CN114242902A - Method for improving air stability of trans-form all-inorganic perovskite solar cell based on ionic liquid - Google Patents

Method for improving air stability of trans-form all-inorganic perovskite solar cell based on ionic liquid Download PDF

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CN114242902A
CN114242902A CN202111429921.6A CN202111429921A CN114242902A CN 114242902 A CN114242902 A CN 114242902A CN 202111429921 A CN202111429921 A CN 202111429921A CN 114242902 A CN114242902 A CN 114242902A
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solar cell
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layer
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王昆
曹黎
佟宇
霍江伟
李天翔
王洪强
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Northwestern Polytechnical University
Shenzhen Institute of Northwestern Polytechnical University
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Shenzhen Institute of Northwestern Polytechnical University
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    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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Abstract

The invention relates to a method for improving air stability of a trans-form all-inorganic perovskite solar cell based on ionic liquid, which comprises an ITO layer, a hole transport layer, a perovskite absorption layer, an ionic liquid layer, an electron transport layer, a buffer layer and a metal electrode in sequence from bottom to top; imidazole ionic liquid is added into the perovskite precursor solution; the whole preparation process is carried out in the air, and the experimental humidity condition is 30-55%. The stability of the optimized perovskite thin film in the air is improved, and meanwhile, the performance of the trans-perovskite solar cell is improved: the open-circuit voltage is 0.94V and the short-circuit current is 15.57mA cm‑2The fill factor was 71.43%, and the photoelectric conversion efficiency was 10.43%. The photoelectric conversion efficiency is still kept at 92% after 1680 h.

Description

Method for improving air stability of trans-form all-inorganic perovskite solar cell based on ionic liquid
Technical Field
The invention belongs to the technical field of photoelectron materials, and relates to a method for improving air stability of a trans-form all-inorganic perovskite solar cell based on ionic liquid.
Background
Metal halide perovskite solar cells have made significant progress since 2009, and are considered to be the most promising new generation photovoltaic cells. Compared with perovskite solar cells prepared in glove boxes, preparation in air can effectively reduce the manufacturing cost, and therefore, more and more attention is paid. At present, the efficiency of the organic-inorganic hybrid perovskite solar cell prepared in the air can almost be compared with that of the perovskite solar cell prepared in a glove box nitrogen environment. However, the organic cation is volatile, resulting in poor thermal stability. In contrast, the all-inorganic perovskite CsPbI3The perovskite solar cell has excellent thermal stability and photoelectric stability, and becomes a research hotspot of perovskite solar cells. However, all-inorganic perovskites are susceptible to phase change, and particularly in an air environment, moisture induces and accelerates the phase change process thereof, which severely limits all-inorganic perovskites CsPbI3The commercialization of solar cells has progressed.
To inhibit CsPbI3The phase change of the organic perovskite solar cell is improved, the performance of the organic perovskite solar cell prepared in the air environment is improved, and scientific research personnel do a great deal of work and adopt methods such as additive engineering, precursor engineering, surface treatment, ion substitution and the like. The preparation in the air can be realized through a series of regulation and control technologies, however, the air stability of the all-inorganic perovskite is still poor, and the normal formal structure is mainly relied on. The photoelectric conversion efficiency of the trans-structure at high humidity (45-55%) reported at present is only 7.3%, and a more effective technical method is still needed to improve the performance of preparing the trans-all-inorganic perovskite solar cell in air, especially at high humidity.
