KR101653418B1

KR101653418B1 - substrate for solar cell with alignment hole and method for alignment of substrate using the same

Info

Publication number: KR101653418B1
Application number: KR1020110008453A
Authority: KR
Inventors: 이규민
Original assignee: 현대중공업 주식회사
Priority date: 2011-01-27
Filing date: 2011-01-27
Publication date: 2016-09-01
Also published as: KR20120087021A

Abstract

The present invention relates to a solar cell substrate having an alignment hole capable of minimizing a process error by providing a through hole or an alignment hole at each corner of the solar cell substrate to utilize the alignment mark as a common alignment mark when the front surface and the back surface process of the substrate proceed, A method of aligning a solar cell substrate according to the present invention includes aligning a plurality of alignment holes passing through a substrate in the solar cell substrate, The coordinate information of the alignment hole is recognized and the coordinate information of each alignment hole is recognized in a state that the second surface faces upward and then the coordinate information of the first surface and the second surface are compared. Information is coincident with the coordinate information of the second surface.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell substrate having an alignment hole and a method of aligning a solar cell substrate using the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell substrate having an alignment hole and a method of aligning the solar cell substrate using the same. More specifically, the solar cell substrate is provided with through holes The present invention relates to a solar cell substrate having an alignment hole capable of minimizing a process error by utilizing the alignment mark common to the solar cell substrate and an alignment method of the solar cell substrate using the same.

A solar cell is a core element of solar power generation that converts sunlight directly into electricity. Basically, it is a diode made of p-n junction. When the solar light is converted into electricity by the solar cell, when sunlight is incident on the pn junction of the solar cell, an electron-hole pair is generated, and the electric field moves the electrons to the n layer and the holes to the p layer Photovoltaic power is generated between the pn junctions, and when both ends of the solar cell are connected to each other, a current flows and the power can be produced.

A solar cell can be roughly classified into a bulk solar cell using a silicon wafer and a thin film solar cell formed by laminating a thin film layer on a transparent substrate. A bulk solar cell using a silicon wafer basically includes an n-type semiconductor layer and a p- And a semiconductor layer. In the bulk solar cell, an electrode layer is provided on both sides of a silicon wafer. Depending on the arrangement of the electrode and the emitter layer, a double-sided electrode type, an MWT (metal wrap through) type, an EWT (emitter wrap through) ) Type.

On the other hand, as the electrode layer is provided on both surfaces of the silicon wafer, that is, the solar cell substrate, the electrode layer forming process is performed on the front surface and the rear surface of the solar cell substrate, respectively. Usually, the electrode layer forming process is performed on the front surface (or the rear surface), and then the substrate is turned upside down and the electrode layer forming process is performed on the rear surface (or the front surface). In this case, if the substrate is the front surface and the rear surface, the same alignment condition must be maintained to ensure process reliability.

A conventional method of aligning a substrate will now be described. As shown in FIG. 1, the solar cell substrate has a rectangular shape, and each corner is processed in the form of a chamfer. The solar cell substrate has a portion where the extension lines of two adjacent sides intersect, that is, imaginary vertices A, B, ) Is used as an alignment mark.

However, since the solar cell substrate is not a perfect square shape, there is a problem that when the substrate is turned over, the virtual vertex is different from the initial state. For reference, FIGS. 2A to 2C exaggerate that the substrate is not square. That is, even though the position A of the initial state (see FIG. 2A) and the position of the B` point (the relation of BA`, CD`, DC`) after reversing (see FIG. 2B) (See Fig. 2 (c)).

In order to compensate for such a positional error, a process margin such as an enlargement of a pad area applied to an upper portion of the electrode layer is applied, so that a loss of material can not be avoided. In addition, in the case of a process requiring precision such as an MWT type solar cell, there is a possibility of occurrence of defects due to the above-mentioned positional error.

In order to solve such a problem, a method of marking an alignment mark on one side of a substrate has been proposed, but it can not be applied to both sides and thus can not be a fundamental solution.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a solar cell substrate in which a through hole or an alignment hole is provided at each corner of the solar cell substrate, And a method of aligning a solar cell substrate using the solar cell substrate.

According to an aspect of the present invention, there is provided a solar cell substrate having an alignment hole, the solar cell substrate including a plurality of alignment holes passing through the substrate, .

The number of the alignment holes is four, and the four alignment holes may correspond to each vertex of a virtual rectangle.

A method of aligning a solar cell substrate according to the present invention includes a plurality of alignment holes passing through a substrate on the solar cell substrate, recognizing coordinate information of the respective alignment holes with the first surface facing upward, The coordinate information of each of the alignment holes is recognized in a state in which the plane faces upward and then coordinate information of the first and second planes is compared and if the coordinate information of the first plane and the second plane is not coincident, .

The coordinate information of the first surface and the coordinate information of the second surface are made to coincide with each other by " a virtual arrangement diagram formed by connecting a plurality of alignment holes on the first surface " and &&Lt; / RTI >

The solar cell substrate having the alignment hole according to the present invention and the alignment method of the solar cell substrate using the same have the following effects.

