TW201825299A - Screen plate structure for screen printing of interdigitated electrodes of solar cell and manufacturing method thereof capable of reducing impedance of interdigitated electrodes after screen printing to achieve high power generation efficiency - Google Patents

Abstract

The present invention provides a screen plate structure for screen printing of interdigitated electrodes of solar cell, which comprises: a screen fabric composed of a plurality of warp yarns and weft yarns, wherein each of the plurality of warp yarns is parallel to each other and each of the plurality of weft yarns is connected with the plurality of warp yarns; an emulsifier layer coated and formed on the screen fabric; and a plurality of interdigitated electrode pattern openings which are formed on the emulsifier layer. In which, each of the plurality of weft is provided with a first end and a second end and each of the plurality of weft yarns is connected with at least two of the plurality of warp yarns through the first end and the second end, and each of the plurality of weft yarns and each of the plurality of warp yarns are formed with an angle that is not an right angle. Furthermore, the present invention also provides a manufacturing method of screen plate structure for screen printing of interdigitated electrodes of solar cell.

Description

Screen structure for finger electrode of screen printing solar cell and manufacturing method thereof

The invention relates to a printing screen structure, in particular to a screen structure for finger electrodes of screen printing solar cells, and a method for manufacturing the screen structure.

Solar energy is an inexhaustible renewable energy source for human beings, and it is also a clean energy source without generating any environmental pollution. Solar cell technology is the fastest growing and most dynamic research area in recent years. One of the most critical steps in the production of crystalline silicon solar cells is to make very fine electrodes on the front and back of the silicon wafer, and to export the photoelectrons out of the cell. This metal coating process is usually done by printing screen technology. The printing process starts when the silicon wafer is placed on the printing table. A very fine printing mesh is fixed on the screen frame and placed above the silicon wafer. The printing mesh closes the other areas except the solar cell electrode pattern by the polymer material. So that the conductive paste can pass through. The distance between the silicon wafer and the printed screen must be strictly controlled. Since the front side of the solar cell requires finer metal wires, the screen openings (composed of multiple warp and weft threads) for screen printing on the front of the solar cell are usually much smaller than those used for back printing. The material is placed on the screen, and the slurry is smeared with a scraper to fill the mesh uniformly. The scraper squeezes the slurry onto the silicon wafer through the screen mesh during the movement.

The structure of the plurality of finger electrodes of the solar cell is as fine as possible. Therefore, the plurality of opening patterns of the plurality of finger electrodes for screen printing solar cells are also developing in an increasingly thinner direction. However, when the plural opening patterns (printed lines) are thinner, the ink is more affected by the warp and weft, especially at the intersection of the warp and weft. Therefore, in the conventional technology, there are currently provided a plurality of opening patterns arranged parallel to the warp threads to reduce the chance that the plurality of opening patterns pass through the intersection of the warp and weft threads. FIG. 1 is a schematic diagram for explaining a screen structure of finger electrodes for screen printing solar cells in the conventional technology. Please refer to FIG. 1, the screen 1 in the conventional technology includes a screen frame 10, and then a plurality of weft threads 12 and a plurality of warp threads 14 are fixed to the screen frame 10 and tightened to form a mesh cloth 16 on the screen frame 10. . Next, an emulsion layer 18 is coated and formed on the mesh 16, and finally, a plurality of opening patterns 28 are formed on the emulsion layer 18. The plurality of opening patterns 28 are parallel to the plurality of warp threads 14 to reduce the plurality of opening patterns 28 passing through the plurality of weft threads 12. Opportunities at the intersection of plural warp threads 14 and plural opening patterns 28 are plural finger electrodes for screen printing solar cells.