The currently reported all-inorganic CsPbI prepared in air3Perovskite solar cells mostly adopt a conventional formal (n-i-p) structure. Seok et al formally structured photovoltaics prepared in air by treating the perovskite surface using surface engineeringThe device obtains 20.37% photoelectric conversion efficiency, which is the highest efficiency reported at present for preparing all-inorganic perovskite in Air [ S.M.Yoon, H.Min, J.B.Kim, G.Kim, K.S.Lee, and S.II Seok, Surface Engineering of organic-Air-Processed center Lead Layers for Efficient Solar Cells, Joule 2021,5,183]. In addition, the currently reported all-inorganic solar cells with high photoelectric conversion efficiency are generally based on formal structures [ x.chang, j.fang, y.fan, t.luo, h.su, y.zhang, j.lu, l.tsetseris, t.d.anthopoulos, S. (F.) Liu, and k.zhao, Printable CsPbI3 Perovskite Solar Cells with PCE of 19％via an Additive Strategy,Adv.Mater.2020,32,2001243；K.Wang,C.Gao,Z.Xu,Q.Tian,X.Gu,L.Zhang,S.Zhang,K.Zhao,and S.(F.)Liu,In-Situ Hot Oxygen Cleansing and Passivation for All-Inorganic Perovskite Solar Cells Deposited in Ambient to Breakthrough 19％Efficiency,Adv.Funct.Mater.2021,31,210156]However, it is generally required to dope the hole transport material spiro-OMeTAD with lithium salt or the like to increase its hole mobility, however, these dopants are reported to decrease device stability. Compared with formal structure, the trans-p-i-n structure transmission layer does not need dopant, has higher stability and simple preparation process, but the research is still lagged behind that of formal CsPbI at present3Perovskite cell structures, particularly in air fabrication. Therefore, the preparation of stable trans-CsPbI in air is sought3Perovskite solar cell methods are currently an urgent problem to be solved in the art.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a method for improving the air stability of a trans-form all-inorganic perovskite solar cell based on ionic liquid, and aims to provide a method for improving the air stability of a trans-form all-inorganic perovskite solar cell based on ionic liquid modification of a perovskite phase and an interface, so that the stability of the trans-form all-inorganic perovskite solar cell is improved from the two aspects of preparation and storage, the manufacturing cost is reduced, and the performance of a photovoltaic device is improved so as to promote the industrialization of the perovskite solar cell.
Technical scheme
A method for improving air stability of a trans-form all-inorganic perovskite solar cell based on ionic liquid is characterized by comprising the following steps: the structure comprises an ITO layer, a hole transport layer, a perovskite absorption layer, an ionic liquid layer, an electron transport layer, a buffer layer and a metal electrode from bottom to top in sequence; imidazole ionic liquid is added into the perovskite precursor solution; the whole preparation process is carried out in the air, the experimental humidity condition is 30-55%, and the steps are as follows:
step 1, preparing an ionic liquid modified perovskite precursor solution:
ionic liquid modified perovskite precursor solution: 0.6-0.8 mol/L CsPbI3Adding 0.05-0.7% of imidazole ionic liquid into the DMF solution, and uniformly mixing to obtain the product;
step 2: cleaning ITO conductive glass to be used as a transparent electrode;
and step 3: PSS, and then annealing to prepare a hole transport layer;
and 4, step 4: preheating the substrate prepared in the step (3) at 60-100 ℃ for 3-5 min, then spin-coating the ionic liquid modified perovskite precursor solution in the step (1) on the surface of the hole transport layer by a two-step spin coating method, then carrying out heat treatment at 60 ℃ for 5min and at 160 ℃ for 4-5 min, and obtaining a perovskite absorption layer on the surface of the hole transport layer;
and 5: coating anisole solution of imidazole ionic liquid on the surface of the perovskite absorption layer in a spinning mode, and then annealing to prepare an ionic liquid layer;
the anisole solution of the imidazole ionic liquid is 1-7 mg/mL of anisole solution of the imidazole ionic liquid;
step 6: spin-coating a chlorobenzene solution of PCBM on the surface of the ionic liquid layer to prepare an electron transmission layer;
the chlorobenzene solution of the PCBM is 10-20 mg/mL of the chlorobenzene solution of the PCBM;
and 7: spin-coating an isopropanol solution of BCP on the surface of the electron transport layer to prepare a buffer layer;
the isopropanol solution of BCP is 0.3-1 mg/mL of the isopropanol solution of BCP;
and 8: and evaporating a metal electrode Ag on the buffer layer to obtain the perovskite solar cell.
