CN111129310B - Preparation method of perovskite thin film with introduced capsaicin - Google Patents
Preparation method of perovskite thin film with introduced capsaicin Download PDFInfo
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- CN111129310B CN111129310B CN201911248276.0A CN201911248276A CN111129310B CN 111129310 B CN111129310 B CN 111129310B CN 201911248276 A CN201911248276 A CN 201911248276A CN 111129310 B CN111129310 B CN 111129310B
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Abstract
The invention discloses a method for preparing a perovskite thin film by introducing capsaicin, which is characterized in that the capsaicin is introduced into a perovskite precursor liquid to improve the grain size of the perovskite thin film and passivate defects in the perovskite thin film, and the method comprises the following specific steps: precursor liquid, a PTAA film and a perovskite film. Compared with the prior art, the invention has good film forming quality, the introduced capsaicin can effectively delay the crystallization process of the perovskite, increase the size of perovskite crystal grains and passivate defects in the perovskite, the process is simple, the reaction condition is mild and controllable, the added capsaicin is a renewable biological material, the cost is low, and the invention is particularly suitable for large-scale commercial production.
Description
Technical Field
The invention relates to the technical field of perovskite solar cells, in particular to a perovskite thin film preparation method for improving the size of perovskite grains and passivating defects in perovskite by using capsaicin.
Background
Solar energy is used as a renewable energy source, is clean, environment-friendly, pollution-free, has higher safety guarantee, and is inexhaustible. Solar energy is very important to solve human energy supply and alleviate environmental pollution, and the problem of generating electricity by using solar energy generated by the solar energy is of great significance. Among the numerous solar cells, organic-inorganic hybrid perovskite solar cells are one of the most promising photovoltaic technologies today. The organic-inorganic hybrid perovskite has lower exciton confinement energy and carrier diffusion length and higher absorption coefficient, is an excellent material for manufacturing photoelectric devices, and the perovskite solar cell has the advantages of low cost, simple preparation, large-area preparation, application to flexible devices and the like, and has wide application prospect. As one of the hot topics in the scientific community in recent years, the research on organic-inorganic hybrid perovskite solar cells is more and more numerous, and the rapid iteration of related devices raises another new wave of utilizing renewable energy. Researchers put great efforts into perovskite material design, device structure optimization and packaging technology updating, from 2009 perovskite solar cells are reported for the first time, the efficiency of the perovskite solar cells reaches 10% in 2012, and then only five years are used, so that the efficiency of the perovskite solar cells reaches about 20%. Recent data has shown that researchers have increased the energy conversion efficiency of perovskite solar cells to 25%, keeping up with the approved 26% efficiency of crystalline silicon solar cells.
According to the perovskite thin film preparation method in the prior art, due to the soft material characteristics of the perovskite thin film and the volatility of organic components of the perovskite thin film, defects are easily generated at perovskite crystal boundaries and on the surface, the defects can cause the recombination of current carriers and limit the efficiency of a perovskite solar cell, the defects are more sensitive to temperature, humidity, oxygen and the like, the degradation of the perovskite thin film is accelerated, the stability of a device is reduced, and the perovskite thin film preparation method becomes the largest stumbling stone on the current commercial road. Therefore, the preparation of high-quality perovskite thin films with large grain size and low defect state is the key to obtain high-efficiency stable perovskite solar cells.
Disclosure of Invention
The invention aims to provide a method for preparing a perovskite thin film by introducing capsaicin, which aims at overcoming the defects of the prior art, delays the crystallization process of the perovskite by introducing the capsaicin, increases the grain size of the perovskite, passivates the defects in the perovskite, greatly improves the film forming quality of the perovskite, and is low in cost, green, environment-friendly, simple in process, mild and controllable in condition and suitable for large-scale commercial production, and the introduced capsaicin is a renewable biological material.
The specific technical scheme for realizing the purpose of the invention is as follows: a method for preparing perovskite film of leading-in capsaicin, it features to lead-in capsaicin in the precursor liquid of perovskite, in order to improve the grain size of the perovskite film and passivate the defect in the perovskite film, prepare including the following steps specifically:
a, step a: preparation of perovskite precursor liquid
Dissolving lead iodide and iodomethylamine in mixed solution of N, N-dimethylformamide and dimethyl sulfoxide, adding capsaicin, mixing and dissolving at 60 deg.C to obtain perovskite (CH) 3 NH 3 PbI 3 ) The precursor solution is specifically prepared by the following steps: weighing lead iodide and iodomethylamine at a molar ratio of 1.0mol to 0.4-1.2 mol, adding the lead iodide and the iodomethylamine into a mixed solvent of N, N-dimethylformamide and dimethyl sulfoxide at a volume ratio of 1.1-0.5, introducing capsaicin at a mass ratio of 0.01-0.1 wt%, and fully dissolving to prepare perovskite precursor solutions with different doping ratios.
