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Solar cell coated with ZnSe/ZnS colloidal quantum dots and preparation method thereof

A technology of colloidal quantum dots and solar cells, applied in the field of solar cells, can solve the problems of reduced luminous efficiency of transfer materials under fluorescence, uneven film thickness, etc., and achieve the effects of avoiding the reduction of luminous intensity, improving solubility, and increasing external quantum efficiency.

Active Publication Date: 2017-12-08
麟州(巨野)孵化器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fluorescence down-transfer materials are usually spin-coated on the surface of solar cells by spin coating, which can ensure that the structure of the cell is not damaged, and can ensure that the emission spectrum of the down-transfer layer is effectively used. Generally, the down-transfer fluorescence The material is directly dispersed into the polymer. This method is likely to cause a decrease in the luminous efficiency of the transfer material under fluorescence and uneven film thickness.

Method used

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  • Solar cell coated with ZnSe/ZnS colloidal quantum dots and preparation method thereof
  • Solar cell coated with ZnSe/ZnS colloidal quantum dots and preparation method thereof
  • Solar cell coated with ZnSe/ZnS colloidal quantum dots and preparation method thereof

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Embodiment 1

[0029] Preparation method of ZnSe / ZnS-SH colloidal quantum dots:

[0030] 0.38g of NaBH 4Dissolve in 100ml of deionized water, add 0.395g of Se powder, and react at room temperature for 1.5h until the black Se powder is completely dissolved to obtain a clear and transparent NaHSe solution; to 25ml of 0.1M Zn(NO 3 ) 2 ·6H 2 Add 0.2ml of mercaptopropionic acid to the O solution, adjust the pH value to 10.3 with 2M NaOH solution, and prepare No. 1 mixed solution; quickly inject 50ml of NaHSe solution into No. 1 mixed solution to prepare No. 1 precursor solution , Zn in No. 1 precursor solution 2+ : Se 2- : The concentration ratio of cysteamine mercaptopropionate is 1:0.9:20, N 2 The crude ZnSe-SH quantum dots were prepared by heating at 100°C under atmosphere. Add absolute ethanol dropwise to the ZnSe-SH quantum dot crude product to obtain a suspension, put the suspension into a centrifuge at a speed of 18,000r / min and centrifuge, remove the supernatant, wash with absolute ...

Embodiment 2

[0032] ZnSe / ZnS-NH 2 Preparation method of colloidal quantum dots:

[0033] 0.38g of NaBH 4 Dissolve in 100ml of deionized water, add 0.395g of Se powder, and react at room temperature for 1.5h until the black Se powder is completely dissolved to obtain a clear and transparent NaHSe solution; to 25ml of 0.1M Zn(NO 3 ) 2 ·6H 2 Add 0.2ml of cysteamine to the O solution, and adjust the pH value to 3.1 with 1M HCl solution to prepare No. 1 mixed solution; quickly inject 50ml of NaHSe solution into No. 1 mixed solution to prepare No. 1 precursor solution , Zn in No. 1 precursor solution 2+ : Se 2- : The concentration ratio of cysteamine is 1:0.9:20, N 2 Heating at 100°C under atmosphere to prepare ZnSe-NH 2 Quantum dot crude. To ZnSe-NH 2 Add absolute ethanol to the crude product of quantum dots drop by drop to obtain a suspension, put the suspension into a centrifuge at 18000r / min for centrifugation, remove the supernatant, and wash three times with absolute ethanol at th...

Embodiment 3

[0035] The preparation method of the solar cell coated with ZnSe / ZnS colloidal quantum dots:

[0036] ZnSe / ZnS-SH (or ZnSe / ZnS-NH 2 ) Colloidal quantum dots were dissolved in deionized water to obtain 06M ZnSe / ZnS-SH (or ZnSe / ZnS-NH 2 ) colloidal quantum dot solution, after ultrasonic 15min, ZnSe / ZnS-SH colloidal quantum dot solution and ZnSe / ZnS-NH 2 The colloidal quantum dot solution is spin-coated on the surface of the Si-based solar cell at a low speed respectively. The low-speed spin coating includes a normal section and an end section. The speed of the normal section is 300r / s, the speed of the end section is 1500r / s, and the time of the end section is 20s. The excess solution is spun to remove, and a solar cell is obtained after forming a film through electrostatic interaction.

[0037] figure 1 It can be seen that the luminescence intensity of colloidal quantum dots with core-shell structure and mercaptopropionic acid (or cysteamine) is significantly improved, and Z...

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Abstract

The invention relates to the technical field of solar cells, and in particular to a solar cell coated with ZnSe / ZnS colloidal quantum dots and a preparation method thereof. The solar cell includes a Si-based solar cell and a ZnSe / ZnS colloidal quantum dots. The ZnSe / ZnS colloidal quantum dot is a core-shell structure which is provided with a ZnSe / ZnS-SH colloidal quantum dots of negative group sulfydryl-SH and ZnSe / ZnS-NH2 colloidal quantum dots of positive group amidogen-NH2 on the surface thereon. The Si-based solar cell and the ZnSe / ZnS colloidal quantum dots form layers of films through electrostatic interaction. The ZnSe / ZnS-SH and the ZnSe / ZnS-NH2 colloidal quantum dot solution is spin-coated on the surface of the Si-based solar cell at low speed, after the film formation, a solar cell is obtained. The solar cell herein overcomes the defects of low lighting intensity of quantum dots which are caused by scattering of polymers, uses the lighting characteristics of ZnS / ZnS quantum dots at the maximum, has controllable film formation parameters, has reduced reflection on the surface thereof and increased external quantum efficiency, has higher short circuit current and a conversion efficiency which is 5-10 % higher than traditional solar cells.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a solar cell coated with ZnSe / ZnS colloidal quantum dots and a preparation method thereof. Background technique [0002] The spectral response of Si-based solar cells is low in the short-wave region, and the reflectivity in this band is relatively high, so most of the photons in this band are either reflected on the surface or lost before reaching the p-n junction of the solar cell, making The short-wavelength photon energy in the solar spectrum has not been effectively utilized, resulting in the defect that Si-based solar cells have low quantum efficiency outside the short-wavelength region. How to utilize the energy of short-wavelength photons in the solar spectrum has always been a research hotspot in the field of photovoltaics. [0003] An economical and effective way to improve the weak spectral response of Si-based solar cells in the ultraviolet region is to convert th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0352H01L31/18
CPCH01L31/035218H01L31/18Y02P70/50
Inventor 刘妮
Owner 麟州(巨野)孵化器有限公司