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A PBS quantum dot heterojunction solar cell regulated by solvent and its preparation method

A technology of solvent regulation and solar cells, which is applied in circuits, photovoltaic power generation, electrical components, etc., can solve problems such as damage to device efficiency, and achieve the effects of reducing production costs, compact stacking, and reducing defects

Inactive Publication Date: 2017-04-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the previous studies used n-octane as a solvent, but n-octane has a higher boiling point, which will leave more solvent in the film and damage the device efficiency.

Method used

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  • A PBS quantum dot heterojunction solar cell regulated by solvent and its preparation method
  • A PBS quantum dot heterojunction solar cell regulated by solvent and its preparation method
  • A PBS quantum dot heterojunction solar cell regulated by solvent and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1 uses n-octane as solvent

[0047] choose as figure 1 The device structure of the heterojunction solar cell shown, using PbS quantum dots as the light absorbing layer, using ZnO / TiO 2 As the cathode interface layer, n-octane was used as a solvent for PbS quantum dots, and the specific experimental steps were as described above. Table 3 lists the device performance.

[0048] table 3

[0049]

Embodiment 2

[0050] Embodiment 2 uses toluene as solvent

[0051] Repeat Example 1, using toluene as the solvent for PbS quantum dots, and other conditions remain unchanged. Table 4 lists the device performance.

[0052] Solvents with different polarities have different degrees of affinity for substrates. Toluene is very polar, so with TiO 2 Good affinity, can make PbS quantum dots better attached to TiO 2 superior. Comparing Table 3 and Table 4, it can be seen that the open circuit voltage and fill factor of the prepared device are greater than those using n-octane as a solvent. Show that the use of toluene proposed by the present invention as a solvent for PbS quantum dots can effectively reduce the amount of PbS quantum dots and TiO 2 Defects at the interface reduce recombination loss and increase the open circuit voltage and fill factor of the device.

[0053] Table 4

[0054]

Embodiment 3

[0055] Embodiment 3 uses isooctane as solvent

[0056] Repeat Example 1, using isooctane as the solvent for PbS quantum dots, and other conditions remain unchanged. Table 5 lists device performance.

[0057] table 5

[0058]

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Abstract

The invention discloses a PbS quantum dot heterojunction solar cell employing solvent regulation and control and a preparation method of the PbS quantum dot heterojunction solar cell. The PbS quantum dot heterojunction solar cell is formed by sequentially stacking a glass substrate, an anode, an anode interface layer, an optical active layer and a cathode. The PbS quantum dot heterojunction solar cell is characterized in that a solvent regulation and control technology is used when the optical active layer is prepared; PbS quantum dots are dissolved by one or a mixture of two of normal octane, isooctane, heptanes, normal hexane and methylbenzene as a solvent; and a light absorption layer is formed by the solution in manners of spin-coating, brush-coating, spray-coating, dip-coating, roll-coating, silk-screen printing and printing or ink-jet printing. A PbS quantum dot thin-film is regulated and controlled by the properties of different polarities, viscosities, boiling points and the like of different solvents, so that the thin film is relatively dense and smooth; and the defects in the thin film are reduced. According to the PbS quantum dot heterojunction solar cell, the energy conversion efficiency of the PbS quantum dot heterojunction solar cell can be obviously improved; the PbS quantum dot heterojunction solar cell is simple in preparation technology; the preparation process can be finished in the atmosphere environment; and the preparation cost is greatly reduced.

Description

technical field [0001] The invention relates to the field of optoelectronic devices, in particular to the technical field of quantum dot solar cells, in particular to a PbS quantum dot heterojunction solar cell regulated by a solvent and a preparation method thereof. Background technique [0002] With the rapid economic development, my country's energy demand is increasing year by year. However, my country's long-term energy structure dominated by coal and oil has caused a large amount of carbon emissions and air pollution. In order to protect the ecological environment, we urgently need to develop renewable energy sources, such as solar energy and wind energy. [0003] Solar cells that convert solar energy into electrical energy based on the photovoltaic effect have always been a research hotspot at home and abroad. At present, the solar cells widely used are mainly monocrystalline silicon solar cells, polycrystalline silicon solar cells and amorphous silicon thin film so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0725H01L31/0352H01L31/18
CPCH01L31/035218H01L31/0725H01L31/18Y02E10/50Y02P70/50
Inventor 覃东欢杨跃骅吴荣方薛浩
Owner SOUTH CHINA UNIV OF TECH