b, step (b): preparation of a PTAA film
Dissolving the PTAA and the F4TCNQ in a chlorobenzene solvent according to a mass ratio of 1.0 to 0.1 to 0.5, dissolving at 60 ℃, preparing a chlorobenzene solution with the PTAA content of 2mg/ml as a spin-coating solution, filtering, spin-coating the spin-coating solution on a conductive glass substrate (ITO), and annealing at 150 ℃ for 10 minutes to obtain the PTAA film on the conductive glass substrate, wherein the spin-coating time is 20 to 50 seconds, and the spin-coating speed is 5000 revolutions per second.
c, step (c): preparation of perovskite thin film
And dropwise adding the prepared precursor solution on a PTAA film, carrying out spin coating for 30 seconds at the rotating speed of 4000 rpm, dropwise adding 150 microliters of chlorobenzene after 4-10 seconds from the start of the spin coating, and then annealing at the temperature of 100 ℃ for 10 minutes to obtain the perovskite film.
Compared with the prior art, the invention has good film forming quality, the introduced capsaicin can effectively delay the crystallization process of the perovskite, increase the size of perovskite crystal grains and passivate defects in the perovskite, the process is simple, the reaction condition is mild and controllable, the added capsaicin is a renewable biological material, the cost is low, and the invention is particularly suitable for large-scale commercial production.
Drawings
FIG. 1 is a scanning electron micrograph of a perovskite thin film prepared in example 1;
FIG. 2 is a scanning electron micrograph of the perovskite thin film prepared in example 3;
FIG. 3 is the absorption spectra of perovskite thin films prepared in examples 1 and 3;
FIG. 4 shows fluorescence spectra of perovskite thin films prepared in examples 1 and 3.
Detailed Description
The present invention is further illustrated by the following specific examples.
Example 1
Preparation of (I) PTAA film
And (2) mixing the components in a mass ratio of 4: dissolving PTAA and F4TCNQ of 1 in chlorobenzene, dissolving at 60 ℃, preparing a chlorobenzene solution with the PTAA content of 2mg/ml as a spin-coating solution, heating at 60 ℃ to dissolve, filtering to obtain the spin-coating solution, dripping the spin-coating solution on a conductive glass substrate (ITO), spin-coating for 30 seconds at the rotating speed of 5000 r/s, then placing on a heating table at 150 ℃, annealing for 10 minutes to obtain a PTAA film, and spin-coating a DMF solvent to improve the wettability.
Preparation of perovskite precursor
Weighing 1.08 mol of lead iodide and 1 mol of iodomethylamine, dissolving in 750 microliters of N, N-dimethylformamide and 85 microliters of dimethyl sulfoxide mixed solvent, and fully dissolving to form a precursor solution.
Preparation of (tri) perovskite thin film
Dropwise adding the perovskite precursor solution on the PTAA film, carrying out spin coating for 30 seconds at the rotating speed of 4000 revolutions per second, dropwise adding 150 microliter chlorobenzene after 7 seconds from the start of the spin coating, and then placing on a heating table at 100 ℃ for annealing for 10 minutes to obtain the perovskite film.
Referring to fig. 1, the perovskite thin film prepared above is characterized by electronic scanning, and the perovskite thin film is relatively flat and has a smaller grain size.
Referring to fig. 3, the perovskite thin film prepared as described above is found to have a weak absorption strength through spectral absorption due to the small grain size of the perovskite thin film.
Referring to fig. 4, the perovskite thin film prepared in the above way is found to have weak fluorescence intensity through fluorescence spectrum absorption, which indicates that a great number of defects exist in the perovskite thin film.
Example 2
Preparation of (I) PTAA film
The same as in example 1.
Preparation of perovskite precursor
Weighing 1.08 mol of lead iodide and 1 mol of iodomethylamine, dissolving in a mixed solvent of 750 microliters of N, N-dimethylformamide and 85 microliters of dimethyl sulfoxide, adding 0.01wt% of capsaicin, and fully dissolving to form a precursor solution.
Preparation of (tri) perovskite thin film
The same as in example 1.
Example 3
Preparation of (I) PTAA film
The same as in example 1.
Preparation of (di) perovskite precursor
Weighing 1.08 mol of lead iodide and 1 mol of iodomethylamine, dissolving in 750 microliters of N, N-dimethylformamide and 85 microliters of dimethyl sulfoxide mixed solvent, adding capsaicin with the mass ratio of 0.1wt%, and fully dissolving to form precursor solution.
