TWI644803B - Screen structure of finger electrode for screen printing solar cell and manufacturing method thereof - Google Patents

Abstract

The invention provides a screen structure, wherein the finger electrode for screen printing a solar cell comprises: a mesh cloth, the mesh cloth 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, and the plurality of weft threads Each of the plurality of warp threads; an emulsion layer coated and formed on the mesh; and a plurality of finger electrode pattern openings, the plurality of finger electrode pattern openings being formed on the emulsion layer; wherein each of the plurality of weft lines Having a first end point and a second end point, each of the plurality of weft lines connecting at least two warp threads in the plurality of warp threads by the first end point and the second end point, and each of the plurality of weft lines and each of the plurality of warp lines One formed angle is a non-right angle; in addition, the present invention also provides a method for fabricating a screen structure for a finger electrode of a screen printed solar cell.

Description

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

The invention relates to a printing screen structure, in particular to a method for fabricating a screen structure of a finger electrode for screen printing solar cells.

Solar energy is an inexhaustible source of renewable energy for human beings. It is also a clean energy source and does not cause 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 germanium solar cells is to make very fine electrodes on the front and back sides of the germanium wafers, which are exported from the cell. This metallization process is usually done by printing screen technology. The printing process starts from the placement of the crucible wafer onto the printing table. A very fine printing mesh is fixed on the frame and placed above the crucible wafer. The printing mesh encloses the area other than the solar cell electrode pattern by the polymer material. In order to allow the conductive paste to pass. The distance between the germanium wafer and the printed screen is strictly controlled. Since the front side of the solar cell requires a thinner metal wire, the mesh used for printing the front side of the solar cell has a mesh (composed of a plurality of warp and weft) which is usually much smaller than that used for back printing, and then a proper amount of pulp is used. The material is placed on the screen, and the slurry is applied with a doctor blade to uniformly fill the mesh, and the blade is pressed into the silicon wafer through the screen mesh during the moving process.

The structure of the plurality of finger electrodes of the solar cell is as fine as possible, so that the plural opening patterns of the plurality of finger electrodes for screen printing solar cells are also progressing toward a finer and finer direction. However, the finer the opening pattern (printing line) is, the more the ink is affected by the warp and weft, especially at the intersection of the warp and weft. Therefore, in the prior art, a plurality of opening patterns are disposed in parallel with the warp to reduce the chance that the plurality of opening patterns pass through the intersection of the warp and the weft. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing the screen structure of a finger electrode for screen printing a solar cell in the prior art. Referring to FIG. 1 , the screen 1 in the prior art includes a frame 10 , and then the plurality of wefts 12 and the plurality of warp threads 14 are fixed to the frame 10 and tightened to form a mesh 16 on the frame 10 . . Next, an emulsion layer 18 is applied and formed on the mesh 16, and finally a plurality of opening patterns 28 are formed on the emulsion layer 18, and the plurality of opening patterns 28 are parallel to the plurality of warp threads 14 to reduce the plurality of opening patterns 28 through the plurality of wefts 12 The opportunity of the intersection of the plurality of warp threads 14 and the plurality of opening patterns 28 are the plurality of finger electrodes for screen printing solar cells.

Although the method of arranging the plurality of opening patterns 28 in parallel with the plurality of warp threads 14 can actually screen the finer finger electrodes, since in the screen 1, the plurality of opening patterns 28 and the plurality of weft lines 12 are perpendicular to each other when The ink screens the finger electrodes through the plurality of opening patterns 28, and when the ink passes through the plurality of wefts 12, the resistance of the ink from the plurality of wefts 12 is large, so more ink is needed to cause the finger electrodes to be screen printed. The impedance will increase, which in turn affects the power generation efficiency of the solar cell. In addition, in the screen structure for screen printing solar cells, when the plurality of jumper electrode patterns are parallel to the plurality of weft lines, the printing breaks easily.

Therefore, it is necessary to provide a new screen structure such that the complex warp threads and the complex weft threads are not perpendicular to each other. When the plurality of opening patterns in the screen are arranged in parallel with the plurality of warp threads, the plurality of opening patterns and the plurality of weft lines are not perpendicular to each other. In this way, when the ink passes through the plurality of opening patterns to screen the finger electrodes, and when the ink passes through the plurality of weft lines, the ink receives less resistance from the plurality of weft lines, and the screen printed electrode has a higher height. Power generation efficiency.

