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A method to improve the stability of perovskite batteries through black phosphorus

A technology of perovskite battery and stability, which is applied in the field of energy and materials, can solve problems such as stability problems and obstacles to the commercialization of batteries, and achieve the effects of large-scale industrial production, easy access, and convenient operation

Active Publication Date: 2021-10-29
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this time, the stability of perovskite batteries under actual working conditions, that is, under long-term light conditions, has undoubtedly become the biggest obstacle to the commercialization of new batteries such as perovskites.

Method used

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  • A method to improve the stability of perovskite batteries through black phosphorus
  • A method to improve the stability of perovskite batteries through black phosphorus
  • A method to improve the stability of perovskite batteries through black phosphorus

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Embodiment 1

[0031] This embodiment relates to a method of adding a two-dimensional material black phosphorus dispersion to the precursor, and then obtaining a perovskite film by spin coating. The method includes the following steps:

[0032] S1. After dispersing the two-dimensional material black phosphorus in DMF, ultrasonically treat it at 20-30°C for 1-3 hours to obtain a 0.1g / L black phosphorus dispersion;

[0033] S2, the MAI, PbI 2 After mixing according to the molar ratio of 1:1, dissolve in 400 μL of DMSO, add 1.2 mL of DMF and 400 μL of the black phosphorus dispersion prepared in step S1, and mix to obtain a precursor solution;

[0034] S3. Spin-coat the perovskite precursor solution containing black phosphorus on the surface of the perovskite substrate at a speed of 5000rpm for 20s, wherein 400uL of chlorobenzene is added dropwise 17s before the end of the spin-coating time. Annealed at 100°C for 20 min to obtain a perovskite film.

[0035] The surface of the perovskite thin f...

Embodiment 2

[0038] The present embodiment method is the same as embodiment 1, the difference is that the concentration of black phosphorus is from 0.02mg·mL -1 Increased to 0.05mg·mL -1 ,From Figure 4 It can be found that even if the concentration of black phosphorus increases to 0.05 mg·mL -1 , the addition of black phosphorus does not lead to changes in the UV-visible absorption spectrum of perovskite films. according to Figure 5 It can be seen that the efficiency of its perovskite cells containing black phosphorus is as high as 20.65%. Table 1 has provided the photovoltaic parameter of embodiment 2, the short-circuit current (J sc ) and fill factor (FF) are significantly improved, and its photoelectric conversion efficiency is 20.65%. Figure 6 A schematic diagram of the change of the photoelectric conversion efficiency of the perovskite cell containing black phosphorus under continuous light conditions is given. From Figure 6 It can be found that after 500 hours of continuou...

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Abstract

The invention provides a method for improving the stability of a perovskite battery through black phosphorus; comprising the following steps: dispersing black phosphorus, a two-dimensional material, in DMF to obtain a black phosphorus dispersion; mixing MAI and PbI 2 After mixing, it is dissolved in DMSO, and DMF and the black phosphorus dispersion are added, and the precursor solution is obtained after mixing; the precursor solution is spin-coated on the surface of the perovskite substrate, and then annealed at a low temperature to obtain the perovskite thin film. The invention has the following beneficial effects: the black phosphorus used in the invention has been commercialized, cheap and easy to obtain; the invention is convenient to operate, and can be obtained in one step by adding a small amount of black phosphorus to the traditional perovskite precursor solution The high-quality perovskite film can meet the needs of large-scale industrial production; the battery efficiency of the assembled perovskite film containing two-dimensional material black phosphorus obtained by the present invention is as high as 20.65%. After 500 hours of continuous light experiment, the efficiency does not appear any decline.

Description

technical field [0001] The invention belongs to the technical field of energy and materials, and in particular relates to a method for improving the stability of a perovskite battery through black phosphorus. Background technique [0002] Solar cells based on the photovoltaic effect can directly convert solar energy into electrical energy, which is one of the most promising technologies to solve the energy crisis. In 2012, the all-solid-state organic-inorganic hybrid lead halide perovskite CH 3 NH 3 PB 3 (MAPbI 3 ) Solar cells (abbreviated as perovskite cells) have sprung up due to the advantages of high efficiency, low cost and simple production process. . In the latest solar cell efficiency certification chart published by NREL in 2017, the certified efficiency of perovskite cells has reached 22.7%. [0003] At the beginning of the development of perovskite, most of the high-efficiency perovskite cells in the laboratory had an effective area of ​​less than 0.1cm 2 ....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/48
CPCH10K71/30
Inventor 赵一新王勇钱旭芳张太阳阚淼
Owner SHANGHAI JIAOTONG UNIV