Although the method of setting the plurality of opening patterns 28 in parallel with the plurality of warp threads 14 can indeed print thinner finger electrodes, but in the screen plate 1, the plurality of opening patterns 28 and the plurality of weft threads 12 are perpendicular to each other, when The ink penetrates the plurality of opening patterns 28 through the screen-printed finger electrodes, and when the ink passes through the plurality of weft threads 12, the ink is more resistant to the resistance from the plurality of weft threads 12, so more ink needs to be used, causing the screen-printed finger electrodes The impedance will increase, which will affect the power generation efficiency of the solar cell. In addition, in the screen structure used for screen printing solar cells, when a plurality of jumper electrode patterns are parallel to a plurality of parallel lines, it is easy to cause a print disconnection.

Therefore, it is necessary to provide a new screen structure so that the complex warp and the complex weft are not perpendicular to each other. When the plurality of opening patterns in the screen are arranged parallel to the plurality of warp threads, the plurality of opening patterns and the plurality of weft threads are not perpendicular to each other. In this way, when the ink passes through the plural opening pattern screen printing finger electrodes, and when the ink passes through the plural weft threads, the resistance of the ink from the plural weft threads will be smaller, and the finger electrodes printed on the screen will have a higher resistance. Power generation efficiency.

In view of the shortcomings of the above-mentioned conventional technologies, the main object of the present invention is to provide a screen structure for finger electrodes of screen printing solar cells, which includes: a mesh cloth, which is composed of a plurality of warp threads and a plurality of weft threads. , Each of the plurality of warp threads is parallel to each other, each of the plurality of weft threads is connected to the plurality of warp threads; an emulsion layer is coated and formed on the mesh; and a plurality of finger electrode pattern openings are formed On the emulsion layer, and each of the plurality of finger electrode pattern openings is disposed in a space formed by any two adjacent warp threads; wherein each of the plurality of parallel threads has a first end point and a second end point, Each of the plurality of parallels is connected to at least two of the plurality of longitudes by a first end point and a second end point, and an angle formed by each of the plurality of parallels and each of the plurality of longitudes is not a right angle.

Preferably, the shape of each of the plurality of parallels is a straight line, and the included angle is any value from 0 to 89 degrees.

Preferably, the included angle is one of 22.5 degrees, 30 degrees, and 45 degrees.

Preferably, the shape of each of the plurality of parallels is a circular arc, and the angle formed between each of the parallels and each of the warp threads is each of the circular arcs at the first endpoint or the second The included angle formed by all the lines at the endpoints and the corresponding meridians of these meridians, the included angle is any value from 0 to 89 degrees.

Preferably, the included angle is one of 22.5 degrees, 30 degrees, and 45 degrees.

Furthermore, the screen structure of the present invention further includes a jumper electrode pattern opening, the jumper electrode pattern opening is formed on the emulsion layer, the jumper electrode pattern opening and the plurality of finger electrode pattern openings are connected to each other, and the jumper electrode pattern The opening is not parallel to the plural parallels.

The invention also provides a method for manufacturing a screen structure for finger electrodes of screen printing solar cells, which comprises the following steps: forming a plurality of warp threads on a metal flat plate, each of the plurality of warp threads is parallel to each other; A plurality of parallels are formed on the flat plate, and each of the multiples is connected to a plurality of warps. Each of the plurality of parallels has a first end point and a second end point. Each of the plurality of parallel lines is connected to the first end point and the second end point. The end points are connected to at least two of the plurality of meridians; the angle formed by each of the plurality of parallels and each of the plurality of parallels is set to a non-right angle, and a mesh is formed by the plurality of parallels and the parallels; An emulsion layer is coated and formed; and a plurality of finger electrode pattern openings are formed on the emulsion layer, wherein each of the plurality of finger electrode pattern openings is disposed in a space formed by any two adjacent meridians.

Preferably, the shape of each of the plurality of parallel lines is set to be a straight line, and the included angle is set to any value from 0 to 89 degrees.

Preferably, the included angle is one of 22.5 degrees, 30 degrees, and 45 degrees.

Preferably, the shape of each of the plurality of parallels is set as an arc, and the angle formed between each of the parallels and each of the warp threads is such that each of the arcs is at the first endpoint or the first The included angle formed by all the lines at the two ends and the corresponding meridian in these meridians, the included angle is any value from 0 to 89 degrees.

