TWM502574U - Printing screen and solar cell fabricated by the same - Google Patents

Abstract

The present disclosure provides a printing screen for fabricating an electrode of a solar cell. The printing screen includes a mesh layer and a printing pattern layer. The printing pattern layer is sandwiched between the mesh layer and a semiconductor substrate. The printing pattern layer has an electrode-material filling area, a blocking portion and at least one supporting point, wherein the blocking portion is adjacent with the electrode-material filling area, and the supporting point is positioned in the electrode-material filling area. The electrode-material filling area has a first side and a second side opposite to the first side. The first side has at least one first supporting convex portion, and the second side has at least one second supporting convex portion. A straight line, between the first side and the second side, has the first supporting convex portion, the second supporting convex portion, the supporting point or a combination thereof. A solar cell fabricated by the printing screen is also provided herein.

Description

Printing screen and solar cells made using the same

This creation is directed to a printing screen, and more particularly to a printing screen for making solar cell electrodes.

Screen printing has been the most commonly used technique for making solar cell electrodes. Generally, the conductive paste is placed on a printing screen, and the conductive paste is brushed into the mesh layer of the printing screen by a doctor blade to cause the conductive paste to fall on the surface of the semiconductor substrate to form a solar cell. The bus electrode.

However, when a doctor blade is used, pressure is required to enable the conductive paste to penetrate the mesh layer of the printing screen, so that the formed bus electrode generates a concave surface, so that the welding force of the terminal electrode of the subsequent module is lowered, which is easy to occur. Open circuit. In addition, since the bus electrode has a recessed surface, the contact area between the bus electrode and the module end electrode is reduced, thereby causing poor electrical contact between the bus electrode and the module end electrode, and reducing the yield of the solar cell.

Therefore, there is a need for a novel printing screen and a solar cell fabricated using the same to solve the problem of sinking the surface of a bus electrode produced by a conventional printing screen and a solar cell produced using the same.

In view of the problems faced by the prior art, the present invention discloses a novel printing screen. The bus electrode of the solar cell fabricated by using the printing screen has a uniform thickness, which can improve the welding tension of the electrode structure and the module end electrode. And increasing the contact area between the bus electrode and the module end electrode to improve the electrical contact between the bus electrode and the module end electrode, thereby improving the yield of the solar cell.

One aspect of the present invention is to provide a printing screen for making solar cell electrodes. This printing screen comprises a mesh layer and a printed pattern layer.

The printed pattern layer is disposed between the mesh layer and the semiconductor substrate. The printed pattern layer has an electrode blanking region, a shielding portion and at least one supporting point, wherein the shielding portion is adjacent to the electrode blanking region, and the supporting point is located in the electrode blanking region.

The electrode blanking zone has a first side and a second side opposite the first side. The first side has at least one first supporting protrusion formed by the shielding portion, and the second side has at least one second supporting protrusion formed by the shielding portion. A first support bump, a second support bump, a support point, or a combination thereof is disposed on any of the straight lines between the first side edge and the second side edge.

According to an embodiment of the present invention, the electrode blanking region includes a plurality of bus electrode blanking regions, a plurality of finger electrode blanking regions, or a combination thereof.

According to an embodiment of the present invention, the confluent electrode blanking regions have a plurality of first segments and a plurality of second segments, and the first segments and the second segments are alternately arranged and connected to each other.

According to an embodiment of the present invention, the first sections of the confluent electrode blanking zone have a first confluent electrode blanking zone width. According to an embodiment of the present invention, the first bus electrode blanking area has a width of 0.5 to 2.5 mm.

According to an embodiment of the present invention, the second sections of the confluent electrode blanking zone have a second bus electrode blanking zone width. According to an embodiment of the present invention, the second bus electrode blanking area has a width of between 0.05 and 2 mm.

According to an embodiment of the present invention, at least one of the confluent electrode blanking areas of the printed pattern layer has a first blanking area and a second blanking area, and the first blanking area is not connected to the second blanking area. .

According to an embodiment of the present invention, the confluent electrode blanking regions extend in the first direction, the finger electrode blanking regions extend in the second direction, and one end of the finger electrode blanking regions and the confluent electrodes fall. The material areas are connected.

According to an embodiment of the present invention, the width of the blanking regions of the finger electrodes is 0.02 to 0.2 μm.

According to an embodiment of the present invention, the first support bump, the second support bump, and the support point have a geometric figure.