The cleaning in the step 2 comprises the steps of sequentially cleaning the detergent, distilled water, ethanol, acetone and isopropanol, drying the mixture by using nitrogen, and then using O to dry the mixture2And (4) carrying out plasma treatment.
The plasma treatment time is 10-15 min.
And 3, spin coating PEDOT in the step 3, wherein the rotation speed of PSS is 4000-6000 revolutions per minute, the spin coating time is 30 seconds, and then annealing is carried out for 10-20 min at 150 ℃.
The two-step spin coating method in the step 4 comprises the following steps: spin coating at 1000 rpm for 10 seconds and then at 4000 rpm for 30 seconds.
The imidazole ionic liquids include, but are not limited to: 1-butyl-3-methylimidazolium hexafluorophosphate BMIMPF61-allyl-3-methylimidazolium tetrafluoroborate AMIMBF41-butyl-3-methylimidazolium tetrafluoroborate BMIMBF41-butyl-3-methylimidazolium bromide salt BMIMBr or 1-butyl-3-methylimidazolium iodide salt BMIMI.
In the step 5, an anisole solution of the imidazole ionic liquid is spin-coated, the rotation speed is 5000-9000 revolutions per minute, the spin-coating time is 30 seconds, and then the thermal treatment is carried out for 10-15 min at 100 ℃.
And 6, spin-coating PCBM chlorobenzene solution at the rotation speed of 1000-2000 revolutions per minute for 30 seconds, and then carrying out heat treatment at 70 ℃ for 10-15 min.
And (3) carrying out heat treatment on the isopropanol solution of BCP in the step (7) at the rotation speed of 4000-6000 revolutions per minute for 30 seconds after spin coating for 10-15 min at 70 ℃.
The thickness of the metal electrode Ag in the step 8 is 70-100 nm.
Advantageous effects
The invention provides a method for improving air stability of a trans-form all-inorganic perovskite solar cell based on ionic liquid, which comprises the following steps of sequentially forming an ITO layer, a hole transport layer, a perovskite absorption layer, an ionic liquid layer, an electron transport layer, a buffer layer and a metal electrode from bottom to top in a structure; imidazole ionic liquid is added into the perovskite precursor solution; the whole preparation process is carried out in the air, and the experimental humidity condition is 30-55%.
The invention has the beneficial effects that:
(1) according to the invention, imidazole ionic liquid is introduced into a conventional perovskite precursor solution as an additive, which can be used as a crystal nucleus, and the Ostward curing effect is utilized to regulate and control the crystallization process of a perovskite film, so that the appearance of the film is effectively regulated and controlled, the size of crystal grains is increased, the number of crystal boundaries and pinholes is reduced, and the carrier recombination is remarkably reduced; due to the interaction of the ionic liquid and the inorganic perovskite, the ionic liquid is mainly gathered at the crystal boundary of the bulk phase thin film, the effect of passivating the defects of the crystal boundary is further achieved, meanwhile, the gathering of the hydrophobic groups at the crystal boundary effectively prevents the phase change caused by the intrusion of moisture, and the stability of the all-inorganic perovskite structure is improved. The stability of the optimized perovskite thin film in the air is improved, and meanwhile, the performance of the trans-perovskite solar cell is improved: the open-circuit voltage is 0.91V and the short-circuit current is 17.17mA cm-2The fill factor was 70.13%, and the photoelectric conversion efficiency was 10.92%.
(2) According to the invention, on the basis of a conventional perovskite film, the surface treatment is carried out on the perovskite film by using the imidazole ionic liquid, and due to the interaction between the ionic liquid and the perovskite, the interface defect between the perovskite and an electron transmission layer is passivated, so that the non-radiative recombination is remarkably reduced, and the charge transmission is promoted; meanwhile, due to the uniform coverage of the ionic liquid at the interface, dipoles at the interface are formed, so that charge transmission is effectively promoted, and the open-circuit voltage loss of the interface is reduced; the ordered arrangement of the hydrophobic groups on the surface of the perovskite enables the surface of the perovskite to form a protective layer, so that the damage of moisture to the perovskite structure is further inhibited, and the stability of the perovskite structure is further improved. The stability of the optimized perovskite thin film in the air is obviously improved, and meanwhile, the performance of the trans-perovskite solar cell is improved: the open-circuit voltage is 0.94V and the short-circuit current is 15.57mA cm-2The fill factor was 71.43%, and the photoelectric conversion efficiency was 10.43%.