Preferably, the included angle is one of 22.5 degrees, 30 degrees, and 45 degrees.

Furthermore, the method for manufacturing a screen structure for finger electrodes of a screen-printed solar cell according to the present invention further includes a step of forming a jumper electrode pattern opening on the emulsion layer, wherein the jumper electrode pattern opening and a plurality of fingers The pattern electrode pattern openings are connected to each other, and the jumper electrode pattern openings are not parallel to each other.

Other objects, benefits and innovative features of the present invention will be apparent from the following detailed examples of the present invention together with the accompanying drawings.

Reference will now be made in detail to the examples shown in the accompanying drawings of the present invention. In all drawings, the same component symbols are used to represent the same or similar parts. Please note that the drawings are drawn in simplified form and are not drawn to exact scale.

FIG. 2 is a schematic diagram for explaining a mesh fabric structure of a finger electrode for a screen-printed solar cell according to a first embodiment of the present invention. Referring to FIG. 2, in the first embodiment of the present invention, the mesh cloth 2 for finger electrodes of a screen-printed solar cell includes a plurality of warp threads 20 and a plurality of weft threads 22. Each of the plurality of warp threads 20 is parallel to each other, and each of the plurality of weft threads 22 connects the plurality of warp threads 20. As can be seen from FIG. 2, each of the plurality of parallels 22 has a first endpoint 221 and a second endpoint 223, and each of the plurality of parallels 22 is connected to the plurality of warps through the first endpoint 221 and the second endpoint 223. At least two warp threads 20 among the lines 20, and an included angle d1 and an included angle d2 formed by each of the plurality of parallel threads 22 and each of the plurality of warp threads 20 are non-right angles. It should be understood that, in the first embodiment of the present invention, each of the plurality of weft threads 22 is connected to two adjacent warp threads 20, but in other embodiments of the present invention, each of the plurality of weft threads 22 may be connected to the mesh fabric 2 Any two of the warp threads 20.

Referring again to FIG. 2, the shape of the complex weft 22 is a straight line (also called a diagonal line), including a diagonal line from the upper left to the lower right and a diagonal line from the upper right to the lower left, so that the complex weft 22 forms a zigzag pattern in the mesh 2 shape. Regarding the included angle d1 and the included angle d2, specifically, the included angle d1 and the included angle d2 are any value from 0 to 89 degrees. Preferably, the included angle d1 and the included angle d2 are one of 22.5 degrees, 30 degrees, and 45 degrees. , And the included angle d1 and the included angle d2 can be the same angle. It should be understood that the above-mentioned oblique line direction of the complex weft line 22 is used to explain the oblique line in FIG. 2 of the present invention, and the above oblique line direction cannot be used to limit the mesh structure of the present invention.

In the first embodiment of the present invention, a mesh cloth 2 including a plurality of weft lines 22 in an oblique line can be fabricated on a metal flat plate by an electroforming process method, an etching process method, or a laser cutting process method. In addition, in other embodiments of the present invention, the diameters of the plurality of warp threads 20 and the plurality of weft threads 22 may be different.

FIG. 3 is a schematic diagram for explaining a screen structure of a finger electrode for screen printing solar cells according to the first embodiment of the present invention. Please refer to FIG. 3. In the first embodiment of the present invention, an emulsion layer 24 is coated and formed on the mesh fabric 2, and then the film alignment, laser cutting alignment, or UV exposure line alignment is used. One forms a plurality of finger-like electrode pattern openings 26 on the mesh 2, and the plurality of finger-like electrode pattern openings 26 are provided in the interval formed by any two adjacent warp threads 20, and moreover, the plurality of finger-like electrode The pattern opening 26 is provided in a space formed by any two adjacent warp threads 20 and is parallel to the plurality of warp threads 20. It can be seen from FIG. 3 that the plural weft threads 22 and the plural warp threads 20 are not perpendicular to each other. Therefore, when the plural finger electrode pattern openings 26 are arranged in parallel with the plural warp threads 20, the ink passes through the plural opening patterns 26 screen printing fingers. In the form electrode, the difference in height between the portion of the ink passing through the plurality of weft lines 20 will be smaller, making it easier for the ink to be discharged, and at the same time, the impedance of the finger electrode printed on the screen will be relatively reduced, and the finger pattern printed on the screen will be reduced. The electrode has high power generation efficiency.

