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A kind of cdte battery back electrode and cdte battery

A back electrode and battery technology, applied in the field of solar cells, can solve the problems of reducing the performance and stability of the battery, easy diffusion, and difficult to control the uniformity of the film layer, so as to achieve good electrical performance, good long-term stability, and improve battery performance. Effect

Active Publication Date: 2019-08-13
ADVANCED SOLAR POWER HANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, if too much Cu is introduced into the back electrode, Cu will easily diffuse into the front layer along the CdTe grain boundary gap, thereby reducing the performance and stability of the battery; and in the above method, if PVD is used to deposit Cu in the back electrode, the equipment cost High, very thin film uniformity is difficult to control, and the deposited Cu is easy to diffuse into the CdTe grain boundary due to the small particle size, which cannot effectively control the diffusion of Cu; the doping form also has high material complexity, and it is necessary to control Hg and The ratio of Cu, low material safety, difficulty in procurement, etc.

Method used

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  • A kind of cdte battery back electrode and cdte battery
  • A kind of cdte battery back electrode and cdte battery
  • A kind of cdte battery back electrode and cdte battery

Examples

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preparation example Construction

[0046] The present invention also provides a kind of preparation method of CdTe battery, comprises the following steps:

[0047] 1) Mixing the C / Cu composite material and the back electrode buffer material, and then placing it to obtain a mixed slurry;

[0048] After treating the CdTe surface of the battery semi-finished product compounded with the CdTe film, a battery semi-finished product with a Te-rich layer on the surface is obtained;

[0049] 2) compounding the mixed slurry on the Te-rich layer of the battery semi-finished product to obtain a battery semi-finished product with a mixed slurry layer compounded on the surface;

[0050] 3) After post-processing the mixed slurry layer, a CdTe battery is obtained.

[0051] In the present invention, the selection and ratio of raw materials in the preparation process of the CdTe battery and other optimization principles, unless otherwise specified, correspond to the uniformity of the aforementioned CdTe battery and the back elec...

Embodiment 1

[0063] Firstly, prepare C / Cu raw materials. Since C / Cu nanomaterials have agglomeration, they should be ground and filtered before use to make them disperse faster and more uniformly in the slurry. C / Cu nanomaterials (Zunye Nanomaterials Co., Ltd.) were ground in an agate mortar until there were no agglomerated particles, and the ground C / Cu was filtered through a 400-mesh sieve.

[0064] Carry out TEM test to the C / Cu nanocomposite material that above-mentioned steps obtains, see figure 2 , figure 2 Transmission electron microscope image of the C / Cu composite material prepared for the present invention. Depend on figure 2 It can be seen that the particle size of the C / Cu composite material is about 100nm. In the lower right corner of the figure, it can be seen that more black substances are agglomerated together, and the color of the edge part is lighter. The particle size in the middle of the picture is about 50nm, and it can be clearly seen that the darker part of the...

Embodiment 2

[0099] In the production process, when the slurry configuration and aging time are insufficient, the battery efficiency can be improved by annealing after the battery is completed.

[0100] As in the slurry configuration of Example 1, prepare a slurry with a suitable viscosity of 0.5% C / Cu content, and the stirring and standing time is shortened to half of that of Example 1.

[0101] Using TCO film as substrate, using rf magnetron sputtering process, in 10mTorr vacuum, O 2 / Ar about 2% atmosphere, 200W power, deposit a layer of polycrystalline CdS film on it, about 100nm. Transfer the sample to a close-range sublimation device with a source temperature of 660°C, a substrate temperature of 560°C, and a vacuum of 8 Torr, O 2 / N 2 In an atmosphere with a content of about 1.5%, polycrystalline CdTe of 5-6 μm is deposited on the CdS film layer to obtain a battery semi-finished product compounded with a CdTe film.

[0102] Then the CdTe surface was treated with NP solution. NP s...

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Abstract

The invention provides a CdTe battery back electrode which comprises a back electrode buffer material and a C / Cu composite material. The C / Cu composite material is formed by nanometer copper particles and a carbon layer which coats the surface of the nanometer copper particles. According to the CdTe battery back electrode, a carbon coating copper composite material is added into the back electrode buffer material for replacing Cu. The carbon coating structure can effectively prevent an environment influence to the coated nanometer Cu particles, thereby supplying a relatively stable environment to the Cu particles. Furthermore the carbon coating copper composite material is doped into the back electrode buffer material. The coating layer is similar with a used body material slurry component, and relatively high compatibility can be realized. The Cu particle which is coated can react with a rich-Te layer for generating CuxTe for supplying a Cu material, and the generated the CuxTe can effectively improve battery performance. Furthermore because of coating by the carbon layer, front diffusion caused by Cu concentration difference is remarkably reduced from pure Cu, thereby effectively controlling Cu diffusion and realizing long-term stability of the battery.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a CdTe battery back electrode and a CdTe battery. Background technique [0002] Cadmium telluride thin-film solar cell, referred to as CdTe cell, is a thin-film solar cell based on the heterojunction of p-type CdTe and n-type Cd. CdTe matches the solar spectrum very well, and is most suitable for photoelectric energy conversion. It is a good The PV material has a very high theoretical efficiency (28%), has been valued by the photovoltaic field, and is a kind of thin-film battery with rapid development in technology. [0003] A typical CdTe battery has such figure 1 As shown in the structural diagram, a commercial TCO film is used as a substrate, and a layer of polycrystalline CdS film is deposited on it, that is, the window layer. The CdS film layer can be ZnS, Cd 1-x Zn x S or other suitable materials. A buffer layer can also be deposited between CdS and the TCO conducti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0224H01L31/0296H01L31/18
CPCH01L31/0224H01L31/022441H01L31/0296H01L31/18H01L31/1864Y02P70/50
Inventor 徐丽娟周洁曹彦斌
Owner ADVANCED SOLAR POWER HANGZHOU