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ito particles

A particle, indium tin hydroxide technology, applied in the field of ITO particles, can solve problems such as the decline in the power generation efficiency of solar cells, and achieve the effect of reducing energy barriers and improving power generation efficiency

Active Publication Date: 2017-08-25
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When ITO particles are used as the back electrode of a solar cell, the interface between ITO and Si becomes high resistance, which causes a problem in that the power generation efficiency of the solar cell decreases.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0038] First, indium chloride (InCl) containing 18 g of In metal 3 ) aqueous solution 50mL and 0.36g of stannous chloride (SnCl 2 2H 2 O) Mix, and drop the mixed aqueous solution and ammonia (NH 3 ) aqueous solution to adjust to pH7. It was made to react for 30 minutes in the state which made the solution temperature into 30 degreeC. The generated indium tin co-precipitated hydroxide, that is, the precipitate, was washed repeatedly with ion-exchanged water. When the resistivity of the supernatant reaches more than 50000Ω·cm, discard the supernatant of the above-mentioned sediment, make a high-viscosity slurry, and use an ultraviolet irradiation device (Ushio Electric's Spot Cure SP- 9), select the DeepUV type, and make the central illumination of the irradiated liquid surface reach 50mW / cm 2 5 hours of UV rays are irradiated. Thereafter, the slurry-like indium tin hydroxide was dried overnight at 110° C. in the air, and then fired at 550° C. in the air for 3 hours to pul...

Embodiment 2

[0040] In Example 1, the condenser lens when the indium tin co-precipitated hydroxide slurry is irradiated with ultraviolet rays is set as a standard type, except that it is manufactured in the same way as in Example 1 to obtain the ITO particles of the present invention .

Embodiment 3

[0042] Indium chloride (InCl) containing 18g of In metal 3 ) aqueous solution 50mL and 0.6g stannous chloride (SnCl 2 2H 2 O) to mix, drop the mixed aqueous solution and ammonia (NH 3 ) aqueous solution to adjust to pH7. It was made to react for 30 minutes in the state which made the solution temperature into 30 degreeC. The generated indium tin co-precipitated hydroxide, that is, the precipitate, was washed repeatedly with ion-exchanged water. When the resistivity of the supernatant reaches more than 50000 Ω·cm, discard the supernatant of the precipitate to obtain slurry-like indium tin hydroxide. The slurry was diluted with absolute ethanol so that the solid content reached 1.0%, and the inside of the tubular furnace arranged vertically to the long side direction of the tube was sufficiently replaced with nitrogen gas, heated to 600°C, and the carrier gas, namely N 2 In the state where the gas is circulating inside the tubular furnace, the slurry-like indium tin hydroxi...

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Abstract

The present invention provides ITO particles, which is capable of reducing the energy barrier between the ITO particles and a power generation layer when the ITO particles are used as a back electrode of a solar battery, so as to improve the power generation efficiency of the solar battery. The ITO particles have a work function ranges from 4.8 to 5.3 eV through repeat tests by using the Kelvin method on the basis of gold.

Description

technical field [0001] The invention relates to an ITO particle suitable for electronic equipment that needs to electrically bond different types of materials such as solar cells, touch panels, and liquid crystal panels. In this specification, ITO means indium tin oxide (Indium Tin Oxide). Background technique [0002] Conventionally, there has been disclosed a superstrate-type thin-film solar cell in which a composite film composed of a transparent conductive film and a conductive reflective film is formed as a rear electrode on a photoelectric conversion layer by a wet coating method (for example, refer to Patent Document 1). ITO particles are disclosed as one of the conductive oxide fine particles contained in the composition for forming the transparent conductive film. The ITO particles are prepared by mixing an aqueous alkali solution with an aqueous solution of an indium compound and a tin compound to form a co-precipitated hydroxide of indium and tin, washing the pre...

Claims

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Application Information

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IPC IPC(8): H01B1/08H01L31/18
CPCY02E10/50Y02P70/50
Inventor 米泽岳洋山崎和彦竹之下爱
Owner MITSUBISHI MATERIALS CORP
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