TWI556455B - Solar cell, module comprising the same and method of manufacturing the same - Google Patents

Description

Solar battery, module thereof and manufacturing method thereof

The invention relates to a solar cell, a module thereof and a manufacturing method thereof, in particular to a twinned solar cell, a module thereof and a manufacturing method thereof.

Referring to Fig. 1, a known twinned solar cell mainly comprises: a battery body 91 for converting light energy into electrical energy, and a front electrode 92 and a back electrode (not shown) for conducting current. The front electrode 92 includes a plurality of elongated bus electrodes (921) and a plurality of finger electrodes 922 that are laterally connected to the bus electrodes 921. The plurality of finger electrodes 922 are mainly used for collecting current, and the plurality of bus electrodes 921 can be respectively soldered to a ribbon (Ribbon) not shown in the module package to collect the finger electrodes 922. The current is transmitted to the outside, so the width of the bus electrode 921 is usually wide.

The bus electrode 921 and the plurality of finger electrodes 922 are manufactured by applying a conductive paste to a light-receiving surface of the battery body 91 by screen printing, and curing the conductive paste by high-temperature sintering (Firing). . But as the price of conductive pastes (such as silver-containing slurries) continues to rise, Moreover, since the width of the bus electrode 921 is wide and the amount of the slurry is large, the production cost of the battery is high. In order to save material cost, there is currently a method of forming the plurality of bus electrodes 921 using a conductive paste having a lower conductivity and a lower cost, but this causes the finger electrodes 922 to be connected to the plurality of bus electrodes 921. The current collection effect is worse.

In addition, after the screen printing is performed multiple times, it is easy to have a slurry plugging problem, and the edges of the plurality of bus electrodes 921 formed by the screen printing are easily caused by uneven printing, which affects the conduction current effect and the welding. force. In order to avoid the above problem, the screen must be wiped to remove the slurry adhered thereto after a period of use, and the screen is repeatedly wiped to cause a decrease in production speed.

Accordingly, it is an object of the present invention to provide a solar cell, a module thereof, and a method of fabricating the same that is structurally innovative, can reduce production costs, and improve production efficiency, and can take into account current collection efficiency.

Thus, a method of fabricating a solar cell of the present invention comprises: preparing a substrate having a first surface and a second surface. Forming a first electrode and a second electrode and respectively on the first surface and the second surface. The step of forming the first electrode includes: forming a first conductive layer on the first surface by screen printing, the first conductive layer having a plurality of fingers extending along a first direction, and a a first solid line pattern portion extending in a second direction different from the first direction, and a first dotted line pattern portion extending along the second direction; forming a second conductive layer on the first conductive layer by screen printing a layer and the first surface, the second conductive layer The material is different from the first conductive layer, and the second conductive layer has a bus portion extending in the second direction, the bus portion overlapping the first dotted pattern portion and contacting the first solid line pattern portion.

The solar cell of the present invention comprises: a substrate having a first surface and a second surface, and a first electrode and a second electrode on the first surface and the second surface, respectively. The first electrode includes a first conductive layer and a second conductive layer. The first conductive layer has a plurality of fingers extending along a first direction, a first solid line pattern extending along a second direction different from the first direction, and a second extending along the second direction The first dotted line pattern portion. The second conductive layer is located on the first conductive layer and is different from the first conductive layer. The second conductive layer has a confluent portion extending in the second direction, and the confluent portion is overlapped with the first dashed pattern portion. And contacting the first solid line pattern portion.

The solar cell module of the present invention comprises: a first plate and a second plate disposed oppositely, a plurality of solar cells as described above and arranged between the first plate and the second plate, and a package. The encapsulant is located between the first plate and the second plate and is wrapped around the plurality of solar cells.

The effect of the present invention: the first conductive layer formed by screen printing has a first solid line pattern portion and a first dotted line pattern portion, so that the confluent portion of the second conductive layer formed by subsequent screen printing can overlap a dotted pattern portion and contacting the first solid line pattern portion. The material of the second conductive layer is different from the first conductive layer, so that the battery structure of the invention is innovative, current collecting efficiency is good, and the production cost and the production efficiency can be reduced.