According to an embodiment of the present invention, the geometric shape comprises a triangle, a quadrangle, a pentagon, a hexagon, a circle, a strip, or a combination thereof.

According to an embodiment of the present invention, the support points have a diameter of 0.05 to 2.4 mm.

According to an embodiment of the present invention, the distance between each of the two adjacent support points, the support points and the first support protrusions, the support points and the second support protrusions or a combination thereof is 0.05 to 2.4 mm.

Another aspect of the present invention is to provide a solar cell. This solar cell includes a semiconductor substrate, an upper electrode structure, and a lower electrode structure.

The semiconductor substrate has an upper surface and a lower surface opposite to the upper surface. The upper electrode structure is located on the upper surface of the semiconductor substrate and is formed using the above-described printing screen. The upper electrode structure has a first side and a second side opposite to the first side, wherein the first side has at least one first recess and the second side has at least one second recess, and the upper electrode structure has At least one first recessed hole. There is a first recess, a second recess, a first recess, or a combination thereof on any of the straight lines between the first side and the second side.

The lower electrode structure is located on the lower surface of the semiconductor substrate and is formed using the above-described printing screen. The lower electrode structure has a third side and a fourth side opposite to the third side, wherein the third side has at least one third recess, and the fourth side has at least one fourth recess, and the lower electrode structure has At least one second recessed hole. There is a third recess, a fourth recess, a second recess, or a combination thereof on any of the straight lines between the third side and the fourth side.

According to an embodiment of the present invention, the upper electrode structure includes a plurality of upper bus electrodes, a plurality of upper finger electrodes, or a combination thereof, and the lower electrode structure includes a plurality of lower bus electrodes, a plurality of lower finger electrodes, or a combination thereof.

According to an embodiment of the present invention, the upper bus electrodes and the lower bus electrodes extend in a first direction, the upper finger electrodes and the lower finger electrodes extend in a second direction, and the upper finger electrodes and the One end of the lower finger electrode is connected to each of the upper bus electrodes or the lower bus electrodes, wherein the second direction is different from the first direction.

According to an embodiment of the present invention, the upper bus electrodes, the lower bus electrodes or a combination thereof have a plurality of first segments and a plurality of second segments, and the first segments and the second segments are alternated with each other. Arrange and connect.

According to an embodiment of the present invention, the first segments have a first upper bus electrode width. According to an embodiment of the present invention, the first upper bus electrode has a width of 0.5 to 2.5 mm.

According to an embodiment of the present invention, the second sections have a second upper bus electrode width. According to an embodiment of the present invention, the second upper bus electrode has a width of between 0.05 and 2 mm.

According to an embodiment of the present invention, at least one of the upper bus electrodes, the lower bus electrodes, or a combination thereof has a first bus bar segment and a second bus bar segment, and the first bus bar segment is not connected to the second bus bar segment.

According to an embodiment of the present invention, the first recess, the second recess, the third recess, the fourth recess, the first recess, and the second recess each have a geometric shape.

According to an embodiment of the present invention, the geometric shape comprises a triangle, a quadrangle, a pentagon, a hexagon, a circle, a strip, or a combination thereof.

According to an embodiment of the present invention, the apertures of the first recessed hole and the second recessed hole are each independently 0.05 to 2.4 mm.

According to an embodiment of the present invention, the distance between each of the two adjacent first recessed holes, the first recessed holes and the first recessed portion, the first recessed hole and the second recessed portion or a combination thereof is 0.05 to 2.4 mm.

According to an embodiment of the present invention, the distance between each of the two adjacent second recessed holes, the second recessed holes and the third recessed portion, the second recessed hole and the fourth recessed portion or a combination thereof is 0.05 to 2.4 mm.

According to an embodiment of the present invention, the upper finger electrodes, the lower finger electrodes, or a combination thereof have a width of 0.02 to 0.2 μm.