(3) Based on the conventional perovskite film, the invention simultaneously treats the perovskite film bulk phase and the surface by using imidazole ionic liquid, and uses the effects (1) and (2)Due to the double effects, the interface charge transmission performance is optimized while the quality of the perovskite bulk phase thin film is improved, and the stability of perovskite is improved, so that the performances of the perovskite thin film and the corresponding trans-form photovoltaic device are further improved. The regulation and control method is simple, the used ionic liquid is low in price, the prepared trans-form photovoltaic device is carried out in the air environment in the whole process, the required annealing temperature is low, and no additional additive is needed in the transmission layer. The stability of the optimized perovskite thin film in the air is further improved, the perovskite thin film has good moisture resistance, and meanwhile, the performance of the trans-perovskite solar cell is improved: the open-circuit voltage is 0.95V and the short-circuit current is 19.39mA cm-2The filling factor is 71.57%, the photoelectric conversion efficiency is 13.21%, and the photoelectric conversion efficiency is still kept at 92% after 1680 h.
Drawings
FIG. 1 is a comparative XRD image of perovskite thin films before and after modification.
FIG. 2 is the contact angle of the perovskite thin film before and after modification.
FIG. 3 is an SEM image of perovskite thin films before and after modification at different magnifications: a, b) a control film; c, d) modifying the perovskite phase thin film by the ionic liquid; e, f) ionic liquid is used for modifying perovskite phase and surface thin films.
FIG. 4 is a photograph of perovskite thin films after modification and after modification, which were left in air for various periods of time.
Fig. 5 is a result of a placement stability test of the perovskite solar cell obtained in example 1 and example 4 of the present invention.
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
example 1
The embodiment is a preparation method of a standard device, the whole preparation process is carried out in air, the experimental humidity condition is 30% -55%, and the experiment comprises the following steps:
s1: cleaning ITO conductive glass, sequentially washing with a detergent, distilled water, ethanol, acetone and isopropanol in sequence, blow-drying with nitrogen, and then blowing with O2Plasma treatment is carried out for 15 min.
S2: dropping PEDOT (PSS) on ITO conductive glass, spin-coating to form a film by using a spin coater at the rotation speed of 4000 revolutions per minute for 30 seconds, and then annealing at 150 ℃ for 15 min;
s3: weighing 208mg of CsI and 471mg of HPbI according to an equimolar ratio3Completely dissolving it in 1ml of DMF and stirring at room temperature for 3 hours;
s4: preheating the substrate prepared in the step S2 at 60 ℃ for 5min, then dripping the perovskite precursor solution prepared in the step S3 on the hole transport layer prepared in the step S2, spin-coating the solution to form a film by using a spin coater, spin-coating the film for 10 seconds at the rotating speed of 1000 revolutions per minute, spin-coating the film for 30 seconds at the rotating speed of 4000 revolutions per minute, carrying out heat treatment at 60 ℃ for 5min, and then carrying out heat treatment at 160 ℃ for 4min to obtain a perovskite absorption layer;
s5: dissolving PCBM in chlorobenzene to prepare a solution of 20 mg/mL;
s6: dripping the solution prepared in the step S5 on the perovskite absorption layer prepared in the step S4, performing spin coating on the solution by using a spin coater to form a film, wherein the rotating speed is 2000 revolutions per minute, the spin coating time is 30 seconds, and then performing heat treatment at 70 ℃ for 10min to obtain an electron transport layer;
s7: BCP is dissolved in isopropanol to prepare a solution of 0.3 mg/mL;
s8: dripping the solution prepared in the step S7 on the perovskite absorption layer prepared in the step S6, performing spin coating on the solution by using a spin coater to form a film, wherein the rotating speed is 5000 revolutions per minute, the spin coating time is 30 seconds, and then performing heat treatment at 70 ℃ for 10min to obtain a buffer layer;
s9: and (4) evaporating 100nm of metal electrode Ag on the buffer layer prepared in the step S8 by adopting a vacuum evaporation technology to prepare the perovskite solar cell, which is recorded as a w/o cell.