FIG. 4 is a schematic diagram for explaining a cross-sectional structure at an arrow in FIG. 3 of the present invention. Referring to FIG. 4, it can be seen from the cross-sectional view at the arrow of FIG. 3 that the plurality of finger electrode pattern openings 26 are formed in the emulsion layer 24, and each of the plurality of finger electrode pattern openings 26 and the plurality of meridians 20 Every one is parallel.

FIG. 5 is a schematic diagram for explaining a screen structure of a jumper electrode for a screen-printed solar cell according to another embodiment of the present invention. Please refer to FIG. 5. In other embodiments of the present invention, one of negative film alignment, laser cutting alignment, or ultraviolet light exposure line alignment may be further used to form jumper electrodes on the emulsion layer 24 of the mesh 2. The pattern openings 27, the jumper electrode pattern openings 27 and the plurality of finger electrode pattern openings 26 are connected to each other. The jumper electrode pattern openings 27 are jumper electrodes used in screen printing solar cells. The function of the jumper electrode is that if one of the plurality of finger structure electrodes in the solar cell is disconnected, other channels (for example, other finger structure electrodes) can be connected by the jumper electrode to collect current.

In the traditional screen structure for the jumper electrodes of screen-printed solar cells, the openings of the jumper electrode pattern in the screen are usually parallel to the multiple parallel lines, and the positions of the two are overlapped. In this way, when the ink passes When the jumper electrode pattern is opened, it is easy to cause print disconnection due to the effect of the weft. However, it can be seen from FIG. 5 of the present invention that the jumper electrode pattern opening 27 and the complex weft line 22 are not parallel to each other. Therefore, when the ink passes through the plurality of jumper electrode pattern openings 27 to screen-print the jumper electrode, It is not easy to cause print disconnection during the process.

The mesh structure of the finger electrodes for screen-printed solar cells of the present invention can also be presented in other structures. Now, other details of the mesh fabric structure of the finger electrodes for screen-printed solar cells provided by the present invention will be described in detail. This structure is presented. It should be understood that, in other types of mesh fabric structures, the emulsion layer formed on the mesh fabric and the plurality of finger electrode pattern openings formed on the emulsion layer are the same as the structures shown in FIG. 3 and FIG. 4, so the following The focus of the text is to explain the structure of other types of mesh fabrics, and the emulsion layer structure will be omitted in FIGS. 6-9 for the convenience of description.

FIG. 6 is a schematic diagram for explaining a mesh cloth structure of a finger electrode for screen-printed solar cells according to a second embodiment of the present invention. Please refer to FIG. 6. In the second embodiment of the present invention, the mesh cloth 5 for finger electrodes of screen-printed solar cells includes a plurality of warp threads 50 and a plurality of weft threads 52. Each of the plurality of warp threads 50 is parallel to each other, and a plurality of Each of the parallels 52 is connected to a complex warp 50. As can be seen from FIG. 5, each of the parallels 52 has a first endpoint 521 and a second endpoint 523, and each of the parallels 52 has a first end via a first end. The point 521 and the second endpoint 523 are connected to at least two of the plurality of meridians 50, and an included angle d3 and an included angle d4 formed by each of the plurality of parallels 52 and each of the plurality of meridians 50 are non-right angles. It should be understood that, in the second embodiment of the present invention, each of the plurality of weft threads 52 is connected to two adjacent warp threads 50, but in other embodiments of the present invention, each of the plurality of weft threads 52 may be connected to the mesh fabric 5 Any two of the warp threads 50.