100, 200, 400, 600, 800‧‧‧ Printed version

110, 210, 410, 610, 810‧‧‧ mesh layers

120, 220, 420, 620, 820 ‧ ‧ printed pattern layer

122‧‧‧Concurrent electrode blanking area

124, 224, 424, 624, 824‧‧ ‧ occlusion

130, 230, 310, 510, 710, 910‧‧‧ semiconductor substrates

140a, 140b, 240a, 240b‧‧‧ conductive paste

150, 250‧‧‧ scraper

160a, 160b, 260a, 260b‧‧‧ bus electrodes

201, 301, 401, 501, 601, 701, 801, 901‧‧‧ first direction

202, 302, 402, 502, 602, 702, 802, 902‧‧‧ second direction

221, 321, 521, 721, 921‧‧‧ first side

222, 422, 622, 822‧‧‧ electrode blanking area

223, 323, 523, 723, 923‧‧‧ second side

225‧‧‧First support bump

226, 426, 626, 826 ‧ ‧ support points

227‧‧‧Second support bump

300a, 300b, 500a, 500b, 700, 900‧‧‧ solar cells

303, 503, 703, 903‧‧‧ upper electrode structure

312, 512, 712, 912‧‧‧ upper surface

314, 514‧‧‧ lower surface

320, 520, 720, 920‧‧‧ upper bus electrodes

324, 524, 724, 924‧‧‧ first recess

325, 525, 725, 925‧‧‧ first recess

327, 526, 727, 927‧‧‧ second recess

330, 530‧‧‧ lower electrode structure

331, 531‧‧‧ third side

343, 533‧‧‧ fourth side

334, 534‧‧‧ second recess

335, 535‧‧‧ third recess

337, 537 ‧ ‧ fourth recess

340, 540, 740, 940‧‧‧ upper finger electrodes

432, 542, 632, 742, 832, 942‧‧‧ first section

434, 544, 634, 744, 834, 944‧‧‧ second section

642, 842‧‧‧ first blanking area

644, 844‧‧‧Second blanking area

752, 952‧‧‧ first confluence section

754, 954‧‧‧second confluence section

A, C‧‧‧ area

B-B’, D-D’‧‧‧ hatching

H‧‧‧ Depth of depression

r ₁ ‧‧‧diameter

d ₁ ‧‧‧distance

W1, W2‧‧‧ width

1 is a top view of a conventional printing screen 100; FIG. 2 is a partial enlarged view of the printing screen 100 shown in FIG. 1; and FIGS. 3 to 4 are drawn by the first drawing. FIG. 5 is a cross-sectional view showing a bus electrode of a solar cell formed by using the printing screen 100 shown in FIG. 1; FIG. 6 is a cross-sectional view of the bus electrode of the solar cell formed by the printing screen 100 shown in FIG. A top view of a printing screen 200 shown in one embodiment of the creation; a seventh partial view of the printing screen 200 shown in FIG. 6; and an eighth drawing in FIG. FIG. 10 is a schematic cross-sectional view showing a bus electrode of a solar cell formed by using the printing screen 200 illustrated in FIG. 6; 11 is a top view of a solar cell 300a according to an embodiment of the present invention; FIG. 12 is a bottom view of the solar cell 300b according to an embodiment of the present creation; and FIG. 13 is one of the creations according to the present invention. FIG. 14 is a top view of a solar cell 500a according to an embodiment of the present invention; and FIG. 15 is a solar cell according to an embodiment of the present invention. 5 is a top view of a printing screen 600 according to an embodiment of the present invention; and FIG. 17 is a top view of a solar cell 700 according to an embodiment of the present invention; The figure is a top view of a printing screen 800 according to an embodiment of the present invention; and a 19th drawing is a top view of a solar cell 900 according to an embodiment of the present invention.

The present invention is described in detail by way of example and with reference to the accompanying drawings In the drawings, the shape or thickness of the embodiment may be expanded to simplify or facilitate the labeling. The parts of the elements in the drawings will be described in words. It will be appreciated that elements not shown or described may be in a variety of styles known to those skilled in the art.

The terminology used herein is for the purpose of describing particular embodiments and is not intended to The singular forms "a", "the", "the" and "the" It is to be understood that the term "comprises" and / or "comprising" when used in the specification is intended to mean the presence of the described features, integers, steps, operations, components and/or components, but does not exclude the presence or addition. One or more other features, integers, steps, operations, components, components, and/or groups thereof. Embodiments of the present disclosure are described herein with reference to cross-sectional illustrations of schematic illustrations of the idealized embodiments (and intermediate structures) of the present invention. As such, it is contemplated that the shapes of the descriptions may be varied, for example, from variations in manufacturing techniques and/or tolerances. Therefore, the embodiments of the present invention should not be construed as being limited to the specific shapes of the embodiments described herein, but will include, for example, a change in the shape of the manufacture, and the regions illustrated in the figures are illustrative in nature. It is not intended to describe the actual shape of the region of the device and is not intended to limit the scope of the present invention.