The open-circuit voltage of the trans-form all-inorganic perovskite solar cell is 0.92V, and the short-circuit current is 13.81mA cm-2The fill factor is 67.87%, the photoelectric conversion efficiency is 8.64%, and the photoelectric conversion efficiency is still maintained at 82% after 648 h.
Example 2
The embodiment is a method for preparing a trans-form all-inorganic perovskite solar cell by modifying a perovskite phase with an ionic liquid, the whole preparation process is carried out in the air, the experimental humidity condition is 30% -55%, and the experiment comprises the following steps:
s1: cleaning ITO conductive glass, sequentially washing with a detergent, distilled water, ethanol, acetone and isopropanol in sequence, blow-drying with nitrogen, and then blowing with O2Performing plasma treatment for 15 min;
s2: dropping PEDOT (PSS) on ITO conductive glass, spin-coating to form a film by using a spin coater at the rotation speed of 4000 revolutions per minute for 30 seconds, and then annealing at 150 ℃ for 15 min;
s3: weighing 208mg of CsI and 471mg of HPbI according to an equimolar ratio3Completely dissolving the imidazole in 1ml of DMF, adding 0.3 percent (mol ratio) of imidazole ionic liquid into the solution, and stirring the solution at room temperature for 3 hours;
s4: preheating the substrate prepared in the step S2 at 60 ℃ for 5min, then dripping the perovskite precursor solution prepared in the step S3 on the hole transport layer prepared in the step S2, spin-coating the solution to form a film by using a spin coater, spin-coating the film for 10 seconds at the rotating speed of 1000 revolutions per minute, spin-coating the film for 30 seconds at the rotating speed of 4000 revolutions per minute, carrying out heat treatment at 60 ℃ for 5min, and then carrying out heat treatment at 160 ℃ for 4min to obtain a perovskite absorption layer;
s5: dissolving PCBM in chlorobenzene to prepare a solution of 20 mg/mL;
s6: dripping the solution prepared in the step S5 on the perovskite absorption layer prepared in the step S4, performing spin coating on the solution by using a spin coater to form a film, wherein the rotating speed is 2000 revolutions per minute, the spin coating time is 30 seconds, and then performing heat treatment at 70 ℃ for 10min to obtain an electron transport layer;
s7: BCP is dissolved in isopropanol to prepare a solution of 0.3 mg/mL;
s8: dripping the solution prepared in the step S7 on the electron transmission layer prepared in the step S6, performing spin coating by using a spin coater to form a film, wherein the rotating speed is 5000 revolutions per minute, the spin coating time is 30 seconds, and then performing heat treatment at 70 ℃ for 10min to obtain a buffer layer;
s9: and (4) evaporating 100nm of metal electrode Ag on the buffer layer prepared in the step S8 by adopting a vacuum evaporation technology to prepare the perovskite solar cell which is called as a w-bulk cell.
The optimized perovskite thin film is in airThe medium stability is improved, and meanwhile, the performance of the trans-perovskite solar cell is improved: the open-circuit voltage is 0.91V and the short-circuit current is 17.17mA cm-2The fill factor was 70.13%, and the photoelectric conversion efficiency was 10.92%.