Referring again to FIG. 6, the shape of the complex weft 52 is a straight line (also known as a diagonal line), including a diagonal line from the upper left to the lower right and a diagonal line from the upper right to the lower left, so that the complex weft 52 forms a cross net in the mesh 5状 结构。 Like structure. Regarding the included angle d3 and included angle d4, specifically, the included angle d3 and included angle d4 are any value from 0 to 89 degrees. Preferably, the included angle d3 and included angle d4 are one of 22.5 degrees, 30 degrees, and 45 degrees. , And the included angle d3 and the included angle d4 can be the same angle. It should be understood that the above-mentioned oblique direction of the complex weft line 52 is used to explain the oblique line in FIG. 5 of the present invention, and the above-mentioned oblique line direction cannot be used to limit the mesh structure of the present invention.

FIG. 7 is a schematic diagram for explaining a structure of a mesh cloth for a finger electrode of a screen-printed solar cell according to a third embodiment of the present invention. Please refer to FIG. 7. In a third embodiment of the present invention, a mesh cloth 6 for finger electrodes of a screen-printed solar cell includes a plurality of warp threads 60 and a plurality of weft threads 62. Each of the plurality of warp threads 60 is parallel to each other, and a plurality of Each of the parallels 62 is connected to the complex meridian 60 in a geometric figure structure. As can be seen from FIG. 6, each of the parallels 62 has a first endpoint 621 and a second endpoint 623. At least two meridians 60 of the plurality of meridians 60 are connected by the first endpoint 621 and the second endpoint 623, and the included angle d5 and the included angle d6 formed by each of the plurality of parallels 62 and each of the plurality of meridians 60 are non-right angles . It should be understood that, in the third embodiment of the present invention, each of the plurality of parallel wefts 62 is connected to two adjacent warp threads 60, but in other embodiments of the present invention, each of the plurality of parallel wefts 62 may be connected to the mesh 6 Any two of the warp threads 60.

Referring again to FIG. 7, the shape of the complex weft 62 is a straight line (also known as a diagonal line), which includes a diagonal line from the upper left to the lower right and a diagonal line from the upper right to the lower left, so that the complex weft 62 is in the complex warp 60 of the mesh 6 In a staggered arrangement. Regarding the included angle d5 and included angle d6, specifically, the included angle d5 and included angle d6 are any value from 0 to 89 degrees. Preferably, the included angle d5 and included angle d6 are one of 22.5 degrees, 30 degrees, and 45 degrees. , And the included angle d5 and the included angle d6 can be the same angle. It should be understood that the above-mentioned oblique line direction of the complex weft line 62 is used to explain the oblique line in FIG. 6 of the present invention, and the above oblique line direction cannot be used to limit the mesh structure of the present invention.

FIG. 8 is a schematic diagram for explaining a mesh cloth structure of a finger electrode for screen-printed solar cells according to a fourth embodiment of the present invention. Referring to FIG. 8, in the fourth embodiment of the present invention, the mesh cloth 7 for finger electrodes of screen printing solar cells includes a plurality of warp threads 70 and a plurality of weft threads 72, each of the plurality of warp threads 70 is parallel to each other, and a plurality of Each of the latitudes 72 includes a first end point 721 and a second end point 723, and each of the plurality of latitude lines 72 is connected to the plurality of warp lines 70 by the first end point 721 and the second end point 723. As can be seen from FIG. 7, the shape of each of the plurality of parallel lines 72 is an arc, and each of the plurality of parallel lines 72 having an arc shape includes a tangent line 725 at the first end point 721 or a second end point 723. Each of the tangent lines 727, tangent lines 725 and tangent lines 727 and the plurality of meridian lines 70 form an included angle d7, and the included angle d7 is not a right angle.

Referring to FIG. 8 again, regarding the included angle d7, specifically, the included angle d7 is any value from 0 to 89 degrees. Preferably, the included angle d7 is one of 22.5 degrees, 30 degrees, and 45 degrees. It should be understood that although FIG. 7 illustrates a circular arc shape protruding upward, the plural wefts 72 may also be provided in a circular arc shape protruding downward.