11‧‧‧ first plate

12‧‧‧Second plate

13‧‧‧Package

14‧‧‧welding wire

2‧‧‧Solar battery

21‧‧‧Substrate

211‧‧‧ first surface

212‧‧‧ second surface

213‧‧ ‧ emitter layer

214‧‧‧Anti-reflective layer

22‧‧‧First electrode

23‧‧‧second electrode

24‧‧‧First conductive layer

25‧‧‧Second conductive layer

251‧‧ ‧ Confluence Department

252‧‧‧ side

26‧‧‧ finger

27‧‧‧Electrode pattern group

271‧‧‧The first solid line pattern department

272‧‧‧Second solid line pattern department

273‧‧‧First dotted line pattern

274‧‧‧second dotted line

275‧‧‧First pattern unit

276‧‧‧second pattern unit

277‧‧‧ Short side

278‧‧‧ Short side

31‧‧‧First direction

32‧‧‧second direction

41, 42, 43, 431, 432‧ ‧ steps

50‧‧‧First Screen

5‧‧‧First barrier

51‧‧‧ finger openings

52‧‧‧Open pattern unit

521‧‧‧First solid line opening

522‧‧‧Second solid opening

523‧‧‧First opening group

524‧‧‧Second opening group

525‧‧‧ first child opening

526‧‧‧Second sub-opening

60‧‧‧ Second Screen

6‧‧‧second barrier

61‧‧‧ confluence opening

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a top view of a known solar cell; FIG. 2 is a first comparison of the solar cell module of the present invention. Figure 3 is a top plan view of a solar cell of the first preferred embodiment; Figure 4 is a partial enlarged view of Figure 3, and Figure 4 shows a confluence with an imaginary line to clear A first conductive layer is disposed under the confluence portion, wherein the confluent portion is indicated by a hatched area, the first conductive layer is indicated by a dotted region; FIG. 5 is a cross-sectional view taken along line AA of FIG. 3; The flow chart of the first preferred embodiment of the method for manufacturing a solar cell of the present invention; FIG. 7 is a schematic view of the steps of the first preferred embodiment of the manufacturing method; FIG. 8 is a first screen version Schematic diagram of a first barrier layer for screen printing to form a first conductive layer of the solar cell of the present invention; FIG. 9 is a schematic diagram of a second barrier layer of a second screen, the second screen Used for screen printing to form the sun of the present invention a second conductive layer of the battery; FIG. 10 is a partial top plan view of a solar cell according to a second preferred embodiment of the solar cell module of the present invention, and FIG. 10 shows a confluence portion on an imaginary line to clearly show the confluence a first conductive layer under the portion; and FIG. 11 is a third preferred embodiment of the solar cell module of the present invention A partial top view of a solar cell, and FIG. 11 shows a confluence with an imaginary line to clearly show a first conductive layer below the confluence.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 2, a first preferred embodiment of the solar cell module of the present invention comprises: a first plate 11 and a second plate 12 disposed opposite each other, and a plurality of arrays arranged on the first plate 11 and the first a solar cell 2 of two sheets 12, at least one package 13 between the first plate 11 and the second plate 12 and wrapped around the plurality of solar cells 2, and a plurality of strips for serially connecting the plurality of A ribbon 14 of the solar cell 2.

The first plate 11 and the second plate 12 are not particularly limited in implementation, and a glass or plastic plate may be used, and the plate on one side of the light receiving surface of the battery must be permeable; if it is a double-sided light receiving battery, Both the first sheet 11 and the second sheet 12 must be permeable to light. The material of the package material 13 is, for example, a light transmissive ethylene vinyl acetate copolymer (EVA), or other related materials that can be used for solar cell module packaging.

The structures of the plurality of solar cells 2 are the same, and only one of them will be described below as an example. However, it is necessary that several batteries in the same module are not identical in structure.

Referring to FIGS. 3, 4, and 5, the solar cell 2 includes a substrate 21, a first electrode 22, and a second electrode 23.

The substrate 21 has a first surface 211 and a second Surface 212. The first surface 211 of the embodiment is a light receiving surface, and the second surface 212 is a back surface. When applied to a double-sided light-emitting battery, the second surface 212 can also receive light. In this embodiment, an emitter layer 213 is disposed on the inner side of the first surface 211. An anti-reflection layer 214 may also be selectively disposed on the first surface 211 of the emitter layer 213. The substrate 21 is, for example, a semiconductor germanium substrate, and one of the substrate 21 and the emitter layer 213 is an n-type semiconductor, and the other is a p-type semiconductor, thereby forming a pn junction, so that the substrate 21 can absorb light energy. Converted to electrical energy. The material of the anti-reflective layer 214, such as tantalum nitride, can be used to reduce light reflection to increase the amount of light incident.

