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Interdigital back contact type solar battery and preparation method thereof

A solar cell and back-contact technology, which is applied in circuits, electrical components, photovoltaic power generation, etc., can solve the problems of high cost of photolithography masks, complex structure, and difficult production, so as to reduce process steps, simple technology, The effect of reducing power generation costs

Inactive Publication Date: 2012-11-28
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

However, this structure is quite complex and difficult to produce
Because it requires multiple masks, photolithography masks are only suitable for small-area focused photovoltaic cells due to their high cost

Method used

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  • Interdigital back contact type solar battery and preparation method thereof
  • Interdigital back contact type solar battery and preparation method thereof
  • Interdigital back contact type solar battery and preparation method thereof

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Embodiment Construction

[0042] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0043] In this embodiment, the preparation method of the interdigitated back-contact solar cell of the present invention is further described in detail by taking an n-type substrate as an example.

[0044] Step: 201: select an N-type silicon wafer with a thickness of 100-500 microns, and polish it in a NaOH / KOH alkaline polishing solution with a mass fraction of 10%-50%, to remove the damaged layer on the surface;

[0045] Step 202: Perform standard cleaning on the silicon wafer, including: using No. 1 solution: NH 4 OH:H 2 o 2 :DI H 2 O=1:1:5 to remove organic matter, liquid No. 2: HCl:H 2 o 2 : DI H 2 O=1:1:6 to remove ionic impurities, No. 3 solution: DI H 2 O:HF=50:1 to remove surface oxides.

[0046] Step...

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Abstract

The invention relates to an interdigital back contact type solar battery and a preparation method thereof. The preparation method comprises the following steps of: performing surface treatment and cleaning on a silicon chip; manufacturing velvet on the silicon chip; performing oxidation treatment on the silicon chip to form a protective layer for protection; performing doping treatment on the upper surface of the silicon chip with the protective layer; forming interdigital p and n areas on the lower surface of the silicon chip with the protective layer through slurry screen printing and ion injection; sintering the silicon chip; removing remnant aluminum, and cleaning again; forming a passivation layer on the silicon chip; printing an interdigital metal electrode couple; and sintering the silicon chip again. According to the method, the solar battery is prepared on the basis of ion injection doping and aluminum paste screen printing technologies, the technologies are simple, the process steps are obviously reduced, and the combination with the conventional P-type silicon solar battery process of enterprises is facilitated, so that the photoelectric conversion efficiency is improved, the battery power generation cost is reduced, and the interdigital back contact type solar battery and the method are convenient to popularize and use.

Description

technical field [0001] The invention relates to a solar cell and a preparation method thereof, in particular to an interdigitated back-contact solar cell and a preparation method thereof. Background technique [0002] Most of the energy used today is fossil energy. However, this energy resource is limited and releases harmful substances during use. Climate change caused by greenhouse gas emissions and the possibility of military conflicts caused by the remaining limited fossil energy are two major problems facing mankind today. Therefore, the transformation from traditional fossil energy to clean renewable energy is the greatest challenge facing mankind at present. Photovoltaic solar energy is one of the green renewable energies, which has been widely valued by countries all over the world. At present, crystalline silicon cells still account for more than 90% of the market share in the world, and this market share will be maintained in recent years. However, the cost of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18B41M1/12H01L31/0224H01L31/0352
CPCH01L31/0682Y02E10/547H01L31/022441
Inventor 武德起贾锐陈晨孟彦龙刘新宇叶甜春
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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