FIG. 9 is a schematic diagram for explaining a mesh cloth structure of a finger electrode for a screen-printed solar cell according to a fifth embodiment of the present invention. Referring to FIG. 9, in a fifth embodiment of the present invention, a mesh cloth 8 for finger electrodes of a screen-printed solar cell includes a plurality of warp threads 80 and a plurality of weft threads 82, each of the plurality of warp threads 80 is parallel to each other, and a plurality of Each of the parallels 82 includes a first end 821 and a second end 823. Each of the plurality of parallels 82 is connected to the complex warp 80 through a first end 821 and a second end 823. As can be seen from FIG. 8, the shape of each of the plurality of parallel lines 82 is a circular arc, and each of the plurality of parallel lines 82 having a circular shape includes a tangent line 825 at the first end point 821 or a second end point 823. Each of the tangent lines 827, tangent lines 825 and tangent lines 827 and the complex warp 80 form an included angle d8, and the included angle d8 is not a right angle.

Referring again to FIG. 9, the complex parallel line 82 is a circular arc shape protruding upward and a circular arc shape protruding downward. It is worth mentioning that regarding the included angle d8, whether it is a circular arc shape protruding upward or The arc-shaped shape protruding downward, specifically, the included angle d8 is any value from 0 to 89 degrees, and preferably, the included angle d8 is one of 22.5 degrees, 30 degrees, and 45 degrees.

In addition, the method for forming the mesh structure shown in FIGS. 6 to 9 can be produced by using an electroforming process method, an etching process method, or a laser cutting process method on a metal flat plate, including a diagonal line or an arc shape. The structure of the mesh of a plurality of parallels.

The present invention also provides a method for manufacturing a screen structure for finger electrodes of screen-printed solar cells. FIG. 10 is a flowchart for explaining the screen of finger electrodes for screen-printed solar cells of the present invention. Edition structure production process. Referring to FIG. 10, the screen printing structure manufacturing process of the present invention includes steps S901-S909. First, in step S901, a plurality of warp threads are formed on a metal flat plate, and each of the warp threads is parallel to each other. In step S903, a plurality of wefts are formed on the metal flat plate, and each of the wefts is set to connect to the warp threads.

Next, in step S905, the included angle formed by each of the weft threads and each of the warp threads is set to a non-right angle, and a mesh is formed by the warp threads and the weft threads. Wherein, each of the parallels has a first end point and a second end point, and each of the parallels connects at least two of the warp lines through the first end point and the second end point. line. After the fabric is made, the process proceeds to step S907. In step S907, an emulsion layer is coated on the mesh cloth. Finally, in step S909, a plurality of finger electrode pattern openings are formed on the emulsion layer by using one of negative film alignment, laser cutting alignment or ultraviolet light exposure line alignment. Each of the finger electrode pattern openings is disposed in a space formed by any two adjacent warp threads.

In addition, in the method for manufacturing a screen structure for finger electrodes of a screen-printed solar cell according to the present invention, the method further includes a step of forming a jumper electrode pattern opening on the emulsion layer, which step may be performed before step S909 or Implemented later. The jumper electrode pattern opening and the finger electrode pattern openings are connected to each other, and the jumper electrode pattern opening and the weft lines are not parallel to each other.

It is worth mentioning that, in the above manufacturing method, the shape of each of the isoparallel lines can be set as a straight line, and the included angle is set to any value from 0 to 89 degrees. Preferably, the included angle is 22.5 Degree, 30 degrees, 45 degrees.

Furthermore, in the above-mentioned manufacturing method, the shape of each of the isoparallel lines may also be set as an arc line, and each of the arc lines includes all lines at the first end point or the second end point. , And the tangent and each of the meridians form the included angle, and the included angle is any value from 0 to 89 degrees, preferably, the included angle is one of 22.5 degrees, 30 degrees, and 45 degrees .

In addition, in the above-mentioned manufacturing method of the present invention, a mesh cloth including a plurality of weft threads having a straight or arc shape can be manufactured by an electroforming process method, an etching process method, or a laser cutting process method.