In view of the above disadvantages of the prior art, the main object of the present invention is to provide a screen structure for finger electrodes of screen printing solar cells, comprising: a mesh cloth 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 cloth; and a plurality of finger electrode pattern openings are formed, and the plurality of finger electrode pattern openings are formed On the emulsion layer, each of the plurality of finger electrode pattern openings is disposed in an interval formed by any two adjacent warp threads; wherein each of the plurality of weft lines has a first end point and a second end point, Each of the plurality of weft lines connects at least two of the plurality of warp threads by the first end point and the second end point, and each of the plurality of weft lines forms an angle that is non-right angle with each of the plurality of warp lines.

Preferably, each of the plurality of weft threads has a straight line shape and an included angle of any one of 0 to 89 degrees.

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

Preferably, each of the plurality of weft lines has a circular arc shape, and each of the weft lines forms an angle with each of the warp threads as each of the circular arc lines at the first end point or the second end The angle formed by the line of the endpoint and the corresponding warp of the warp, the angle being any one of 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 interconnected, and the jumper electrode pattern The opening and the plurality of latitude lines are not parallel to each other.

The invention also provides a method for fabricating a screen structure for a finger electrode of a screen printing solar cell, comprising the steps of: forming a plurality of warp threads on a metal plate, each of the plurality of warp threads being parallel to each other; Forming a plurality of weft lines on the flat plate, each of the plurality of weft lines connecting the plurality of warp threads, wherein each of the plurality of weft lines has a first end point and a second end point, each of the plurality of weft lines being by the first end point and the second end The end point connects at least two warp threads in the plurality of warp threads; each of the plurality of weft lines is formed at an angle different from each of the plurality of warp threads, and a mesh is formed by the plurality of warp threads and the plurality of weft threads; Coating and forming an emulsion layer; and forming a plurality of finger electrode patterns opening on the emulsion layer, wherein each of the plurality of finger electrode pattern openings is disposed in an interval formed by any two adjacent warp threads.

Preferably, the shape of each of the plurality of weft lines is set to be a straight line, and an angle of any one of 0 to 89 degrees is set.

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

Preferably, the shape of each of the plurality of weft lines is a circular arc line, and an angle formed between each of the weft lines and each of the warp threads is an arc of each of the first end points or the first The angle formed by the line of the two endpoints and the corresponding warp of the warp, the angle being any one of 0 to 89 degrees.

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

Furthermore, the method for fabricating the screen structure of the finger electrode for screen printing solar cells of the present invention further includes the step of forming a jumper electrode pattern opening on the emulsion layer, wherein the jumper electrode pattern opening and the complex finger The electrode pattern openings are connected to each other, and the jumper electrode pattern opening and the plurality of weft lines are not parallel to each other.

Other objects, advantages and novel features of the invention will be apparent from

Reference will now be made in detail to the exemplary embodiments illustrated in the drawings All figures are represented by the same element symbols as the same or similar parts. Please note that these drawings are drawn in simplified form and are not drawn to exact scale.

2 is a schematic view for explaining a mesh structure of a finger electrode for screen printing a 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 2 for finger electrodes of screen printing solar cells 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 is connected to the plurality of warp threads 20. As can be seen from FIG. 2, each of the plurality of wefts 22 has a first end point 221 and a second end point 223. Each of the plurality of weft lines 22 is connected by a first end point 221 and a second end point 223. At least two warp threads 20 in the line 20, and each of the plurality of weft threads 22 forms an angle d1 with each of the plurality of warp threads 20, and the angle d2 is a non-right angle. It should be understood that in the first embodiment of the present invention, each of the plurality of wefts 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 2 Any two of the warp threads 20.

Referring again to FIG. 2, the shape of the plurality of wefts 22 is a straight line (also referred to 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 plurality of wefts 22 form a zigzag pattern in the mesh 2. shape. Regarding the angle d1 and the angle d2, specifically, the angle d1 and the angle d2 are any one of 0 to 89 degrees, preferably, the angle d1 and the angle d2 are one of 22.5 degrees, 30 degrees, and 45 degrees. And the angle d1 and the angle d2 may be the same angle. It should be understood that the oblique line direction with respect to the complex weft 22 is for explaining the oblique line in Fig. 2 of the present invention, and the above oblique direction cannot be used to define the mesh structure of the present invention.