Figure 1 is a top view of a conventional printing screen 100. In Fig. 1, the printing screen 100 has a mesh layer 110 and a printed pattern layer 120. The printed pattern layer 120 is disposed on the mesh layer 110 and has a bus electrode blanking area 122 and a shielding portion 124. The shielding portion 124 is adjacent to the bus electrode blanking region 122.

Please refer to Figure 2 below. Fig. 2 is a partial enlarged view of a region A in Fig. 1. In FIG. 2, the printed pattern layer 120 is disposed on the mesh layer 110 and has a bus electrode blanking area 122 and a blocking portion 124. The shielding portion 124 is adjacent to The bus electrode blanking area 122. Next, the bus electrode for forming a solar cell using the printing screen 100 will be described along the section line B-B'. Please refer to Figs. 3 and 4.

3 to 4 are schematic views showing the stages of forming the bus electrode of the solar cell by using the printing screen 100 shown in Fig. 1. In FIG. 3, the printing screen 100 is placed on the semiconductor substrate 130, wherein the printing pattern layer 120 is located between the mesh layer 110 and the semiconductor substrate 130. Next, the conductive paste 140a is placed on the mesh layer 110, and the conductive paste 140a is penetrated by the mesh layer 110 by the doctor blade 150, and the conductive paste 140b falls on the bus electrode blanking area 122 of the printed pattern layer 120. In order to form the bus electrode 160a, as shown in FIG. It should be noted that the shielding portion 124 is used to support the downward pressure of the mesh layer 110 and the scraper 150. However, in the bus electrode blanking region 122 of the printed pattern layer 120, since there is no support, the mesh layer 110 is generated. Depression phenomenon. When the mesh layer 110 is recessed, the formed bus electrode 160b also produces a concave surface having the same contour and a significant recess depth (H) as shown in FIG.

The recessed surface of the conventional bus electrode will cause a decrease in the welding tension of the terminal electrode of the subsequent module, and is likely to cause an open circuit. In addition, since the bus electrode has a recessed surface, the contact area between the bus electrode and the module end electrode is reduced, thereby causing poor electrical contact between the bus electrode and the module end electrode, and reducing the yield of the solar cell.

In order to solve the surface dishing phenomenon caused by the electrodes of the above conventional solar cell, the embodiment of the present invention provides a printing screen having a support point. The bus electrode of the solar cell fabricated by using the printing screen provided by the embodiment of the present invention has a uniform thickness, can improve the welding tension of the electrode structure and the module end electrode, and increase the contact between the bus electrode and the module end electrode. surface The product is used to improve the electrical contact between the bus electrode and the module terminal electrode, thereby improving the yield of the solar cell.

Figure 6 is a top plan view of a printing screen 200, depicted in accordance with one embodiment of the present writing. In FIG. 6, the printing screen 200 includes a mesh layer 210 and a printed pattern layer 220.

The printed pattern layer 220 is disposed on the mesh layer 210. The printed pattern layer 220 has an electrode blanking region 222, a shielding portion 224 and at least one support point 226, wherein the shielding portion 224 is adjacent to the electrode blanking region 222, and the support point 226 is located in the electrode blanking region 222.

In FIG. 6, the electrode blanking area 222 has a plurality of bus electrode blanking areas and a plurality of finger electrode blanking areas, and one end of the finger electrode blanking area is connected to the bus electrode blanking area, wherein the bus electrode falls The frit extends in a first direction 201 and the finger electrode blanking region extends in a second direction 202. According to an embodiment of the present invention, the width of the blanking regions of the finger electrodes is 0.02 to 0.2 μm. According to an embodiment of the present invention, the first direction 201 and the second direction 202 are vertical. According to an embodiment of the present invention, the angle between the first direction 201 and the second direction 202 is greater than 0 degrees and less than 90 degrees.

Fig. 7 is a partially enlarged view of a region C in Fig. 6. In FIG. 7, the electrode blanking zone 222 has a first side 221 and a second side 223 opposite the first side 221 . The first side 221 has at least one first supporting protrusion 225 formed by the shielding portion 224 , and the second side 223 has at least one second supporting protrusion 227 formed by the shielding portion 224 . There is a first support bump 225, a second support bump 227, a support point 226, or a combination thereof on either line between the first side 221 and the second side 223. According to the implementation of this creation For example, the first support protrusion 225, the second support protrusion 227, the support point 226, or a combination thereof may be disposed on any of the straight lines extending along the first direction 201 between the first side 221 and the second side 223.

