Photovoltaic SE battery and preparation method thereof

A battery and photovoltaic technology, applied in the field of solar cells, can solve the problems of high cost of raw materials for silicon-based solar cells, high cost of production equipment, complex preparation process, etc., and achieve the effects of reducing reflectivity, improving service life, and reducing compounding.

Active Publication Date: 2020-04-10
晋能光伏技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing research results cannot solve the above problems at the same time. Silicon-based solar cells not only have ...

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  • Photovoltaic SE battery and preparation method thereof
  • Photovoltaic SE battery and preparation method thereof

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Experimental program
Comparison scheme
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Embodiment 1

[0068] Embodiment 1 of the present invention discloses a photovoltaic SE battery, including a back field electrode, a back electrode, a protective film, a passivation layer, a P-type silicon substrate, a PN junction layer, an SE laser propulsion layer, an oxidation repair layer, and an antireflection film layer , auxiliary grid electrode and main grid electrode;

[0069] On one side of the P-type silicon substrate, a PN junction layer and an SE laser propelling layer are sequentially grown, and the PN junction layer and the SE laser propelling layer form a plurality of parallel first grooves on the contact surface;

[0070] A passivation layer is arranged on the other side of the P-type silicon substrate, the outer surface of the passivation layer is connected to a protective film, a back electrode is arranged outside the protective film, and a back field electrode is arranged on the outer surface of the back electrode;

[0071] The SE laser propelling layer forms a plurality ...

Embodiment 2

[0102] Embodiment 2 of the present invention discloses a method for preparing a photovoltaic SE battery as disclosed in Embodiment 1, which specifically includes the following steps:

[0103] (1) Wash and make texture on one side of the P-type silicon substrate to form a textured layer, and diffuse on the surface of the textured layer to form a PN junction layer; the P-type silicon substrate is a square monocrystalline silicon wafer with a side length of 156.75-210 mm, The thickness is 180±20μm; the thinning amount of washing and making texture is 0.38~0.58g;

[0104] (2) Laser propulsion is carried out on the surface of the PN junction layer to form an SE laser propulsion layer; the propulsion depth of the laser propulsion is 0.1-0.15 μm, the length of the groove line formed by the propulsion is 155.25 mm, and the line width is 80-120 μm;

[0105] (3) Perform low-temperature annealing treatment on the SE laser propelling layer, and then perform high-temperature thermal oxygen...

Embodiment 3

[0114] Embodiment 3 of the present invention discloses a method for preparing a photovoltaic SE battery as disclosed in Embodiment 1, which specifically includes the following steps:

[0115] (1) Choose a 156.75x156.75mm single crystal silicon wafer with a thickness within the range of 180±20μm; clean the silicon wafer before making texture, remove the loss layer and impurities of the original wafer itself, and form a texture layer, in which the amount of thinning is controlled It is 0.4g; then it is placed in a diffusion device for diffusion junction to form a PN junction layer, and its surface resistance is between 125Ω.

[0116] (2) Carry out laser propulsion on the surface of the PN junction layer of the above-mentioned diffused single crystal silicon wafer, the propelling depth is 0.05 μm, the length of the groove line formed by propelling is 156.75 mm, and the line width is between 118 μm.

[0117] (3) Perform oxidation repair on the above-mentioned single crystal silico...

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Abstract

The invention discloses a photovoltaic SE battery. The photovoltaic SE battery comprises a back field electrode, a back electrode, a protective film, a passivation layer, a P-type silicon substrate, aPN junction layer, an SE laser propulsion layer, an oxidation repair layer, an antireflection film layer, an auxiliary grid line electrode and a main grid line electrode, and a high solar cell conversion rate can be obtained through mutual cooperation of the structures of all the layers. Moreover, the invention discloses a preparation method of the photovoltaic SE battery, the whole preparation process is simple, the raw materials are simple and easy to obtain, and the production cost can be obviously reduced.

Description

technical field [0001] The invention relates to the technical field of solar cells, and more specifically relates to a photovoltaic SE cell and a preparation method thereof. Background technique [0002] Solar energy is one of the currently developing energy sources in the world. Using photovoltaic cells to absorb the sun's light energy and convert it into electrical energy has great potential and prospects to replace traditional energy sources. In solar cells, silicon-based solar cells (ie, photovoltaic SE cells) account for 90% of the total market share, and the development of high-efficiency silicon-based solar cell technology is the key to improving the efficiency of solar cells. However, the high production cost and low efficiency of silicon-based batteries limit the development of silicon-based solar cells, resulting in a large difference between the use of solar energy and the use of traditional petrochemical energy. [0003] In order to overcome the problems that li...

Claims

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Application Information

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IPC IPC(8): H01L31/0216H01L31/0224H01L31/04H01L31/18
CPCH01L31/02167H01L31/02168H01L31/022425H01L31/04H01L31/1804Y02E10/547Y02P70/50
Inventor 王成王苗秦积海贺稷泽武建园秦大威薛少强贾慧君
Owner 晋能光伏技术有限责任公司
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