The first electrode 22 is located on the first surface 211 of the substrate 21 and includes a first conductive layer 24 and a second conductive layer 25. The first conductive layer 24 has a plurality of fingers 26 extending along a first direction 31 and a plurality of electrode pattern groups 27 spaced along the first direction 31.

Each of the electrode pattern groups 27 has a first solid line pattern portion 271 and a second solid line pattern portion 272 arranged at intervals along the first direction 31, and the first solid line pattern portion 271 and the second solid line pattern. A first dotted line pattern portion 273 and a second broken line pattern portion 274 between the portions 272. The first solid line pattern portion 271 and the second solid line pattern portion 272 are both long linear and extend in a second direction 32 different from the first direction 31. In the present embodiment, the first direction 31 is perpendicular to the second direction 32. The first dotted line pattern portion 273 and the second dotted line pattern portion 274 are spaced apart along the first direction 31, and both extend in the second direction 32 in a long dotted line shape.

Wherein, the first dotted line pattern portion 273 has a plurality of A solid pattern portion 271 is spaced apart and spaced apart in the second direction 32 by the first pattern unit 275. The second dotted line pattern portion 274 is identical in design to the first broken line pattern portion 273 and has a plurality of second pattern units 276 spaced apart from the second solid line pattern portion 272 and spaced apart along the second direction 32. Each of the first pattern units 275 and each of the second pattern units 276 of the embodiment is substantially rectangular; however, the shape thereof is not limited in implementation.

The plurality of fingers 26 are arranged in parallel with each other along the second direction 32. Each of the fingers 26 connects the plurality of electrode pattern groups 27 and also connects the second conductive layer 25.

The second conductive layer 25 is located on the first conductive layer 24 and is different in material from the first conductive layer 24. The second conductive layer 25 is spaced apart from the first surface 211 by the anti-reflective layer 214. The second conductive layer 25 has a plurality of confluences 251 arranged along the first direction 31 and extending along the second direction 32. Each of the confluences 251 has two spaces extending along the second direction 32. Side 252. Each of the fingers 26 of the embodiment is connected to the plurality of confluences 251.

The plurality of busbars 251 are each elongated and are provided corresponding to the plurality of electrode pattern groups 27, respectively. The width of the plurality of bus bars 251 is larger than the width of the plurality of finger portions 26 and larger than the width of the first solid line pattern portion 271 and the second solid line pattern portion 272. In the present embodiment, each of the bus bars 251 is overlapped with the first dotted line pattern portion 273 and the second broken line pattern portion 274 of the electrode pattern group 27 corresponding thereto, and is in contact with the first solid line pattern portion 271 and the first Two solid line pattern portions 272. The bus bar 251 is in contact with the first solid line pattern portion 271, and may be referred to as a bus bar portion 251 and a first solid line pattern portion. 271 is overlapped, or the bus bar 251 is in contact with the first solid line pattern portion 271 only by its side 252. The overlap may mean that the bus bar 251 completely covers or only partially covers the first solid line pattern portion 271. The manner in which the bus bar portion 251 contacts the second solid line pattern portion 272 may be overlapped or side-contacted as in the above various modes.

The second electrode 23 is located on the second surface 212 of the substrate 21 for cooperating with the first electrode 22 to output electrical energy of the battery to the outside.

Referring to Figures 4, 6, and 7, a first preferred embodiment of the method for fabricating a solar cell of the present invention comprises: Step 41: preparing the substrate 21, the substrate 21 having the first surface 211 and the second surface opposite thereto 212. The emitter layer 213 is formed on the first surface 211 by a diffusion process or other doping method to form the substrate 21 to form a semiconductor p-n junction.

Step 42: Form the anti-reflective layer 214 on the first surface 211 by, for example, vacuum coating. The vacuum coating method may include physical vapor deposition (PVD), chemical vapor deposition (CVD), and the like.