According to the embodiment of the present invention, the first supporting protrusion 225, the second supporting protrusion 227, and the supporting point 226 have a geometric figure. According to an embodiment of the present invention, the geometric shape comprises a triangle, a quadrangle, a pentagon, a hexagon, a circle, a strip, or a combination thereof.

According to an embodiment of the present invention, the diameters (r ₁ ) of the support points 226 are 0.05 to 2.4 mm. According to an embodiment of the present invention, the distance (d ₁ ) between each of the two adjacent support points 226, the support points 226 and the first support protrusions 225, the support points 226 and the second support protrusions 227 or a combination thereof is 0.05~2.4 mm.

Next, the bus electrode for forming a solar cell using the printing screen 200 will be described along the section line D-D'. Please refer to Figs. 8 to 9 are schematic views showing the stages of forming the bus electrode of the solar cell by using the printing screen 200 shown in FIG.

In FIG. 8, the printing screen 200 is placed on the semiconductor substrate 230, wherein the printing pattern layer 220 is located between the mesh layer 210 and the semiconductor substrate 230. Next, the conductive paste 240a is placed on the mesh layer 210, and the conductive paste 240a is penetrated by the mesh layer 210 by the doctor blade 250, and the conductive paste 240b falls on the bus electrode blanking area 222 of the printed pattern layer 220. In order to form the bus electrode 260a, as shown in FIG.

It should be noted that the shielding portion 224 and the supporting point 226 are used to support the downward pressure of the mesh layer 210 and the scraper 250, so that the mesh layer 210 does not have a concave shape. Trap phenomenon. Next, please refer to FIG. 10, which is a cross-sectional view of a bus electrode of a solar cell formed by using the printing screen 200 shown in FIG. When the mesh layer 210 does not generate a recess, the formed bus electrode 260b has a flat surface.

Figure 11 is a top plan view of a solar cell 300a according to an embodiment of the present invention. In Fig. 11, the solar cell 300a includes a semiconductor substrate 310, an upper electrode structure 303, and a lower electrode structure (not shown).

The semiconductor substrate 310 has an upper surface 312 and a lower surface (not shown) opposite to the upper surface 312. The upper electrode structure 303 is located on the upper surface 312 of the semiconductor substrate 310 and is formed using a printing screen 200 as shown in FIG. The upper electrode structure 303 has a first side 321 and a second side 323 opposite to the first side 321 , wherein the first side 321 has at least one first recess 325 and the second side 323 has at least a second side The recess 327 and the upper electrode structure 303 have at least one first recess 324. There is a first recess 325, a second recess 327, a first recess 324, or a combination thereof on either line between the first side 321 and the second side 323.

According to an embodiment of the present invention, the first recess 325, the second recess 327, and the first recess 324 each have a geometric figure. According to an embodiment of the present invention, the geometric shape comprises a triangle, a quadrangle, a pentagon, a hexagon, a circle, a strip, or a combination thereof.

According to an embodiment of the present invention, the apertures of the first recessed holes 324 are each 0.05 to 2.4 mm. According to the embodiment of the present invention, the distance between each of the two adjacent first recessed holes 324, the first recessed holes 324 and the first recessed portion 325, the first recessed hole 324 and the second recessed portion 327 or a combination thereof is 0.05~ 2.4 mm.

According to an embodiment of the present invention, the upper electrode structure 303 includes a plurality of upper bus electrodes 320, a plurality of upper finger electrodes 340, or a combination thereof. According to an embodiment of the present invention, the upper bus electrodes 320 extend in the first direction 301, the upper finger electrodes 340 extend in the second direction 302, and one ends of the upper finger electrodes 340 are connected to the upper bus electrodes 320. Where the second direction 302 is different from the first direction 301. According to an embodiment of the present invention, the upper finger electrodes 340 have a width of 0.02 to 0.2 μm.

According to an embodiment of the present invention, the lower electrode structure (not shown) of the solar cell 300a is the same as the upper electrode structure 303.

