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Quantum dot sensitized solar battery and preparation method thereof

A technology for quantum dot sensitization and solar cells, which is applied in the field of quantum dot sensitization solar cells and its preparation, can solve the problems of low adsorption capacity, poor carrier transport, reduced battery stability and conversion efficiency, etc.

Active Publication Date: 2015-09-30
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also has problems such as low adsorption capacity and poor carrier transport, which reduces the stability and conversion efficiency of the battery.

Method used

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  • Quantum dot sensitized solar battery and preparation method thereof
  • Quantum dot sensitized solar battery and preparation method thereof
  • Quantum dot sensitized solar battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Firstly, the mass percentage concentration of screen printing on the conductive layer FTO glass is 20% TiO 2 The slurry is first dried in an oven at 80°C, and then heated at 450°C for 30 minutes to obtain TiO with a thickness of 3-20μm. 2 Nanocrystalline porous layer.

[0039] 2) Preparation of quantum dot precursor solution: prepare colloidal quantum dots by chemical synthesis (hydrothermal method, etc.), mix colloidal quantum dots with a solvent, and obtain a quantum dot precursor solution suitable for an ultrasonic spray system with a concentration of 2 to 25 wt%.

[0040] 3) Take 5g of the quantum dot precursor solution obtained in step 2), dissolve it in 5mL of ethanol, then place the transparent substrate with a nanocrystalline porous layer on a hot stage at 40°C, and use an ultrasonic spray system to spray the quantum dots Dots were deposited on the nanocrystalline porous layer with a spraying time of 20 seconds. Then heat the transparent substrate at 40° C....

Embodiment 2-16

[0045] The preparation method is the same as that of Example 1, except that the materials of the quantum dots are different, and the thickness and particle size are also different. See Table 1 for details.

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Abstract

The invention discloses a quantum dot sensitized solar battery and a preparation method thereof. The quantum dot sensitized solar battery comprises a nano-crystal porous layer, wherein a quantum dot thin film layer and a passivation layer cover the surfaces of nano-crystal particles of the nano-crystal porous layer in sequence; the quantum dot thin film layer is formed by an ultrasonic spraying method. By adoption of the ultrasonic spraying method, a narrow-gap inorganic quantum dot precursor solution is sprayed on the surfaces of the nano-crystal particles; compared with a quantum dot sensitized solar battery prepared by a conventional deposition method, the quantum dot sensitized solar battery disclosed by the invention has the advantage that the obtained quantum dot thin film layer is more uniform; furthermore, in the preparation process, the thickness of the quantum dot thin film layer can be controlled by controlling the spraying time of ultrasonic spraying, so that the uniform quantum dot thin film layer with a controllable film thickness can be obtained; the uniformity and the light absorption intensity of quantum dot deposition are improved, so that the quality of the quantum dot thin film layer is improved. The quantum dot sensitized solar battery prepared by the method disclosed by the invention is higher in stability; meanwhile, the photoelectric conversion efficiency is obviously improved, and the quantum dot sensitized solar battery is suitable for large-scale application.

Description

technical field [0001] The invention relates to the technical field of quantum dot solar cells, in particular to a quantum dot sensitized solar cell and a preparation method thereof. Background technique [0002] A solar cell is a device that converts solar energy into electrical energy. It is based on semiconductor materials. Its working principle is to use photoelectric materials to absorb sunlight to generate photogenerated electrons. According to the semiconductor materials used, solar cells are divided into silicon-based solar cells based on silicon materials, cells based on III-V compounds (such as GaAs), CuInSeS and other multi-component compounds, organic polymer cells based on functional polymer materials , Nanocrystalline sensitized solar cells, quantum dot solar cells, based on inorganic organic lead perovskite solar cells, etc. Among them, quantum dot solar cells have attracted attention due to their low cost and simple manufacturing process. In particular, the...

Claims

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Application Information

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IPC IPC(8): H01G9/20
Inventor 李冬梅孟庆波王国帅卫会云罗艳红
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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