Preparation of (tri) perovskite thin film
The same as in example 1.
Referring to the attached figure 2, the perovskite thin film prepared by the method is characterized by electronic scanning, the perovskite thin film is flat and compact, and the grain size is remarkably increased, which shows that the introduced capsaicin can effectively improve the size of the perovskite grains.
Referring to fig. 3, the perovskite thin film prepared above is found through spectral absorption, and the absorption intensity is also obviously improved after capsaicin is introduced, and is consistent with the enlargement of the grain size.
Referring to the attached figure 4, the fluorescence spectrum absorption of the prepared perovskite thin film shows that the fluorescence intensity is obviously enhanced after capsaicin is introduced, and the defect in the perovskite thin film is effectively passivated.
Example 4
Preparation of (I) PTAA film
The same as in example 1.
Preparation of perovskite precursor
Weighing 1.08 mol of lead iodide and 1 mol of iodomethylamine, dissolving in 750 microliters of N, N-dimethylformamide and 85 microliters of dimethyl sulfoxide mixed solvent, adding capsaicin with the mass ratio of 0.5wt%, and fully dissolving to form precursor solution.
Preparation of (tri) perovskite thin film
The same as in example 1.
The above embodiments are only for further illustration of the present invention and are not intended to limit the present invention, and all equivalent implementations of the present invention should be included in the scope of the claims of the present invention.
Claims (1)
1. A method for preparing perovskite thin film introduced with capsaicin is characterized in that capsaicin is introduced into perovskite precursor liquid to improve the film forming quality of the perovskite thin film, and the method specifically comprises the following steps:
a, step a: preparation of precursor solution
Dissolving lead iodide and iodomethylamine in a mixed solution of N, N-dimethylformamide and dimethyl sulfoxide, adding capsaicin, mixing and dissolving at 60 ℃ to prepare a perovskite precursor solution, wherein the molar volume ratio of the lead iodide to the iodomethylamine to the N, N-dimethylformamide to the dimethyl sulfoxide is as follows: 1.0mol;
b, step (b): preparation of a PTAA film
Dissolving PTAA and F4TCNQ in chlorobenzene solvent according to the mass ratio of 1.0-0.1, dissolving at 60 ℃ to prepare chlorobenzene solution with 2mg/ml of PTAA content as spin-coating liquid, filtering, spin-coating the spin-coating liquid on a conductive glass substrate, and annealing at 150 ℃ for 10 minutes to obtain a PTAA film on the conductive glass substrate, wherein the spin-coating time is 20-50 seconds, and the spin-coating speed is 5000 revolutions per second;
c, step (c): preparation of perovskite thin film
And dropwise adding the prepared precursor solution on a PTAA thin film, spin-coating for 30 seconds at the rotating speed of 4000 revolutions per second, dropwise adding 150 microliters of chlorobenzene after 4-10 seconds from the start of spin-coating, and annealing at the temperature of 100 ℃ for 10 minutes to obtain the capsaicin-introduced perovskite thin film.
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| CN116004229B (en) * | 2023-01-04 | 2023-12-05 | 吉林大学 | Chlorophyll-modified CsPbCl3: yb3+ perovskite film and preparation method and application thereof |
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| CN106953016B (en) * | 2017-04-07 | 2018-05-04 | 中国科学院重庆绿色智能技术研究院 | A kind of perovskite solar cell of ion doping |
| WO2019017843A1 (en) * | 2017-07-18 | 2019-01-24 | Nanyang Technological University | Composite film and method of forming the same |
| CN108232014B (en) * | 2017-12-30 | 2020-11-10 | 杭州纤纳光电科技有限公司 | Ion stabilizer doped perovskite thin film and preparation method and application thereof |
| CN108258128B (en) * | 2018-01-17 | 2020-09-04 | 杭州纤纳光电科技有限公司 | Perovskite solar cell with interface modification layer and preparation method thereof |
| CN108987584A (en) * | 2018-08-27 | 2018-12-11 | 湖北大学 | Perovskite solar battery and preparation method thereof |
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| CN110085743A (en) * | 2019-03-15 | 2019-08-02 | 北京宏泰创新科技有限公司 | It is a kind of using two sulphur ene compounds as the solar battery of calcium titanium ore bed passivating material and preparation method |
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| CN107887511A (en) * | 2017-11-22 | 2018-04-06 | 苏州大学 | A kind of method that perovskite solar cell is prepared based on two-dimensional material graphene phase carbon nitride |
| CN109461821A (en) * | 2018-10-15 | 2019-03-12 | 北京曜能科技有限公司 | A kind of preparation method of hybrid inorganic-organic perovskite thin film |
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