Step 43: The first electrode 22 and the second electrode 23 are formed on the first surface 211 and the second surface 212, respectively. Referring to FIGS. 6, 7, 8, and 9, the step of forming the first electrode 22 includes: (1) Step 431: first forming the first conductive layer 24 on the first surface 211 by screen printing. This step is mainly The conductive paste for forming the first conductive layer 24 is coated on the first surface 211, and the first conductive layer 24 is located on the surface of the anti-reflective layer 214 (as shown in FIG. The third process of 7) is followed by baking to preliminarily dry the first conductive layer 24. (2) Step 432: The second conductive layer 25 is formed on the first conductive layer 24 and the first surface 211 by screen printing. This step is mainly performed with a second screen 60, which will be used to form the second layer. A conductive paste of the conductive layer 25 is coated on the first surface 211 and located on the first conductive layer 24 (as in the fourth flow of FIG. 7). The second electrode 23 can then be formed on the second surface 212 by screen printing (as in the fifth flow of FIG. 7). Finally, the first conductive layer 24, the second conductive layer 25 and the second electrode 23 are formed by high-temperature sintering (Firing) to dry and solidify the conductive paste, and the first conductive layer 24 can be burned through during sintering. The anti-reflective layer 214, after sintering, passes through the anti-reflective layer 214 to contact the emitter layer 213.

It should be noted that the screen printing sequence of the first electrode 22 and the second electrode 23 of the present invention need not be limited, because the second electrode 23 can be screen printed first, then the first electrode 22 is screen printed, and finally sintered together. . Further, the second electrode 23 actually includes at least one elongated bus bar, which is not shown in the drawings.

Next, the configuration of the first halftone 50 and the second halftone 60 will be specifically described. Referring to Figures 4, 7, and 8, the first screen 50 includes a first web, not shown, and a first barrier layer 5 bonded to the first web. The first barrier layer 5 includes a plurality of finger openings 51 extending along the first direction 31, and a plurality of opening pattern units 52 spaced along the first direction 31. Each of the opening pattern units 52 includes along the first a first solid line opening 521 and a second solid line opening 522 extending in the direction 31 and extending along the second direction 32, and a first between the first solid line opening 521 and the second solid line opening 522 a first opening group 523 and a second opening group 524, The first opening group 523 and the second opening group 524 are respectively adjacent to but not contacting the first solid line opening 521 and the second solid line opening 522. The first opening group 523 has a plurality of first sub-openings 525 spaced along the second direction 32. The second opening group 524 has a plurality of second sub-openings 526 spaced along the second direction 32.

The opening pattern of the first barrier layer 5 corresponds to the pattern of the first conductive layer 24 to be formed. Therefore, when the first screen 50 is used for screen printing, the first solid line opening 521 and the second solid line opening are opened. The conductive paste of 522, that is, the plurality of first solid line pattern portions 271 and the second solid line pattern portion 272 are formed on the first surface 211 of the substrate 21; through the first opening group 523 and the second opening group The conductive paste of 524 is correspondingly formed with the first dotted line pattern portion 273 and the second broken line pattern portion 274, respectively, and the first broken line pattern portion 273 of the embodiment is spaced apart from the first solid line pattern portion 271 without being connected. The second dotted line pattern portion 274 is spaced apart from the second solid line pattern portion 272 and is not connected; the plurality of finger portions 26 are correspondingly formed by the conductive paste of the plurality of finger openings 51.

Referring to Figures 4, 7, and 9, the second screen 60 includes a second web, not shown, and a second barrier layer 6 bonded to the second web. The second barrier layer 6 includes a plurality of confluence openings 61 extending linearly in the second direction 32. The opening pattern of the second barrier layer 6 corresponds to the pattern of the second conductive layer 25 to be formed. Therefore, when the second screen 60 is used for screen printing, the conductive paste passing through the plurality of bus openings 61 is correspondingly The plurality of confluent portions 251 of the second conductive layer 25 are formed on the first conductive layer 24, and the plurality of confluent portions 251 are overlapped with the first dotted pattern portion 273. And the second dotted line pattern portion 274 is in contact with the first solid line pattern portion 271 and the second solid line pattern portion 272.

Moreover, most of each of the confluent portions 251 formed by the screen printing can be located between the first solid line pattern portion 271 and the second solid line pattern portion 272 corresponding thereto by an appropriate screen opening pattern design. This definition mainly means that the confluence portion 251 is substantially maintained between the two solid line pattern portions 271 and 272 or overlapped thereon, but it is not excluded that the confluence portion 251 may be partially located outside the two solid line pattern portions 271 and 272 ( And the portion does not overlap with the solid line pattern portions 271 and 272. At this time, the total area of the portion of the bus bar portion 251 located outside the two solid line pattern portions 271 and 272 is smaller than the two solid line pattern portions 271 and 272. The sum of the areas.

