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Preparing method of carbon quantum dot modified perovskite solar cell

A technology of solar cells and carbon quantum dots, applied in the field of solar cells, can solve the problems of perovskite solar cells utilization, uneven size, poor dispersion, etc., to improve photoelectric conversion efficiency and stability, good dispersion, and stability good sex effect

Inactive Publication Date: 2018-11-23
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, most carbon quantum dots are synthesized by chemical methods, and this process has some defects: long cycle, cumbersome process, high cost, uneven size, etc. use

Method used

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Examples

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Embodiment 1

[0034] A method for preparing a perovskite solar cell modified by carbon quantum dots, the method is specifically carried out according to the following steps:

[0035] S1. Under anhydrous and oxygen-free conditions, irradiate 6 mL of chlorobenzene anti-solvent with a pulsed laser with a wavelength of 355 nm and an energy of 100 mJ for 10 min to prepare carbon quantum dots with a size of about 3 nm and a concentration of 0.1 mg / mL, such as figure 2 As shown in the transmission electron microscope photo;

[0036] S2. Select FTO glass (fluorine-doped SnO glass with a square resistance of 15Ω / sq, a thickness of 2.2mm, and a transmittance of 84.5%). 2 transparent conductive glass) as the conductive matrix, the FTO glass was ultrasonically cleaned in glass cleaner, acetone, and absolute ethanol for 20 minutes, and then dried with nitrogen, and the dried glass was cleaned in an ozone plasma cleaning machine for 15 minutes to remove Organic matter on glass surface and enhanced surf...

Embodiment 2

[0044] A method for preparing a carbon quantum dot modified perovskite solar cell, characterized in that the method is specifically carried out according to the following steps:

[0045] S1. Under anhydrous and oxygen-free conditions, irradiate 6mL of chlorobenzene anti-solvent with a pulsed laser with a wavelength of 355nm and an energy of 100mJ for 30min to prepare carbon quantum dots with a size of about 3nm and a concentration of 0.6mg / mL, such as Figure 4 As shown in the transmission electron micrograph, compared with Example 1, the size of the carbon quantum dots is constant, and the concentration increases;

[0046] S2. Choose FTO glass with a square resistance of 15Ω / sq, a thickness of 2.2mm, and a transmittance of 84.5% as the conductive substrate. Clean the FTO glass in glass cleaner, acetone, and absolute ethanol for 20 minutes, and then use nitrogen gas Blow dry, and clean the dried glass in an ozone plasma cleaning machine for 15 minutes to remove organic matter ...

Embodiment 3

[0054] A method for preparing a carbon quantum dot modified perovskite solar cell, characterized in that the method is specifically carried out according to the following steps:

[0055] S1. Under anhydrous and oxygen-free conditions, irradiate 6mL of chlorobenzene anti-solvent with a pulsed laser with a wavelength of 355nm and an energy of 200mJ for 30min to prepare carbon quantum dots with a size of about 5nm and a concentration of 0.6mg / mL, such as Figure 6 As shown in the transmission electron micrograph, compared with Example 2, the size of the carbon quantum dots increases, and the concentration remains unchanged;

[0056] S2. Choose FTO glass with a square resistance of 15Ω / sq, a thickness of 2.2mm, and a transmittance of 84.5% as the conductive substrate. Clean the FTO glass in glass cleaner, acetone, and absolute ethanol for 20 minutes, and then use nitrogen gas Blow dry, and clean the dried glass in an ozone plasma cleaning machine for 15 minutes to remove organic m...

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Abstract

The invention belongs to the technical field of solar cells, and relates to a preparing method of a carbon quantum dot modified perovskite solar cell. The preparing method comprises the steps that a carbon quantum dot solution is prepared in situ through a pulse laser irradiation anti-solvent; then a transparent conductive substrate covered with an electron transmission layer is spin-coated with aperovskite precursor solution, the carbon quantum dot solution is dripped onto a perovskite thin film in the spin-coating process, and the perovskite thin film modified by carbon quantum dots is formed after heat treatment; and finally, a hole transport layer and a metal electrode are prepared, and preparation of the perovskite solar cell is completed. The carbon quantum dots prepared through themethod are controllable in size and excellent in dispersity and stability, and can be directly introduced into the perovskite thin film, and the preparation process of perovskite is simplified advantageously. The carbon quantum dot modified perovskite solar cell prepared through the preparing method is high in photoelectric conversion efficiency and good in stability, the maximum efficiency can reach 21% or above, and the carbon quantum dot modified perovskite solar cell has extremely high practical application value.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and relates to a preparation method of a perovskite solar cell modified by carbon quantum dots. Background technique [0002] In the field of photovoltaics, the photoelectric conversion efficiency of organic-inorganic hybrid perovskite solar cells prepared by low-temperature solution method has exceeded 20%, which is almost comparable to that of single crystal silicon solar cells. The most significant advantage of this low-temperature preparation technology is that it can simplify the battery preparation process and improve the film quality. However, polycrystalline perovskite films prepared by low-temperature solution method have a large number of defects at the surface and grain boundaries, which can lead to non-radiative recombination of carriers and accelerated degradation of the film by moisture and oxygen, thereby reducing the performance of the battery. How to improve battery efficien...

Claims

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Application Information

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IPC IPC(8): H01L51/48
CPCH10K71/12H10K30/152H10K30/151H10K30/15Y02E10/549
Inventor 王洪强郭鹏飞杨小昆叶谦
Owner NORTHWESTERN POLYTECHNICAL UNIV
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