In the first embodiment of the present invention, the mesh 2 including the plurality of wefts 22 having oblique lines may be formed on a metal plate by an electroforming process, an etching process or a laser cutting process. Moreover, 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 view for explaining a screen structure of a finger electrode for screen printing a solar cell according to a first embodiment of the present invention. Referring to FIG. 3, in the first embodiment of the present invention, an emulsion layer 24 is coated and formed on the mesh 2, and then the alignment is performed by the alignment of the film, the laser cutting alignment or the ultraviolet light exposure line. One of the plurality of finger-shaped electrode pattern openings 26 is formed on the mesh 2, and the plurality of finger-shaped electrode pattern openings 26 are disposed in the interval formed by any two adjacent warp wires 20. Further, the plurality of finger electrodes are formed. The pattern opening 26 is disposed in the interval formed by any two adjacent warp threads 20 and is parallel to the plurality of warp threads 20. As can be seen from FIG. 3, the plurality of wefts 22 and the plurality of warp threads 20 are not perpendicular to each other, so when the plurality of finger-like electrode pattern openings 26 are disposed in parallel with the plurality of warp threads 20, the ink passes through the plurality of opening patterns 26 In the case of the electrode, the difference in height of the ink passing through the plurality of wefts 20 is small, so that the ink is more easily inked, and the impedance of the finger electrode printed on the screen is relatively reduced, and the finger print of the screen is printed. The electrode has a high power generation efficiency.

Figure 4 is a schematic view showing the cross-sectional structure of the arrow in Figure 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 warp threads 20 are formed. Each one is parallel.

FIG. 5 is a schematic view for explaining a screen structure of a jumper electrode for screen printing solar cells according to another embodiment of the present invention. Referring to FIG. 5, in another embodiment of the present invention, a jumper electrode may be further formed on the emulsion layer 24 of the mesh 2 by one of the alignment of the negative film, the alignment of the laser cutting, or the alignment of the ultraviolet light exposure line. The pattern opening 27, the jumper electrode pattern opening 27 and the plurality of finger electrode pattern openings 26 are interconnected, and the jumper electrode pattern opening 27 is a jumper electrode for use in screen printing solar cells. The function of the jumper electrode is that if one of the plurality of finger-shaped structure electrodes in the solar cell is broken, the jumper electrode can be connected to other channels (for example, other finger-like structure electrodes) to collect current.

In a conventional screen structure for a jumper electrode for a screen printed solar cell, generally the jumper electrode pattern opening in the screen is parallel to the plurality of weft lines, and the positions of the two overlap, so that when the ink passes When the jumper electrode pattern is opened, the print breakage is likely to occur due to the influence of the weft. However, as can be seen from FIG. 5 of the present invention, the jumper electrode pattern opening 27 and the plurality of weft lines 22 are not parallel to each other, so when the ink passes through the complex jumper electrode pattern opening 27 to screen the jumper electrode, the screen printed jumper electrode It is not easy to cause print breaks in the process.

The mesh structure of the finger electrode for screen printing solar cells of the present invention can also be presented in other structures. The other structure of the mesh structure for finger electrodes of screen printing solar cells provided by the present invention will now be described in detail. The way in which the structure is presented. It should be understood that in other kinds of mesh structures, the emulsion layer formed on the mesh and the plurality of finger electrode pattern openings formed on the emulsion layer are the same as those shown in FIGS. 3 and 4, so The emphasis in this paper is to illustrate the structure of other kinds of mesh fabrics, and the emulsion layer structure will be omitted in FIGS. 6-9 for convenience of explanation.

Figure 6 is a schematic view for explaining a mesh structure of a finger electrode for screen printing a solar cell according to a second embodiment of the present invention. Referring to FIG. 6, in a second embodiment of the present invention, a mesh 5 for finger electrodes for screen printing 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. Each of the wefts 52 is connected to a plurality of warp threads 50. As can be seen from Figure 5, each of the plurality of weft threads 52 has a first end point 521 and a second end point 523, each of the plurality of weft lines 52 being by the first end The point 521 and the second end point 523 are connected to at least two of the plurality of warp threads 50, and the angle d3 and the angle d4 formed by each of the plurality of weft lines 52 and each of the plurality of warp threads 50 are non-right angles. It should be understood that in the second embodiment of the present invention, each of the plurality of wefts 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 coupled to the mesh 5 Any two warp threads 50.