Referring to FIGS. 7, 8, and 9, in addition, the first conductive layer 24 can be connected to the anti-reflective layer 214 by a suitable high-temperature sintering process by selecting an appropriate conductive paste. The first surface 211 may be subjected to an opening process prior to the portion of the anti-reflective layer 214 where the first conductive layer 24 is formed. The conductive paste of the first conductive layer 24 is not limited to being burnable. The first conductive layer 24 is passed through the anti-reflective layer 214 to connect the first surface 211 by the slurry of the anti-reflective layer 214. The anti-reflective layer 214 separates the first surface 211 from the second conductive layer 25.

In the implementation of the present invention, each of the electrode pattern groups 27 may also omit the second solid line pattern portion 272 and the second dotted line pattern portion 274. However, the number of the confluent portions 251 of the solar cell 2 of the present embodiment is three, but it may be one or other quantities when implemented. The first block of the first screen 50 The opening pattern of the second barrier layer 6 of the layer 5 and the second screen 60 is designed according to the electrode pattern to be formed.

Referring to Figures 4, 5, and 8, the first conductive layer 24 and the second conductive layer 25 of the first electrode 22 of the present invention are divided into two screen printings, so that different materials can be used for screen printing. Because the finger portion 26 of the first conductive layer 24 is used for collecting current, a slurry having a better conductivity can be used, and the bus portion 251 of the second conductive layer 25 can use a slurry having a lower conductivity. To reduce material costs. Of course, the materials of the first conductive layer 24 and the second conductive layer 25 are selected, and there may be several different matching manners due to other considerations. The plurality of first solid line pattern portions 271 and the second solid line pattern portion 272 are respectively disposed on both sides of the plurality of confluence portions 251 to help collect currents, thereby improving the connection portions of the confluent portions 251 and the fingers 26 The current collecting effect is achieved, and the bus bar portion 251 contacts the first solid line pattern portion 271 and the second solid line pattern portion 272 so that the surface thereof is substantially integrally formed. In addition, by designing the first opening group 523 and the second opening group 524 of the first screen 50, the conductive paste can be passed to form the first dotted line pattern portion 273 and the second broken line pattern portion 274, thus enabling subsequent The formed confluence portion 251 may overlap the first dotted line pattern portion 273 and the second broken line pattern portion 274, and in particular, the two long sides of the confluence portion 251 may overlap with the first dotted line pattern portion 273 and the second broken line pattern portion 274 Therefore, it is possible to avoid the problem that the bus electrodes printed on the screen have side holes in the past due to the screen sewn. Therefore, according to the present invention, the integration of the first flow line portion 251, the first broken line pattern portion 273, and the second broken line pattern portion 274 can avoid the problem of holes in the bus portion 251. When the method of the present invention is performed, the wiping screen can be reduced. The number of times, which can increase production efficiency.

In summary, the first conductive layer 24 is formed by screen printing, and the first conductive layer 24 has a first solid line pattern portion 271 and a first broken line pattern portion 273, so that the first The confluent portion 251 of the two conductive layers 25 may overlap the first dotted line pattern portion 273 and contact the first solid line pattern portion 271, and the material of the second conductive layer 25 is different from the first conductive layer 24, so that the present invention The battery structure is innovative, the current collection efficiency is good, and the production cost can be reduced and the production efficiency can be improved.

Referring to FIG. 10, a second preferred embodiment of the solar cell module of the present invention is substantially the same as the first preferred embodiment except for the structure of the first dotted line pattern portion 273 and the second broken line pattern portion 274. Each of the first dotted line patterns 273 of the embodiment has a plurality of first pattern units 275 connected to the first solid line pattern portion 271 , and the plurality of first pattern units 275 are all extending along the first direction 31 . Each of the first pattern units 275 is connected to the first solid line pattern portion 271 by a short side 277 of the rectangle (the short side 277 of one of the first pattern units 275 is indicated by a broken line in the figure). Similarly, each second dotted line pattern portion 274 of the embodiment has a plurality of second pattern units 276 connected to the second solid line pattern portion 272, and the plurality of second pattern units 276 are along the first direction. 31 extending rectangles, each of the second pattern units 276 connecting the second solid line pattern portion 272 with a short side 277 of the rectangle (the short side 277 of one of the second pattern units 276 is indicated by a broken line in the figure). .

The manufacturing method of this embodiment is the same as that of the first preferred embodiment except that the first screen of different opening patterns must be used to form the pattern of the first conductive layer 24 of the present embodiment by screen printing.

It should be noted that, when implemented, the first pattern unit 275 may also be spaced apart from the first solid line pattern portion 271; the second pattern unit 276 may also be spaced apart from the second solid line pattern portion 272.

This embodiment can also achieve the same effects as the first preferred embodiment, and will not be described here.