It can be known from the foregoing that the present invention successfully provides a screen structure for finger electrodes of screen printing solar cells and a manufacturing method thereof. The plurality of parallel lines in the screen structure of the present invention are in a straight shape or an arc shape. The plural meridians are connected, and the angle formed between each of the plural latitudes and each of the plural longitudes is not a right angle. In this way, the plural latitudes and the plural longitudes are not perpendicular to each other. Therefore, when the plurality of finger electrode pattern openings in the screen are set parallel to the plurality of warp threads, and the ink passes through the plurality of opening pattern screen printing finger electrodes, the portion of the ink passing through the plurality of weft threads is subject to resistance from the plurality of weft threads. It is small, which makes it easier to apply ink, and at the same time, the impedance of the finger electrodes printed on the screen is relatively reduced, and the finger electrodes printed on the screen have higher power generation efficiency.

In describing a representative example of the present invention, the present specification has proposed operating the method and / or program of the present invention as a specific sequence of steps. However, to a certain extent, the method or procedure does not rely on the specific sequence of steps presented herein, and the method or procedure should not be limited to the specific sequence of steps described. As the skilled artisan will appreciate, other sequences of steps are possible. Therefore, the specific order of steps presented in this specification should not be considered as limiting the scope of patent application. In addition, the scope of patenting for the methods and / or procedures of the present invention should not be limited to the effectiveness of the steps in the proposed sequence, and those skilled in the art can immediately understand that these sequences can be changed and still remain within the spirit and scope of the present invention. Within range.

Those skilled in the art should know that the above examples can be changed without departing from its broad inventive concept. Therefore, it should be understood that the present invention is not limited to the specific examples of the present disclosure, but is intended to cover modifications belonging to the spirit and scope of the present invention as defined by the respective claims.

1‧‧‧ Screen

10‧‧‧Net Frame

12‧‧‧ parallel

14‧‧‧Warp

16‧‧‧ Mesh

18‧‧‧ emulsion layer

28‧‧‧ opening pattern

2, 5, 6, 7, 8‧‧‧ mesh

20, 50, 60, 70, 80‧‧‧ warp

22, 52, 62, 72, 82‧‧‧ parallels

24‧‧‧Emulsion layer

26‧‧‧ Finger electrode pattern opening

27‧‧‧ Jumper electrode pattern opening

221, 521, 621, 721, 821

223‧‧‧, 523, 623, 723, 823‧‧‧ second endpoint

725, 727, 825, 827‧‧‧ tangent

d1, d2, d3, d4, d5, d6, d7, d8‧‧‧tangent angle

S901-S909‧‧‧step

When viewed in conjunction with the accompanying drawings, a better summary of the best examples of the present invention and the detailed description above can be better understood. In order to achieve the purpose of the present invention, each of the drawings depicts the presently preferred examples. It should be understood, however, that the present invention is not limited to the precise arrangements and equipment shown.

FIG. 1 is a schematic diagram illustrating the structure of a printing screen in a conventional technology; FIG. 2 is a schematic diagram illustrating the structure of a mesh cloth for finger electrodes for screen printing solar cells according to a first embodiment of the present invention; Schematic diagram of the screen structure of finger electrodes for screen printing solar cells according to an embodiment; FIG. 4 is a schematic diagram of the cross-section structure at the arrow in FIG. 3 illustrating the present invention; FIG. 5 is a schematic diagram of a screen for other embodiments of the present invention. Schematic diagram of the screen structure of the jumper electrode of the printed solar cell; Figure 6 is a schematic diagram of the structure of the mesh cloth for the finger electrode of the screen printed solar cell according to the second embodiment of the present invention; FIG. 8 is a schematic structural diagram of a mesh cloth for a finger electrode of a screen-printed solar cell according to a fourth embodiment of the present invention; FIG. 9 is a schematic diagram of a mesh cloth structure for a finger-type electrode for a screen-printed solar cell; Schematic diagram illustrating the structure of a mesh cloth for a finger electrode of a screen-printed solar cell according to a fifth embodiment of the present invention; and FIG. 10 is a diagram illustrating a mesh of the finger electrode for a screen-printed solar cell of the present invention Production structures flowchart.