Referring again to FIG. 6, the shape of the plurality of wefts 52 is a straight line (also referred to 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 plurality of wefts 52 form a cross net in the mesh 5. Structure. Regarding the angle d3 and the angle d4, specifically, the angle d3 and the angle d4 are any one of 0 to 89 degrees. Preferably, the angle d3 and the angle d4 are one of 22.5 degrees, 30 degrees, and 45 degrees. And the angle d3 and the angle d4 may be the same angle. It should be understood that the oblique line direction with respect to the complex weft 52 is for explaining the oblique line in Fig. 5 of the present invention, and the above oblique direction cannot be used to define the mesh structure of the present invention.

Figure 7 is a schematic view for explaining a mesh structure of a finger electrode for screen printing a solar cell according to a third embodiment of the present invention. Referring to FIG. 7, in a third embodiment of the present invention, a mesh 6 for finger electrodes for screen printing solar cells 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. Each of the wefts 62 is connected in a geometrical structure to a plurality of warp threads 60. As can be seen from Figure 6, each of the plurality of weft threads 62 has a first end point 621 and a second end point 623, each of which is borrowed by a plurality of weft lines 62. At least two warp threads 60 of the plurality of warp threads 60 are connected by the first end point 621 and the second end point 623, and an angle d5 and an angle d6 formed by each of the plurality of weft lines 62 and each of the plurality of warp threads 60 are non-right angles. . It should be understood that in the third embodiment of the present invention, each of the plurality of wefts 62 is connected to two adjacent warp threads 60, but in other embodiments of the present invention, each of the plurality of weft threads 62 may be coupled to the mesh 6. Any two of the warp threads 60.

Referring again to FIG. 7, the shape of the plurality of wefts 62 is a straight line (also referred to 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 plurality of wefts 62 are on the plurality of warps 60 of the mesh 6. A staggered arrangement is presented. Regarding the angle d5 and the angle d6, specifically, the angle d5 and the angle d6 are any one of 0 to 89 degrees. Preferably, the angle d5 and the angle d6 are one of 22.5 degrees, 30 degrees, and 45 degrees. And the angle d5 and the angle d6 may be the same angle. It should be understood that the oblique direction of the above-mentioned complex weft 62 is for explaining the oblique line in Fig. 6 of the present invention, and the above oblique direction cannot be used to define the mesh structure of the present invention.

Figure 8 is a schematic view for explaining a mesh structure of a finger electrode for screen printing a solar cell according to a fourth embodiment of the present invention. Referring to FIG. 8, in a fourth embodiment of the present invention, a mesh 7 for finger electrodes for 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. Each of the weft lines 72 includes a first end point 721 and a second end point 723, and each of the plurality of weft lines 72 connects the plurality of warp threads 70 by the first end point 721 and the second end point 723. As can be seen from FIG. 7, each of the plurality of wefts 72 has a circular arc shape, and each of the plurality of wefts 72 having a circular arc shape includes a tangent 725 at the first end point 721 or at the second end point 723. The tangent line 727, and the tangent line 725 and the tangent line 727 form an angle d7 with each of the plurality of warp threads 70, and the included angle d7 is a non-right angle.

Referring again to FIG. 8, with respect to the included angle d7, specifically, the included angle d7 is any one of 0 to 89 degrees, and preferably, the included angle d7 is one of 22.5 degrees, 30 degrees, and 45 degrees. It should be understood that although FIG. 7 is a circular arc shape showing an upward convex shape, the plurality of weft threads 72 may be disposed in a circular arc shape that protrudes downward.

Figure 9 is a schematic view for explaining a mesh structure of a finger electrode for screen printing a 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 8 for a finger electrode for screen printing a 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. Each of the wefts 82 includes a first end point 821 and a second end point 823, each of which is coupled to the plurality of warp threads 80 by a first end point 821 and a second end point 823. As can be seen from FIG. 8, each of the plurality of wefts 82 has a circular arc shape, and each of the plurality of weft threads 82 having a circular arc shape includes a tangent line 825 at the first end point 821 or at the second end point 823. The tangent line 827, and the tangent line 825 and the tangent line 827 form an angle d8 with each of the plurality of warp threads 80, and the included angle d8 is a non-right angle.