Example 3
The embodiment is a method for preparing a trans-form all-inorganic perovskite solar cell by modifying a perovskite interface with ionic liquid, the whole preparation process is carried out in the air, the experimental humidity condition is 30% -55%, and the experiment comprises the following steps:
s1: cleaning ITO conductive glass, sequentially washing with a detergent, distilled water, ethanol, acetone and isopropanol in sequence, blow-drying with nitrogen, and then blowing with O2Performing plasma treatment for 15 min;
s2: dropping PEDOT (PSS) on ITO conductive glass, spin-coating to form a film by using a spin coater at the rotation speed of 4000 revolutions per minute for 30 seconds, and then annealing at 150 ℃ for 15 min;
s3: weighing 208mg of CsI and 471mg of HPbI according to an equimolar ratio3Completely dissolving it in 1ml of DMF and stirring at room temperature for 3 hours;
s4: preheating the substrate prepared in the step S2 at 60 ℃ for 5min, then dripping the perovskite precursor solution prepared in the step S3 on the hole transport layer prepared in the step S2, spin-coating the solution to form a film by using a spin coater, spin-coating the film for 10 seconds at the rotating speed of 1000 revolutions per minute, spin-coating the film for 30 seconds at the rotating speed of 4000 revolutions per minute, carrying out heat treatment at 60 ℃ for 5min, and then carrying out heat treatment at 160 ℃ for 4min to obtain a perovskite absorption layer;
s5: imidazole ionic liquid is dissolved in anisole to prepare a solution of 3 mg/mL;
s6: dripping the solution prepared in the step S5 on the perovskite thin film prepared in the step S4, performing spin coating on the solution by using a spin coater to form a film, wherein the rotating speed is 9000 revolutions per minute, the spin coating time is 30 seconds, and then performing heat treatment at 100 ℃ for 10min to obtain an ionic liquid layer;
s7: dissolving PCBM in chlorobenzene to prepare a solution of 20 mg/mL;
s8: dripping the solution prepared in the step S7 on the ionic liquid layer prepared in the step S6, spin-coating the solution by using a spin coater to form a film, wherein the rotating speed is 2000 revolutions per minute, the spin-coating time is 30 seconds, and then, carrying out heat treatment at 70 ℃ for 10min to obtain an electron transmission layer;
s9: BCP is dissolved in isopropanol to prepare a solution of 0.3 mg/mL;
s10: dripping the solution prepared in the step S9 on the electron transmission layer prepared in the step S8, performing spin coating by using a spin coater to form a film, wherein the rotating speed is 5000 revolutions per minute, the spin coating time is 30 seconds, and then performing heat treatment at 70 ℃ for 10min to obtain a buffer layer;
s11: and (4) evaporating 100nm of metal electrode Ag on the buffer layer prepared in the step S10 by adopting a vacuum evaporation technology to prepare the perovskite solar cell which is recorded as a w-inter cell.
The stability of the optimized perovskite thin film in the air is obviously improved, and meanwhile, the performance of the trans-perovskite solar cell is improved: the open-circuit voltage is 0.94V and the short-circuit current is 15.57mA cm-2The fill factor was 71.43%, and the photoelectric conversion efficiency was 10.43%.