Fig. 12 is a bottom view of the solar cell 300b according to an embodiment of the present creation. In FIG. 12, the solar cell 300b includes a semiconductor substrate 310, an upper electrode structure (not shown), and a lower electrode structure 330. According to an embodiment of the present invention, the upper electrode structure (not shown) of the solar cell 300b is the same as the upper electrode structure 303 of the solar cell 300a.

The semiconductor substrate 310 has an upper surface (not shown) and a lower surface 314 opposite to the upper surface (not shown). The lower electrode structure 330 is located on the lower surface 314 of the semiconductor substrate 310. The lower electrode structure 330 has a third side 331 and a fourth side 333 opposite to the third side 331, wherein the third side 331 has at least one third recess 335, and the fourth side 343 has at least a fourth The recess 337 and the lower electrode structure 330 have at least one second recess 334. There is a third recess 335, a fourth recess 337, a second recess 334, or a combination thereof on any of the straight lines between the third side 331 and the fourth side 343.

According to an embodiment of the present invention, the third recess 335, the fourth recess 337, and the second recess 334 each have a geometric figure. According to the reality of this creation By way of example, the above geometry comprises a triangle, a quadrangle, a pentagon, a hexagon, a circle, a strip, or a combination thereof.

According to an embodiment of the present invention, the apertures of the second recessed holes 334 are each 0.05 to 2.4 mm. According to the embodiment of the present invention, the distance between each of the two adjacent second concave holes 334, the second concave holes 334 and the third concave portion 335, the second concave hole 334 and the fourth concave portion 337 or a combination thereof is 0.05~ 2.4 mm.

According to an embodiment of the present invention, the lower electrode structure 330 includes a plurality of lower bus electrodes. According to an embodiment of the present invention, the lower bus electrodes extend in a first direction 301.

Figure 13 is a top plan view of a printing screen 400, depicted in accordance with one embodiment of the present writing. In Fig. 13, the printing screen 400 includes a mesh layer 410 and a printed pattern layer 420.

The printed pattern layer 420 is disposed on the mesh layer 410. The printed pattern layer 420 has an electrode blanking region 422, a shielding portion 424, and at least one support point 426, wherein the shielding portion 424 is adjacent to the electrode blanking region 422, and the support point 426 is located in the electrode blanking region 422.

In FIG. 13, the electrode blanking area 422 has a plurality of bus electrode blanking areas and a plurality of finger electrode blanking areas, and one end of the finger electrode blanking area is connected to the bus electrode blanking area, wherein the bus electrode falls The frit extends in a first direction 401 and the finger electrode blanking region extends in a second direction 402. According to an embodiment of the present invention, the width of the blanking regions of the finger electrodes is 0.02 to 0.2 μm. According to an embodiment of the present invention, the first direction 401 and the second direction 402 are vertical. According to an embodiment of the present invention, the angle between the first direction 401 and the second direction 402 is greater than 0 degrees and less than 90 degrees.

The printing screen 400 shown in Fig. 13 is similar to the printing screen 200 shown in Fig. 6, except that the confluent electrode blanking areas 422 of the printing screen 400 shown in Fig. 13 have a plurality of The first section 432 and the plurality of second sections 434, and the first section 432 and the second sections 434 are alternately arranged and connected to each other. According to an embodiment of the present invention, the first sections 432 of the bus electrode blanking area 422 have a first bus electrode blanking area width (W1). According to an embodiment of the present invention, the first bus electrode blanking zone width (W1) is 0.5 to 2.5 mm. According to an embodiment of the present invention, the second sections 434 of the bus electrode blanking area 422 have a second bus electrode blanking zone width (W2). According to an embodiment of the present invention, the second bus electrode blanking area width (W2) is between 0.05 and 2 mm.

Figure 14 is a top plan view of a solar cell 500a according to an embodiment of the present invention. In Fig. 14, the solar cell 500a includes a semiconductor substrate 510, an upper electrode structure 503, and a lower electrode structure (not shown).

The semiconductor substrate 510 has an upper surface 512 and a lower surface (not shown) opposite to the upper surface 512. The upper electrode structure 503 is located on the upper surface 512 of the semiconductor substrate 510 and is formed using a printing screen 400 as shown in FIG. The upper electrode structure 503 has a first side 521 and a second side 523 opposite to the first side 521, wherein the first side 521 has at least one first recess 525, and the second side 523 has at least a second side The recess 526 and the upper electrode structure 503 have at least one first recess 524. There is a first recess 525, a second recess 526, a first recess 524, or a combination thereof on either line between the first side 521 and the second side 523.