Referring again to FIG. 9, the plurality of weft threads 82 are arc-shaped shapes that protrude upward and arc shapes that protrude downward. It is worth mentioning that, with respect to the angle d8, whether it is an upwardly convex circular shape or a direction The downwardly convex circular arc shape, specifically, the included angle d8 is any one of 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 FIG. 6 to FIG. 9 can be formed by using an electroforming process, an etching process, or a laser cutting process on a metal plate, including a diagonal line or a circular arc shape. The mesh of the complex latitude of the structure.

The invention also provides a method for fabricating a screen structure of a finger electrode for screen printing solar cells, and FIG. 10 is a flow chart for explaining a network of finger electrodes for screen printing solar cells of the invention. Version structure production process. Referring to FIG. 10, the screen 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. Then, in step S903, a plurality of weft lines are formed on the metal flat plate, and each of the weft lines is disposed to connect the warp threads.

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

In addition, in the method for fabricating the screen structure of the finger electrode for screen printing solar cells of the present invention, further comprising the step of forming a jumper electrode pattern opening on the emulsion layer, the step may be before step S909 or Then implemented. The jumper electrode pattern opening is interconnected with the finger electrode pattern openings, 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 weft lines may be set to a straight line, and the angle may be set to any one of 0 to 89 degrees. Preferably, the angle is 22.5. One of degrees, 30 degrees, and 45 degrees.

Furthermore, in the above manufacturing method, each of the weft lines may be shaped as a circular arc line, each of the circular arc lines including a line at the first end point or the second end point. And the tangential line forms an angle with each of the warp threads, and the included angle is any one of 0 to 89 degrees. Preferably, the angle is one of 22.5 degrees, 30 degrees, and 45 degrees. .

Further, in the above-described fabrication method of the present invention, a mesh comprising a plurality of wefts in the shape of a straight line or an arcuate line can be produced by an electroforming process, an etching process or a laser cutting process.

It can be seen from the above that the present invention successfully provides a screen structure for a finger electrode of a screen printing solar cell and a manufacturing method thereof. The plurality of weft lines in the screen structure of the present invention are in the shape of a straight line or a circular arc. The complex warp is connected, and each of the plurality of wefts forms an angle with each of the plurality of warp threads, so that the plurality of wefts and the plurality of warp threads are not perpendicular to each other. Therefore, when the plurality of finger electrode pattern openings in the screen are disposed in parallel with the plurality of warp threads, and the ink passes through the plurality of slit patterns to screen the finger electrodes, the portion of the ink passing through the plurality of weft lines is subjected to resistance from the plurality of weft lines. Smaller, the ink is easier to be inked, and the impedance of the finger-printed electrode printed on the screen is relatively reduced, and the finger-printed electrode printed on the screen has higher power generation efficiency.

In describing a representative example of the invention, the present specification has been presented as a specific sequence of steps of the method and/or procedure of the invention. However, to some extent, the method or program does not rely on the specific order of steps set forth herein, and the method or program should not be limited to the particular order of the steps described. As will be appreciated by those skilled in the art, other sequences of steps are also possible. Therefore, the specific order of steps set forth in this specification should not be construed as limiting the scope of the claims. In addition, the scope of the patent application of the method and/or procedure of the present invention should not be limited to the performance of the steps in the order presented, and those skilled in the art can immediately understand that the order can be changed and still maintain the spirit of the present invention. Within the scope.

Those skilled in the art should be aware that changes can be made to the above examples without departing from the broad inventive concepts. Therefore, it is understood that the invention is not limited to the specific examples of the invention, and is intended to cover the modifications of the invention and the scope of the invention as defined by the appended claims.

