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Perovskite solar cell capable of regulating and controlling growth of lead iodide passivation layer and preparation method

A solar cell and perovskite technology, applied in the field of solar cells, can solve the problems of poor quality of lead iodide film, imperfect passivation defects, poor quality of perovskite film, etc. The effect of stability and quality improvement

Inactive Publication Date: 2020-09-08
SOUTHWEST PETROLEUM UNIV
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  • Claims
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Problems solved by technology

[0006] The object of the present invention is to provide a kind of perovskite solar cell and preparation method that can regulate and control the growth of lead iodide passivation layer, to solve the existing solar cell preparation method, the lead iodide thin film quality that obtains is relatively poor, causes to form The quality of the perovskite film is poor, and when the perovskite film is formed, the lead iodide passivation structure on the surface is still disordered, and cannot be located at the grain boundary in an orderly manner, and the passivation defect cannot be perfected.

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  • Perovskite solar cell capable of regulating and controlling growth of lead iodide passivation layer and preparation method

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preparation example Construction

[0030] The invention provides a method for preparing a perovskite solar cell capable of regulating and controlling the growth of a lead iodide passivation layer, comprising the following steps:

[0031] S1: Clean the surface of the transparent conductive substrate 1, and dry it with dry nitrogen after cleaning; preferably, the surface roughness of the transparent conductive substrate 1 is less than 1 nm, and the cleaning method is ultrasonic cleaning;

[0032] S2: Spin-coat the electron transport layer 2 on the surface of the transparent conductive substrate 1;

[0033] S3: Treat the transparent conductive substrate 1 with the electron transport layer 2 with ultraviolet and ozone for 5 minutes to 30 minutes;

[0034]S4: Prepare the lead iodide colloid in a nitrogen environment, then add ligands to the lead iodide colloid, and stir;

[0035] S5: Spin-coat the reagent prepared in S4 on the electron transport layer 2 in a nitrogen environment, and perform annealing and crystalli...

Embodiment 1

[0050] Choose ITO as transparent conductive substrate, SnO 2 As an electron transport layer, (FAPbI 3 ) 1-x (MAPbBr 3 ) x As a perovskite light-absorbing layer, Spiro-OMeTAD is used as a hole transport layer material, choline chloride is used as a ligand material, and metal Ag electrodes are prepared by thermal evaporation.

[0051] The preparation method is as follows:

[0052] S1: Cleaning of the conductive substrate: ultrasonically clean the cut ITO conductive glass substrate in acetone, isopropanol and ethanol for 30 minutes each, and then blow dry with nitrogen flow;

[0053] S2: Preparation of electron transport layer: UV ozone treatment was performed on the ITO conductive glass substrate for 15 minutes, and a layer of SnO was deposited on the cleaned ITO surface by spin coating 2 To make the electron transport layer, anneal at 150°C for 30 minutes. After the annealing is completed, treat the conductive substrate with the electron transport layer prepared by ultravi...

Embodiment 2

[0060] Such as figure 1 As shown, choose ITO as the transparent conductive substrate, SnO 2 As an electron transport layer, FAPbI 3 As a perovskite light-absorbing layer, Spiro-OMeTAD is used as a hole transport layer material, PEAI is used as a ligand material, and metal Ag electrodes are prepared by thermal evaporation.

[0061] The preparation method is as follows:

[0062] S1~S2 steps are similar to S1~S2 in embodiment 1;

[0063] S3: In a nitrogen atmosphere, add 0.6 g of lead iodide crystals mainly with (101) crystal planes to 1 mL of a mixed solution of dimethylformamide and dimethyl sulfoxide with a volume ratio of 9:1. Stir at high temperature for 240min to form lead iodide colloid, then add 0.001g of PEAI to the lead iodide colloid, and stir at 80°C for 240min;

[0064] S4: In a 99.9% nitrogen environment, the reagent prepared in S3 was spin-coated at 1500 rpm, and annealed and crystallized at 70° C. for 10 seconds to form a lead iodide film on the electron trans...

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Abstract

The invention discloses a perovskite solar cell capable of regulating and controlling the growth of a lead iodide passivation layer and a preparation method, and belongs to the technical field of solar cells. The preparation method comprises the steps of spin-coating the surface of a transparent conductive substrate with an electron transport layer; preparing a lead iodide colloid, adding a ligandinto the lead iodide colloid, and stirring; spin-coating the prepared lead iodide colloid on the electron transport layer, and carrying out annealing crystallization treatment to form a lead iodide thin film on the electron transport layer; spin-coating halide cations on the lead iodide thin film to generate a perovskite light absorption layer; preparing a hole transport layer on the perovskite light absorption layer; and forming a silver electrode on the composite hole transport layer. According to the perovskite solar cell capable of regulating and controlling the growth of the lead iodidepassivation layer and the preparation method provided by the invention, by adding the ligand material into the lead iodide colloid, the oriented growth of the lead iodide thin film is regulated and controlled, the orderliness of lead iodide crystals is improved, the quality of the lead iodide thin film is improved, and defects in the perovskite thin film are more accurately passivated.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a perovskite solar cell capable of regulating the growth of a lead iodide passivation layer and a preparation method thereof. Background technique [0002] With the development and progress of human society, people's consumption and dependence on energy are gradually increasing. At present, about 74% of the energy consumed by human beings comes from traditional fossil energy, mainly including coal, oil and natural gas. Due to the excessive exploitation and utilization of human beings, non-renewable energy sources are gradually facing a crisis of depletion. In the face of such a severe energy crisis, the development and effective utilization of renewable clean energy has become a hot spot of concern. Among various renewable energy sources, solar energy is an inexhaustible source of energy, clean and pollution-free, and has become one of the most potential energy sources. So...

Claims

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Application Information

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IPC IPC(8): H01L51/42H01L51/44H01L51/46H01L51/48
CPCH10K71/12H10K71/40H10K85/30H10K30/88H10K30/00Y02E10/549
Inventor 马柱黄德军肖政晏广元蒋汇丰黄跃龙
Owner SOUTHWEST PETROLEUM UNIV
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