Alignment marks common to both surfaces of the solar cell substrate, that is, four alignment holes passing through the substrate, are used to minimize misalignment of the substrate, and the alignment method at the time of misalignment is also facilitated.

1 is a plan view of a solar cell substrate;
FIGS. 2A to 2C are reference views for explaining a method of aligning a solar cell substrate according to the related art.
3 is a plan view of a solar cell substrate provided with an alignment hole according to an embodiment of the present invention.
4 is a reference view for explaining a method of aligning a solar cell substrate according to an embodiment of the present invention.

Hereinafter, a solar cell substrate having an alignment hole according to an embodiment of the present invention and a method of aligning a solar cell substrate using the same will be described in detail with reference to the drawings.

Referring to FIG. 3, the solar cell substrate 110 according to the present invention includes a plurality of alignment holes 111 passing through the substrate. The plurality of alignment holes 111 may be formed of two or more alignment marks. Hereinafter, the alignment holes 111 (a, b, c, and d) do.

3, a plurality of alignment holes 111 (a, b, c, d) passing through the substrate 110 are provided at each corner portion of the solar cell substrate. In addition, each of the alignment holes 111 provided at four corners may be located at each vertex of a virtual rectangle R, for example. That is, the virtual rectangle R is formed by the four alignment holes 111, and the four alignment holes 111 correspond to the vertexes of the virtual rectangle R. However, the present invention is not limited to the shape of the solar cell substrate in the technical idea that the imaginary rectangular shape is realized and the coordinate information of the alignment hole 111 can be recognized. It does not.

Each of the alignment holes 111 can be formed by laser irradiation. In the case of the MWT type solar cell, the process of forming the through-hole through laser irradiation is applied, so that the process of forming the alignment hole 111 can be performed at the same time when the through-hole process is performed.

Next, a method of aligning a solar cell substrate according to an embodiment of the present invention will be described.

First, a solar cell substrate 110 having a plurality of alignment holes 111 is prepared. As described above, the plurality of alignment holes 111 may be formed, and the coordinate information of each alignment hole 111 should be recognizable. Further, the plurality of alignment holes may be formed through a laser processing process or the like. Hereinafter, four alignment holes 111 (a, b, c, d) will be described as an embodiment.

The alignment holes 111 pass through the solar cell substrate 110 and are provided at respective corners of the solar cell substrate 110 and four alignment holes 111 (a, b, c, d) For example, it may be provided at a position corresponding to each vertex of the virtual rectangle R ₁ . The solar cell substrate 110 is provided on a flat base.

In this state, the position where the four alignment holes 111 are provided is recognized. The four alignment holes 111 can be recognized as one point on the coordinate, and the recognition and storage of the coordinate information of each alignment hole 111 can be performed by a separate computer system.

The process is performed on the first surface (front surface or back surface; hereinafter, the first surface is the front surface and the second surface is the rear surface) of the substrate 110 in a state in which the solar cell substrate 110 is prepared . In this case, the first surface may be an electrode layer forming step, and the electrode layer forming step may be screen printing. When the process for the first surface of the substrate 110 is completed, the substrate 110 is rotated 180 degrees in the vertical direction on the base of the plane. Thus, the first side of the substrate 110 is positioned on the backside and the second side of the substrate 110 is facing upwards.

In this state, the position of the four alignment holes 111 (a`, b`, c`, and d`) provided on the solar cell substrate 110, that is, coordinate information, is recognized (see FIG. Then, it is determined whether or not coincidence is detected with respect to the coordinate information recognized as the object of the first face, and when the coincidence is not made, the coordinate information measured for the first face and the second face are matched with each other. At this time, the task of matching the coordinate information can be referred to as a task of synchronizing the virtual layout. Here, the virtual layout is a layout in which a plurality of alignment holes are connected, and when the two alignment holes are provided, the virtual layout is a straight line. When three or more alignment holes are provided, the virtual layout is a triangle or a square.

Specifically, even if the coordinate information of the first surface and the coordinate information of the second surface are different from each other, the imaginary rectangle R ₁ formed by the four alignment holes (a, b, c, d) The virtual rectangle R ₂ > (the second rectangle) formed by the four (first, second, and third) alignment holes a, b, c, If the rims of the first rectangle R ₁ and the second rectangle R ₂ are made to coincide with each other, alignment with respect to the first and second surfaces can be precisely performed.

The operation of matching the rims of the first rectangle and the second rectangle becomes possible by finely adjusting the first rectangle or the second rectangle in a state where one of the four alignment holes 111 is aligned with the alignment hole 111 .

110: solar cell substrate 111: alignment hole

Claims

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A method of aligning a solar cell substrate having both sides of a first surface and a second surface,
A plurality of alignment holes penetrating the substrate are provided on the solar cell substrate,
The coordinate information of each of the alignment holes is recognized in a state in which the first surface faces upward and the coordinate information of each alignment hole is recognized in a state in which the second surface faces upward, The coordinate information of the first surface and the coordinate information of the second surface coincide with each other,
The coordinate information of the first surface and the coordinate information of the second surface are made to coincide with each other by " a virtual arrangement diagram formed by connecting a plurality of alignment holes on the first surface " and & Of the solar cell substrate are matched with each other.

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