Example 4
The embodiment is a method for preparing a trans-form all-inorganic perovskite solar cell by modifying a perovskite bulk phase and an interface with an ionic liquid, the whole preparation process is carried out in air, the experimental humidity condition is 30% -55%, and the experiment comprises the following steps:
s1: cleaning ITO conductive glass, sequentially washing with a detergent, distilled water, ethanol, acetone and isopropanol in sequence, blow-drying with nitrogen, and then blowing with O2Performing plasma treatment for 15 min;
s2: dropping PEDOT (PSS) on ITO conductive glass, spin-coating to form a film by using a spin coater at the rotation speed of 4000 revolutions per minute for 30 seconds, and then annealing at 150 ℃ for 15 min;
s3: weighing 208mg of CsI and 471mg of HPbI according to an equimolar ratio3Completely dissolving the imidazole in 1ml of DMF, adding 0.3 percent (mol ratio) of imidazole ionic liquid into the solution, and stirring the solution at room temperature for 3 hours;
s4: preheating the substrate prepared in the step S2 at 60 ℃ for 5min, then dripping the perovskite precursor solution prepared in the step S3 on the hole transport layer prepared in the step S2, spin-coating the solution to form a film by using a spin coater, spin-coating the film for 10 seconds at the rotating speed of 1000 revolutions per minute, spin-coating the film for 30 seconds at the rotating speed of 4000 revolutions per minute, carrying out heat treatment at 60 ℃ for 5min, and then carrying out heat treatment at 160 ℃ for 4min to obtain a perovskite absorption layer;
s5: imidazole ionic liquid is dissolved in anisole to prepare a solution of 3 mg/mL;
s6: dripping the solution prepared in the step S5 on the perovskite thin film prepared in the step S4, performing spin coating on the solution by using a spin coater to form a film, wherein the rotating speed is 9000 revolutions per minute, the spin coating time is 30 seconds, and then performing heat treatment at 100 ℃ for 10min to obtain an ionic liquid layer;
s7: dissolving PCBM in chlorobenzene to prepare a solution of 20 mg/mL;
s8: dripping the solution prepared in the step S7 on the ionic liquid layer prepared in the step S6, spin-coating the solution by using a spin coater to form a film, wherein the rotating speed is 2000 revolutions per minute, the spin-coating time is 30 seconds, and then, carrying out heat treatment at 70 ℃ for 10min to obtain an electron transmission layer;
s9: BCP is dissolved in isopropanol to prepare a solution of 0.3 mg/mL;
s10: dripping the solution prepared in the step S9 on the electron transmission layer prepared in the step S8, performing spin coating by using a spin coater to form a film, wherein the rotating speed is 5000 revolutions per minute, the spin coating time is 30 seconds, and then performing heat treatment at 70 ℃ for 10min to obtain a buffer layer;
s11: and (4) evaporating 100nm of metal electrode Ag on the buffer layer prepared in the step S10 by adopting a vacuum evaporation technology to prepare the perovskite solar cell, which is recorded as a w-dual cell.
The optimized trans-form all-inorganic perovskite solar cell has the open-circuit voltage of 0.95V and the short-circuit current of 19.39mA cm-2The filling factor is 71.57%, the photoelectric conversion efficiency is 13.21%, and the photoelectric conversion efficiency is still kept at 92% after 1680 h.
The above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention; and such modifications and substitutions fall within the scope of the present invention.

Claims (10)

1. A method for improving air stability of a trans-form all-inorganic perovskite solar cell based on ionic liquid is characterized by comprising the following steps: the structure comprises an ITO layer, a hole transport layer, a perovskite absorption layer, an ionic liquid layer, an electron transport layer, a buffer layer and a metal electrode from bottom to top in sequence; imidazole ionic liquid is added into the perovskite precursor solution; the whole preparation process is carried out in the air, the experimental humidity condition is 30-55%, and the steps are as follows:
step 1, preparing an ionic liquid modified perovskite precursor solution:
ionic liquid modified perovskite precursor solution: 0.6-0.8 mol/L CsPbI3Adding 0.05-0.7% of imidazole ionic liquid into the DMF solution, and uniformly mixing to obtain the product;
step 2: cleaning ITO conductive glass to be used as a transparent electrode;
and step 3: PSS, and then annealing to prepare a hole transport layer;
and 4, step 4: preheating the substrate prepared in the step (3) at 60-100 ℃ for 3-5 min, then spin-coating the ionic liquid modified perovskite precursor solution in the step (1) on the surface of the hole transport layer by a two-step spin coating method, then carrying out heat treatment at 60 ℃ for 5min and at 160 ℃ for 4-5 min, and obtaining a perovskite absorption layer on the surface of the hole transport layer;
and 5: coating anisole solution of imidazole ionic liquid on the surface of the perovskite absorption layer in a spinning mode, and then annealing to prepare an ionic liquid layer;
the anisole solution of the imidazole ionic liquid is 1-7 mg/mL of anisole solution of the imidazole ionic liquid;
step 6: spin-coating a chlorobenzene solution of PCBM on the surface of the ionic liquid layer to prepare an electron transmission layer;
the chlorobenzene solution of the PCBM is 10-20 mg/mL of the chlorobenzene solution of the PCBM;
and 7: spin-coating an isopropanol solution of BCP on the surface of the electron transport layer to prepare a buffer layer;
the isopropanol solution of BCP is 0.3-1 mg/mL of the isopropanol solution of BCP;
and 8: and evaporating a metal electrode Ag on the buffer layer to obtain the perovskite solar cell.