According to an embodiment of the present invention, the first recess 525, the second recess 526, and the first recess 524 each have a geometric figure. According to an embodiment of the present invention, the geometric shape comprises a triangle, a quadrangle, a pentagon, a hexagon, a circle, a strip, or a combination thereof.

According to an embodiment of the present invention, the apertures of the first recessed holes 524 are each 0.05 to 2.4 mm. According to an embodiment of the present invention, the distance between each of the two adjacent first recessed holes 524, the first recessed holes 524 and the first recessed portion 525, the first recessed hole 524 and the second recessed portion 526 or a combination thereof is 0.05~ 2.4 mm.

According to an embodiment of the present invention, the upper electrode structure 503 includes a plurality of upper bus electrodes 520, a plurality of upper finger electrodes 540, or a combination thereof. According to an embodiment of the present invention, the upper bus electrodes 520 extend in the first direction 501, the upper finger electrodes 540 extend in the second direction 502, and one ends of the upper finger electrodes 540 are connected to the upper bus electrodes 520. Wherein the second direction 502 is different from the first direction 501. According to an embodiment of the present invention, the upper finger electrodes 540 have a width of 0.02 to 0.2 μm.

The solar cell 500a shown in Fig. 14 is similar to the solar cell 300a shown in Fig. 11, except that the upper bus electrodes 520 of the solar cell 500a shown in Fig. 14 have a plurality of first segments 542. And a plurality of second segments 544, and the first segments 542 and the second segments 544 are alternately arranged and connected to each other. According to an embodiment of the present invention, the first segments 542 of the upper bus electrode 520 have a first bus electrode width (W1). According to an embodiment of the present invention, the first bus electrode width (W1) is 0.5 to 2.5 mm. According to an embodiment of the present invention, the second segments 544 of the upper bus electrode 520 There is a second bus electrode width (W2). According to an embodiment of the present invention, the second bus electrode width (W2) is between 0.05 and 2 mm.

According to an embodiment of the present invention, the lower electrode structure (not shown) of the solar cell 500a is the same as the upper electrode structure 503.

Fig. 15 is a bottom view of the solar cell 500b according to an embodiment of the present creation. In FIG. 15, the solar cell 500b includes a semiconductor substrate 510, an upper electrode structure (not shown), and a lower electrode structure 530. According to an embodiment of the present invention, the upper electrode structure (not shown) of the solar cell 500b is the same as the upper electrode structure 503 of the solar cell 500a.

The semiconductor substrate 510 has an upper surface (not shown) and a lower surface 514 opposite to the upper surface (not shown). The lower electrode structure 530 is located on the lower surface 514 of the semiconductor substrate 510. The lower electrode structure 530 has a third side 531 and a fourth side 533 opposite to the third side 531, wherein the third side 531 has at least one third recess 535, and the fourth side 533 has at least a fourth The recess 537 and the lower electrode structure 530 have at least one second recess 534. There is a third recess 535, a fourth recess 537, a second recess 534, or a combination thereof on any line between the third side 531 and the fourth side 533.

According to an embodiment of the present invention, the third recess 535, the fourth recess 537, and the second recess 534 each have a geometric figure. According to an embodiment of the present invention, the geometric shape comprises a triangle, a quadrangle, a pentagon, a hexagon, a circle, a strip, or a combination thereof.

According to an embodiment of the present invention, the apertures of the second recessed holes 534 are each 0.05 to 2.4 mm. According to an embodiment of the present creation, each of the above two adjacent The distance between the second recess 534, the second recess 534 and the third recess 535, the second recess 534 and the fourth recess 537 or a combination thereof is 0.05 to 2.4 mm.

According to an embodiment of the present invention, the lower electrode structure 530 includes a plurality of lower bus electrodes. According to an embodiment of the present invention, the lower bus electrodes extend in a first direction 501.

The solar cell 500b shown in Fig. 15 is similar to the solar cell 300b shown in Fig. 12 except that the lower bus electrodes of the solar cell 500b shown in Fig. 15 have a plurality of first segments 542 and A plurality of second segments 544, and the first segments 542 and the second segments 544 are alternately arranged and connected to each other. According to an embodiment of the present invention, the first segments 542 of the lower bus electrodes have a first bus electrode width (W1). According to an embodiment of the present invention, the first bus electrode width (W1) is 0.5 to 2.5 mm. According to an embodiment of the present invention, the second sections 544 of the lower bus electrodes have a second bus electrode width (W2). According to an embodiment of the present invention, the second bus electrode width (W2) is between 0.05 and 2 mm.