Referring to FIG. 11, a third preferred embodiment of the solar cell module of the present invention is substantially the same as the second preferred embodiment. The difference is that each first pattern unit 275 of the embodiment is a triangle. Each of the first pattern units 275 connects the first solid line pattern portion 271 with one side of the triangle. Similarly, each of the second pattern units 276 of the present embodiment is a triangle, and each of the second pattern units 276 connects the second solid line pattern portion 272 with one side of the triangle.

The manufacturing method of this embodiment is the same as the first preferred embodiment except that the first screen of different opening patterns must be used. In addition, in the implementation, the first pattern unit 275 of the embodiment may be spaced apart from the first solid line pattern portion 271; the second pattern unit 276 may also be spaced apart from the second solid line pattern portion 272.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

2‧‧‧Solar battery

21‧‧‧Substrate

211‧‧‧ first surface

214‧‧‧Anti-reflective layer

22‧‧‧First electrode

24‧‧‧First conductive layer

25‧‧‧Second conductive layer

251‧‧ ‧ Confluence Department

252‧‧‧ side

26‧‧‧ finger

27‧‧‧Electrode pattern group

271‧‧‧The first solid line pattern department

272‧‧‧Second solid line pattern department

273‧‧‧First dotted line pattern

274‧‧‧second dotted line

275‧‧‧First pattern unit

276‧‧‧second pattern unit

31‧‧‧First direction

32‧‧‧second direction

Claims (12)

A method of manufacturing a solar cell, comprising: preparing a substrate having a first surface and a second surface; and forming a first electrode and a second electrode on the first surface and the first The step of forming the first electrode includes: forming a first conductive layer on the first surface by screen printing, the first conductive layer having a plurality of fingers extending along a first direction a first solid line pattern portion extending along a second direction different from the first direction, and a first dotted line pattern portion extending along the second direction; and forming a second conductive layer by screen printing On the first conductive layer and the first surface, the material of the second conductive layer is different from the first conductive layer, and the second conductive layer has a confluence extending in the second direction, and the confluence overlaps The first dotted line pattern portion is in contact with the first solid line pattern portion. The method of manufacturing a solar cell according to claim 1, further comprising forming an anti-reflection layer on the first surface, the first conductive layer passing through the anti-reflection layer to connect the first surface. The method of manufacturing a solar cell according to claim 2, wherein the anti-reflection layer separates the first surface from the second conductive layer. The method of manufacturing a solar cell according to claim 1, wherein the first dotted line pattern portion has a plurality of spaces spaced apart from the first solid line pattern portion A pattern unit. The method of manufacturing a solar cell according to claim 1, wherein the first dotted line pattern portion has a plurality of first pattern units connected to the first solid line pattern portion. The method of manufacturing a solar cell according to claim 4, wherein each of the first pattern units is a triangle. The method of manufacturing a solar cell according to claim 1, wherein the first dotted line pattern portion has a plurality of first pattern units that are triangular, each of the first pattern units being connected to the first one of the triangles Solid line pattern section. The method of manufacturing a solar cell according to claim 1, wherein the first dotted pattern portion has a plurality of first pattern units that are rectangular, and each of the first pattern units is connected to the short side of the rectangle. A solid line pattern section. The method of manufacturing a solar cell according to claim 1, wherein the first conductive layer further has a second solid line pattern portion extending in the second direction and spaced apart from the first solid line pattern portion, and an edge a second dotted line pattern portion extending in the second direction, the bus portion overlapping the second broken line pattern portion and contacting the second solid line pattern portion. The method of manufacturing a solar cell according to claim 9, wherein a majority of the bus bar is located between the first solid line pattern portion and the second solid line pattern portion. A solar cell comprising: a substrate having a first surface and a second surface; and a first electrode and a second electrode are respectively disposed on the first surface and the second surface; wherein the first electrode comprises: a first conductive layer having a plurality of fingers extending along a first direction a first solid line pattern portion extending along a second direction different from the first direction, and a first dotted line pattern portion extending along the second direction; and a second conductive layer located at the first The conductive layer is different from the first conductive layer, and the second conductive layer has a confluence extending in the second direction, the confluence is overlapped with the first dashed pattern portion and contacts the first solid pattern portion . A solar cell module comprising: a first plate and a second plate disposed oppositely; a plurality of solar cells according to claim 11 arranged between the first plate and the second plate; and a package The material is located between the first plate and the second plate and is wrapped around the plurality of solar cells.