polyacetylimine was dissolved in 20mL of isopropanol and sonicated for 2min to obtain a solution of polyacetylimine in isopropanol at a mass ratio of 1: 100. Dripping 100 mu L of isopropanol solution of the polyacetimide on the electron transmission layer, spin-coating for 20s at the rotating speed of 1000r/min, and annealing the electron transmission layer coated with the isopropanol solution of the polyacetimide at 90 ℃ for 10min to obtain the electron transmission modification layer.
And evaporating 80nm silver as an electrode on the electron transport layer modification layer obtained by adopting a vacuum thermal evaporation technology, and finally obtaining the coumarin-containing perovskite solar cell.
Example 3
Step S1: and sequentially performing ultrasonic treatment on the etched FTO conductive glass in ultrapure water, a cleaning agent, ultrapure water, acetone and isopropanol for 30min, drying by using nitrogen, and performing ultraviolet ozone treatment for 25min to obtain a clean FTO conductive glass substrate.
0.1244 g of nickel acetate tetrahydrate is dissolved in a mixed solvent of 1mL of ethylene glycol and 35. mu.L of ethylenediamine, and stirred at room temperature for 2 hours to obtain a nickel acetate tetrahydrate solution. Preheating a nickel acetate tetrahydrate solution and an FTO conductive glass substrate on a heating plate at 150 ℃ for 5min, dripping 100 mu L of the preheated nickel acetate tetrahydrate solution onto the preheated FTO conductive glass substrate, spin-coating for 50s at the rotating speed of 3000r/min, and annealing the FTO substrate coated with the nickel acetate tetrahydrate solution at 450 ℃ for 120min to obtain a nickel oxide hole transport layer.
Step S2: 0.461g of lead iodide and 0.159g of methylamine iodide are dissolved in a mixed solvent of 550 mu L of N-methyl pyrrolidone (NMP) and 450 mu L of dimethyl formamide (DMF), 6mg of coumarin is added as an additive, the mixture is stirred for 60min at 70 ℃ to obtain a coumarin-containing perovskite precursor solution, the coumarin-containing perovskite precursor solution is dripped on a nickel oxide hole transport layer, the nickel oxide hole transport layer is spin-coated for 70s at the rotating speed of 3000r/min, 0.1mL of diethyl ether is dripped on the 30 th s as an anti-solvent, and the nickel oxide hole transport layer coated with the perovskite precursor solution is annealed for 10min at 140 ℃ to obtain the perovskite light absorption layer.
Step S3: 18mg of [6,6] -phenyl-C71-butyric acid methyl ester was dissolved in 1mL of anhydrous chlorobenzene to obtain a chlorobenzene solution of [6,6] -phenyl-C71-butyric acid methyl ester. 50 mu L of chlorobenzene solution of [6,6] -phenyl-C71-methyl butyrate is dripped on the perovskite light absorption layer, spin coating is carried out for 50s at the rotating speed of 3000r/min, and the perovskite light absorption layer coated with the chlorobenzene solution of [6,6] -phenyl-C71-methyl butyrate is annealed for 10min at 70 ℃ to obtain the electron transport layer.
Step S4: 50.2mg of a 50% (w/v) aqueous solution of polyacetylimine is dissolved in 20mL of isopropanol and subjected to ultrasonic treatment for 2min to obtain a solution of polyacetylimine in isopropanol with a mass ratio of 1: 500. Dripping 100 mu L of isopropanol solution of the polyacetimide on the electron transport layer, spin-coating for 40s at the rotating speed of 4000r/min, and annealing the electron transport layer coated with the isopropanol solution of the polyacetimide at 100 ℃ for 1min to obtain the electron transport modification layer.
And evaporating 120nm silver as an electrode on the electron transport layer modification layer obtained by adopting a vacuum thermal evaporation technology, and finally obtaining the coumarin-containing perovskite solar cell.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. The coumarin-containing perovskite solar cell is characterized by comprising a conductive substrate, a nickel oxide hole transport layer, a perovskite light absorption layer, an electron transport modification layer and an electrode layer, wherein the perovskite light absorption layer comprises an additive, and the additive comprises coumarin.
2. The coumarin-containing perovskite solar cell of claim 1, wherein the perovskite light absorbing layer is prepared by a method comprising: coumarin is added into the perovskite precursor solution, and the perovskite light absorption layer is prepared by a spin coating method.
3. The coumarin-containing perovskite solar cell of claim 2, wherein the coumarin is added to the perovskite precursor solution in an amount comprising 0.1-6 mg/ml.
4. The coumarin-containing perovskite solar cell of claim 2, wherein the perovskite precursor solution comprises a perovskite material comprising methylamine lead iodide and formamidine lead iodide and a precursor solvent; the precursor solvent includes at least one of N-methylpyrrolidone, dimethylformamide, γ -butyrolactone, and dimethyl sulfoxide.
5. A method of manufacturing a coumarin-containing perovskite solar cell according to any one of claims 1 to 4, comprising the steps of:
step S1: after ultraviolet ozone treatment is carried out on a conductive substrate, coating a tetrahydrate nickel acetate solution on the conductive substrate to obtain a nickel oxide hole transport layer;
step S2: adding coumarin into the perovskite precursor solution, heating and stirring to obtain a coumarin-containing perovskite precursor solution; coating the coumarin-containing perovskite precursor solution on the nickel oxide hole transport layer, and annealing to obtain a perovskite light absorption layer;
step S3: coating [6,6] -phenyl-C71-methyl butyrate solution on the perovskite light absorption layer to obtain an electron transport layer;
step S4: coating a polyimide solution on the electron transport layer to obtain an electron transport modification layer; and adding an electrode layer on the electron transmission modification layer to obtain the coumarin-containing perovskite solar cell.
6. The method for preparing a coumarin-containing perovskite solar cell according to claim 5, wherein in step S1, the concentration of the nickel acetate tetrahydrate solution comprises 0.1-0.5 mol/ml.
7. The method according to claim 5, wherein step S2 further comprises dropping an anti-solvent while coating the coumarin-containing perovskite precursor solution on the nickel oxide hole transport layer.
8. The method for preparing a coumarin-containing perovskite solar cell according to claim 5, wherein in step S2, the heating temperature comprises 25 ℃ to 70 ℃, and the stirring time comprises: 15-60 min.
9. The method for preparing a coumarin-containing perovskite solar cell according to claim 5, wherein in step S3, the concentration of the [6,6] -phenyl-C71-methyl butyrate solution comprises 10-30 mg/ml.
10. The method according to claim 5, wherein in step S4, the polyimide solution comprises a mixture of a polyimide and isopropanol, and the mass ratio of the polyimide to the isopropanol comprises 1: (100-500).
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