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Method for preparing grapheme-quantum dot composite film and solar battery structured by using same

A technology of solar cells and composite thin films, applied in the field of solar cells, can solve problems such as low surface coverage, affect photoelectric conversion efficiency, limit photocurrent density, etc., achieve the effect of reducing probability and improving photoelectric conversion efficiency

Inactive Publication Date: 2011-09-07
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The quantum dots obtained in this case are usually randomly dispersed on the surface of the photoanode, and the number of quantum dots deposited is not easy to control. The surface coverage is low and the quantum dots that are over-stacked are prone to carrier recombination, which limits the photocurrent density and affects the optoelectronics. Conversion efficiency

Method used

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  • Method for preparing grapheme-quantum dot composite film and solar battery structured by using same
  • Method for preparing grapheme-quantum dot composite film and solar battery structured by using same
  • Method for preparing grapheme-quantum dot composite film and solar battery structured by using same

Examples

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Embodiment 1

[0029] Embodiment 1: a kind of preparation method of graphene-quantum dot composite film comprises the steps:

[0030] (1) Use 1g of natural graphite powder as raw material, add 0.8g of sodium nitrate, cold concentrated sulfuric acid and 3g of potassium permanganate, mix evenly when it is lower than 20°C, and then heat up to 35°C for 30min. Slowly add deionized water to the above mixed solution for dilution, raise the temperature to 98°C for 15 minutes, then add 10ml of 30% hydrogen peroxide solution; then centrifugally filter the above solution, wash with dilute hydrochloric acid solution to remove metal ions, and then use deionized Washing with water to remove excess acid, and washing with water several times to neutrality, finally obtain an aqueous solution of graphite oxide flakes, which is then subjected to ultrasonic treatment to obtain a yellow-brown uniformly dispersed graphene oxide solution.

[0031] (2) Take the above-mentioned uniformly dispersed graphene oxide sol...

Embodiment 2

[0036] Example 2: The preparation process and steps in this example are exactly the same as those in Example 1 above. The difference is: the graphene oxide and the reaction solution are mixed in a ratio of 1:1.5. figure 1 It is the transmission electron microscope (TEM) photo figure of this embodiment.

Embodiment 3

[0037] Example 3: The preparation process and steps in this example are exactly the same as those in Example 1 above. The difference is: the graphene oxide and the reaction solution are mixed in a ratio of 1:6.

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Abstract

The invention relates to a method for preparing a grapheme-quantum dot composite film and a solar battery structured by using the same. The method comprises the following steps of: performing suction filtering on a suspension of grapheme-quantum dot composite powder on a filtering film to obtain a film; and then dissolving the filtering film away with an organic solvent, and transferring the filmto a conductive substrate. The method is characterized in that the ratio of the quantum dot to the grapheme and the thickness of the film can be controlled effectively; in addition, since the film isprepared at normal temperature, the requirement on the conductive substrate is reduced greatly. The prepared film can be used for structuring a novel quantum dot sensitized solar battery. The structured solar battery is of a layer structure, consists of the grapheme-quantum dot film on the conductive substrate, an electrolyte layer and a counter electrode and has the advantages of low cost, simpleness in preparation process, low temperature and stable performance. By the use of the grapheme-quantum dot composite film prepared by the method provided by the invention, the photoelectron transmission performance can be improved, and the photoelectric conversion efficiency of a battery can be enhanced.

Description

technical field [0001] The invention relates to a preparation method of a graphene-quantum dot composite thin film and an application in the constructed quantum dot sensitized solar cell. Belongs to the field of solar cells Background technique [0002] Today, with the continuous depletion of energy and the increasing awareness of environmental protection, the application of solar cells has received extensive attention. Some researchers have proposed that the narrow-bandgap semiconductor can be adsorbed on the surface of the wide-bandgap semiconductor to overcome the defect that the wide-bandgap semiconductor itself weakly captures sunlight, and broaden the spectral response of the battery to the visible light region. This kind of battery is a quantum dot sensitized solar cell ( QDSSC). [0003] A typical QDSSC cell consists of a transparent conductive glass, a porous nanofilm with quantum dots, an electrolyte, and a platinum counter electrode. Quantum dot sensitization h...

Claims

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Application Information

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IPC IPC(8): H01G9/04H01G9/20H01M14/00H01L31/18H01L31/0352
CPCY02P70/50
Inventor 高濂孙盛睿刘阳桥孙静
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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