2. The method for improving air stability of trans-form all-inorganic perovskite solar cell based on ionic liquid according to claim 1, characterized in that: the cleaning in the step 2 comprises the steps of sequentially cleaning the detergent, distilled water, ethanol, acetone and isopropanol, drying the mixture by using nitrogen, and then using O to dry the mixture2And (4) carrying out plasma treatment.
3. The method for improving air stability of trans-form all-inorganic perovskite solar cell based on ionic liquid according to claim 3, wherein the method comprises the following steps: the plasma treatment time is 10-15 min.
4. The method for improving air stability of trans-form all-inorganic perovskite solar cell based on ionic liquid according to claim 1, characterized in that: and 3, spin coating PEDOT in the step 3, wherein the rotation speed of PSS is 4000-6000 revolutions per minute, the spin coating time is 30 seconds, and then annealing is carried out for 10-20 min at 150 ℃.
5. The method for improving air stability of trans-form all-inorganic perovskite solar cell based on ionic liquid according to claim 1, characterized in that: the two-step spin coating method in the step 4 comprises the following steps: spin coating at 1000 rpm for 10 seconds and then at 4000 rpm for 30 seconds.
6. The method for improving air stability of trans-form all-inorganic perovskite solar cell based on ionic liquid according to claim 1, characterized in that: the imidazole ionic liquids include, but are not limited to: 1-butyl-3-methylimidazolium hexafluorophosphate BMIMPF61-allyl-3-methylimidazolium tetrafluoroborate AMIMBF41-butyl-3-methylimidazolium tetrafluoroborate BMIMBF41-butyl-3-methylBMIMBr as the radical imidazole bromide salt or BMIMI as the 1-butyl-3-methyl imidazole iodide salt.
7. The method for improving air stability of trans-form all-inorganic perovskite solar cell based on ionic liquid according to claim 1, characterized in that: in the step 5, an anisole solution of the imidazole ionic liquid is spin-coated, the rotation speed is 5000-9000 revolutions per minute, the spin-coating time is 30 seconds, and then the thermal treatment is carried out for 10-15 min at 100 ℃.
8. The method for improving air stability of trans-form all-inorganic perovskite solar cell based on ionic liquid according to claim 1, characterized in that: and 6, spin-coating PCBM chlorobenzene solution at the rotation speed of 1000-2000 revolutions per minute for 30 seconds, and then carrying out heat treatment at 70 ℃ for 10-15 min.
9. The method for improving air stability of trans-form all-inorganic perovskite solar cell based on ionic liquid according to claim 1, characterized in that: and (3) carrying out heat treatment on the isopropanol solution of BCP in the step (7) at the rotation speed of 4000-6000 revolutions per minute for 30 seconds after spin coating for 10-15 min at 70 ℃.
10. The method for improving air stability of trans-form all-inorganic perovskite solar cell based on ionic liquid according to claim 1, characterized in that: the thickness of the metal electrode Ag in the step 8 is 70-100 nm.
CN202111429921.6A 2021-11-29 2021-11-29 Method for improving air stability of trans-form all-inorganic perovskite solar cell based on ionic liquid Pending CN114242902A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023240629A1 (en) * 2022-06-17 2023-12-21 宁德时代新能源科技股份有限公司 Ionic compound and use thereof, perovskite precursor solution, perovskite material, solar cell, and electrical device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023240629A1 (en) * 2022-06-17 2023-12-21 宁德时代新能源科技股份有限公司 Ionic compound and use thereof, perovskite precursor solution, perovskite material, solar cell, and electrical device

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