1‧‧‧Web Edition

10‧‧‧ net frame

12‧‧‧Weft

14‧‧‧ warp

16‧‧‧Mesh

18‧‧‧Layer layer

28‧‧‧Open pattern

2, 5, 6, 7, 8‧‧‧ mesh

20, 50, 60, 70, 80‧‧‧ warp

22, 52, 62, 72, 82‧‧‧ weft

24‧‧‧Layer layer

26‧‧‧Finger electrode pattern opening

27‧‧‧Jumper electrode pattern opening

221, 521, 621, 721, 821‧‧‧ first endpoint

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

725, 727, 825, 827 ‧ ‧ tangent

D1, d2, d3, d4, d5, d6, d7, d8‧‧‧ tangential angle

S901-S909‧‧‧Steps

The foregoing summary of the preferred embodiments of the invention, as well as For the purposes of illustrating the invention, various examples are now shown in the drawings. However, it should be understood that the invention is not limited to the precise arrangements and devices disclosed.

1 is a schematic structural view illustrating a printing screen in the prior art; FIG. 2 is a schematic view showing a structure of a mesh for a finger electrode of a screen printing solar cell according to a first embodiment of the present invention; FIG. 4 is a schematic cross-sectional structural view of the arrow in FIG. 3 of the present invention; FIG. 5 is a schematic view showing a network for explaining another embodiment of the present invention; FIG. 6 is a schematic view showing the structure of a mesh of a finger electrode for screen printing a solar cell according to a second embodiment of the present invention; FIG. 7 is a view showing a third embodiment of the present invention; FIG. 8 is a schematic view showing the structure of a mesh for a finger electrode of a screen printing solar cell according to a fourth embodiment of the present invention; FIG. 9 is a schematic view showing a mesh structure of a finger electrode for screen printing a solar cell according to a fourth embodiment of the present invention; A schematic view of a mesh structure of a finger electrode for screen printing solar cells according to a fifth embodiment of the present invention; and FIG. 10 is a view illustrating a mesh for finger electrodes of a screen printing solar cell of the present invention. Production structures flowchart.

Claims (6)

A screen structure for finger-printing electrodes of a screen printing solar cell, comprising: a mesh cloth composed of a plurality of warp threads and a plurality of weft threads, each of the warp threads being parallel to each other, the weft lines Each of the warp threads; an emulsion layer coated and formed on the mesh; and a plurality of finger electrode pattern openings, the finger electrode pattern openings being formed on the emulsion layer, and Each of the finger electrode pattern openings is disposed in an interval formed by any two adjacent warp threads; wherein each of the weft lines has a first end point and a second end point, each of the weft lines Connecting at least two of the warp threads by the first end point and the second end point, and each of the weft lines forms an angle with each of the warp threads is a non-right angle, wherein The shape of each of the equal latitude lines is a circular arc line, and the angle formed between each of the latitude lines and each of the warp threads is each of the circular arc lines at the first end point or the second The line of the endpoint and the corresponding meridian in the warp Angle, which angle is any value of 0 to 89 degrees. The screen structure according to claim 1, wherein the included angle is one of 22.5 degrees, 30 degrees, and 45 degrees. The screen structure of claim 1, further comprising a jumper electrode pattern opening 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 fabricating a screen structure for a finger electrode for screen printing a solar cell, comprising the steps of: forming a plurality of warp threads on a metal plate, each of the warp threads being parallel to each other; on the metal plate Forming a plurality of weft lines, each of the weft lines connecting the warp threads, wherein each of the weft lines has a first end point and a second end point, each of the weft lines being by the first end point And the second end point is connected to at least two of the warp threads; the angle formed by each of the weft lines and each of the warp threads is a non-right angle, and the warp threads and the same The weft line constitutes a mesh cloth; an emulsion layer is coated and formed on the mesh cloth; and a plurality of finger electrode patterns are formed on the emulsion layer, wherein each of the finger electrode pattern openings is disposed on any two An interval formed by adjacent warp threads, wherein each of the weft lines is shaped as a circular arc line, and the angle formed between each of the weft lines and each of the warp threads is the arc Each of the lines is at the first endpoint An angle formed by the second endpoint of the line corresponding to all of these warp in the warp, the included angle for any value of 0 to 89 degrees. The method for fabricating a screen structure for a finger-shaped structure electrode for screen printing solar cells according to claim 4, wherein the included angle is one of 22.5 degrees, 30 degrees, and 45 degrees. The method for fabricating a screen structure for a finger-shaped structure electrode for screen printing solar cells according to claim 4, further comprising the step of forming a jumper electrode pattern opening on the emulsion layer, wherein the jump The wire electrode pattern openings are interconnected with the finger electrode pattern openings, and the jumper electrode pattern openings are not parallel to the weft lines.