Claims (12)

A screen structure for finger-type electrodes for screen printing solar cells, comprising: a mesh fabric composed of a plurality of warp threads and a plurality of weft threads, each of the warp threads being parallel to each other, and the weft threads Each connects the warp threads; an emulsion layer is coated and formed on the mesh; and a plurality of finger electrode pattern openings are formed on the emulsion layer, and these Each of the finger electrode pattern openings is disposed in a space formed by any two adjacent warp threads; wherein each of the weft threads has a first end point and a second end point, and each of the weft threads At least two of the warp threads are connected through the first end point and the second end point, and an included angle formed by each of the parallels and each of the warp threads is not a right angle. The screen structure according to item 1 of the scope of patent application, wherein the shape of each of the parallels is a straight line, and the included angle is any value from 0 to 89 degrees. The screen structure according to item 2 of the scope of patent application, wherein the included angle is one of 22.5 degrees, 30 degrees, and 45 degrees. As the screen structure described in item 1 of the scope of patent application, wherein the shape of each of the parallels is an arc, and the angle formed between each of the parallels and each of the warp threads is An included angle formed by all the lines of the arc line at the first endpoint or the second endpoint with the corresponding meridians in the meridians, the included angle is any value from 0 to 89 degrees. The screen structure according to item 4 of the scope of patent application, wherein the included angle is one of 22.5 degrees, 30 degrees, and 45 degrees. The screen structure according to item 1 of the scope of the patent application, further comprising a jumper electrode pattern opening, the jumper electrode pattern opening is formed on the emulsion layer, the jumper electrode pattern opening and the finger electrode patterns The openings are connected to each other, and the jumper electrode pattern openings are not parallel to the weft lines. A method for manufacturing a screen structure for finger electrodes of a screen-printed solar cell includes the following steps: forming a plurality of warp threads on a metal flat plate, each of the warp threads being parallel to each other; on the metal flat plate A plurality of parallels are formed, each of the parallels is connected to the longitudes, wherein each of the parallels has a first endpoint and a second endpoint, and each of the parallels passes through the first endpoint And the second end point connects at least two of the warp threads; setting an angle formed by each of the weft threads and each of the warp threads as a non-right angle, and by means of the warp threads and the The wefts constitute a mesh cloth; an emulsion layer is coated and formed on the mesh cloth; and a plurality of finger-like electrode pattern openings are formed on the emulsion layer, wherein each of the finger-like electrode pattern openings is provided at any two In the space formed by two adjacent warp threads. The method for manufacturing a screen structure for finger electrodes for screen printing solar cells as described in item 7 of the scope of the patent application, wherein the shape of each of the wefts is set to be a straight line, and the included angle is set to 0 to Any value from 89 degrees. According to the method for manufacturing a screen structure of a finger electrode for screen printing solar cells as described in item 8 of the scope of the patent application, the included angle is one of 22.5 degrees, 30 degrees, and 45 degrees. The method for manufacturing a screen structure for finger electrodes of screen-printed solar cells as described in item 7 of the scope of the patent application, wherein the shape of each of the wefts is an arc, and each of the wefts is an arc. The included angle formed between each of the meridians is formed by all the lines of the arc at the first endpoint or the second endpoint and the corresponding meridians of the meridians The included angle is any value from 0 to 89 degrees. According to the method for fabricating a screen structure of a finger electrode for screen printing solar cells as described in item 10 of the scope of patent application, the included angle is one of 22.5 degrees, 30 degrees, and 45 degrees. The method for manufacturing a screen structure for finger electrodes of screen-printed solar cells as described in item 7 of the scope of the patent application, further comprising the step of forming a jumper electrode pattern opening on the emulsion layer, wherein the jumper The electrode pattern openings are interconnected with the finger electrode pattern openings, and the jumper electrode pattern openings are not parallel to the weft lines.