Method for modifying perovskite solar cell light-absorbing layer

A solar cell and light-absorbing layer technology, applied in the field of solar cells, can solve the problems of uneven perovskite crystal size, affecting device performance repeatability, limiting battery performance, etc., and achieve low cost, performance improvement, and porosity reduction Effect

Inactive Publication Date: 2016-04-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has a simple process, and the solvent volatilizes quickly during the film deposition process, and the solution concentrates rapidly, so CH 3 NH 3 I and PbI 2 The reaction speed between them is very fast, which easily leads to uneven size of perovskite crystals, resulting in more pinholes in the active layer.
The existence of these pinholes makes the perovskite unable to completely cover the substrate, resulting in a large leakage current; and the stability to water and oxygen is poor, and it is easy to be oxidized during the packaging process, which greatly affects the repeatability of its device performance. Limits battery performance

Method used

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  • Method for modifying perovskite solar cell light-absorbing layer
  • Method for modifying perovskite solar cell light-absorbing layer
  • Method for modifying perovskite solar cell light-absorbing layer

Examples

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Embodiment 1

[0038] With FTO as the substrate, TiO2 as the hole blocking layer, TiO2 as the mesoporous layer, CH 3 NH 3 PB 3The preparation method of the perovskite solar cell as the light absorbing layer, Spiro-OMeTAD as the hole transport layer, and gold as the counter electrode:

[0039] Step 1: Cut the FTO glass into a size of 2cm×2cm, clean the surface with deionized water, acetone and absolute ethanol in sequence, and dry it with nitrogen gas for later use;

[0040] Step 2: Add 103 mg of diisopropyl bis(acetylacetonate) titanate to 1000 mg of 1-butanol, stir for 30 min, and mix well to obtain a mixed solution A;

[0041] Step 3: Spin-coat the mixed solution A on the surface of the FTO glass cleaned in step 1, bake at 125° C., and then anneal at 500° C. for 30 minutes to obtain a titanium dioxide hole blocking layer;

[0042] Step 4: Add 200 mg of titanium dioxide slurry into 700 mg of absolute ethanol, stir for 30 minutes, and mix it evenly to obtain a mixed solution B;

[0043] ...

Embodiment 2

[0061] The difference between this example and Example 1 is that the modification solution in step 7 is a mixture of chlorobenzene and N,N-dimethylformamide, and the volume of the chlorobenzene and N,N-dimethylformamide The ratio is 19:1. All the other steps are the same as in Example 1.

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Abstract

The invention discloses a method for modifying a perovskite solar cell light-absorbing layer, and belongs to the field of the solar cell. The method comprises the steps of 1) preparing a hole barrier layer on a substrate; and 2) adding a light-absorbing layer precursor liquid in a dropwise manner on the surface of the substrate with the hole barrier layer, performing spin coating, after the solvent of the light-absorbing layer precursor liquid is fully evaporated, adding modifying liquid in a dropwise manner and continuing to perform spin coating, wherein the modifying liquid is mixed liquid of organic solvent of a soluble light-absorbing layer material and organic solvent of an insoluble light-absorbing layer material; the volume ratio of the organic solvent of the insoluble light-absorbing layer material to the organic solvent of the soluble light-absorbing layer material is 16-21, and the volume ratio of the total volume of the modifying liquid to the volume of the light-absorbing layer precursor liquid is 1-1.5; and drying after completing spin coating. According to the light-absorbing layer preparation process, the light-absorbing layer is modified by the modifying liquid; namely, a perovskite layer is subjected to film formation firstly; then the modifying liquid is adopted to dissolve and modify the light-absorbing layer so as to enlarge the crystal grains of the light-absorbing layer and reduce the porosity of the light-absorbing layer; and consequently, the performance of the perovskite solar cell is effectively improved.

Description

technical field [0001] The invention belongs to the field of solar cells, and in particular relates to a method for modifying a light-absorbing layer of a perovskite solar cell. Background technique [0002] Perovskite solar cells (perovskitessolarcells) is a device structure with dye-sensitized solar cells to have ABX 3 Structured organic-metal halides are used as the core light absorption, photoelectric conversion, and photogenerated carrier transport materials. The preparation process of perovskite solar cells is simple and has excellent photoelectric conversion performance, so it is expected to become a new generation of solar cells with the advantages of high efficiency, low cost, all-solid-state, flexible and wearable. [0003] Perovskite solar cells are mainly prepared by a one-step spin coating method, that is, a dense titanium dioxide layer, a titanium dioxide mesoporous layer, a perovskite light-absorbing layer, and a hole transport layer are prepared by spin coat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/42H01L51/48
CPCH10K71/12H10K30/151Y02E10/549
Inventor 贾春阳韩飞万中全
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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