Figure 16 is a top plan view of a printing screen 600, depicted in accordance with one embodiment of the present writing. In Fig. 16, the printing screen 600 includes a mesh layer 610 and a printed pattern layer 620.

A printed pattern layer 620 is disposed on the mesh layer 610. The printed pattern layer 620 has an electrode blanking region 622, a shielding portion 624 and at least one support point 626, wherein the shielding portion 624 is adjacent to the electrode blanking region 622, and the support point 626 is located in the electrode blanking region 622.

In FIG. 16, the electrode blanking area 622 has a plurality of bus electrode blanking areas and a plurality of finger electrode blanking areas, and one of the finger electrode blanking areas The end is connected to the bus electrode blanking region, wherein the bus electrode blanking region extends in the first direction 601, and the finger electrode blanking region extends in the second direction 602. According to an embodiment of the present invention, the width of the blanking regions of the finger electrodes is 0.02 to 0.2 μm. According to an embodiment of the present invention, the first direction 601 and the second direction 602 are vertical. According to an embodiment of the present invention, the angle between the first direction 601 and the second direction 602 is greater than 0 degrees and less than 90 degrees.

The printing screen 600 shown in Fig. 16 is similar to the printing screen 400 shown in Fig. 13. The bus electrode blanking area 622 of the printing screen 600 shown in FIG. 16 has a plurality of first sections 632 and a plurality of second sections 634, and the first sections 632 and the second sections 634 are They are alternately arranged and connected to each other. According to an embodiment of the present invention, the first sections 632 of the bus electrode blanking area 622 have a first bus electrode blanking area width (W1). According to an embodiment of the present invention, the first bus electrode blanking zone width (W1) is 0.5 to 2.5 mm. According to an embodiment of the present invention, the second sections 634 of the bus electrode blanking area 622 have a second bus electrode blanking zone width (W2). According to an embodiment of the present invention, the second bus electrode blanking area width (W2) is between 0.05 and 2 mm.

The printing screen 600 shown in Fig. 16 differs from the printing screen 400 shown in Fig. 13 in the confluent electrode blanking areas of the printing pattern layer 620 of the printing screen 600 shown in Fig. 16. At least one of the first blanking zone 642 and the second blanking zone 644 is unconnected, and the first blanking zone 642 is not connected to the second blanking zone 644.

Figure 17 is a top plan view of a solar cell 700 depicted in accordance with an embodiment of the present invention. In FIG. 17, the solar cell 700 includes a semiconductor substrate 710, an upper electrode structure 703, and a lower electrode structure (not shown).

The semiconductor substrate 710 has an upper surface 712 and a lower surface (not shown) opposite to the upper surface 712. The upper electrode structure 703 is located on the upper surface 712 of the semiconductor substrate 710 and is formed using a printing screen 600 as shown in FIG. The upper electrode structure 703 has a first side 721 and a second side 723 opposite to the first side 721, wherein the first side 721 has at least one first recess 725, and the second side 723 has at least a second side The recess 727 has an upper electrode structure 703 having at least one first recess 724. There is a first recess 725, a second recess 727, a first recess 724, or a combination thereof on either line between the first side 721 and the second side 723.

According to an embodiment of the present invention, the first recess 725, the second recess 727, and the first recess 724 each have a geometric figure. According to an embodiment of the present invention, the geometric shape comprises a triangle, a quadrangle, a pentagon, a hexagon, a circle, a strip, or a combination thereof.

According to an embodiment of the present invention, the apertures of the first recessed holes 724 are each 0.05 to 2.4 mm. According to the embodiment of the present invention, the distance between each of the two adjacent first recessed holes 724, the first recessed holes 724 and the first recessed portion 725, the first recessed hole 724 and the second recessed portion 727 or a combination thereof is 0.05~ 2.4 mm.

According to an embodiment of the present invention, the upper electrode structure 703 includes a plurality of upper bus electrodes 720, a plurality of upper finger electrodes 740, or a combination thereof. According to an embodiment of the present invention, the upper bus electrodes 720 extend in the first direction 701, the upper finger electrodes 740 extend in the second direction 702, and one ends of the upper finger electrodes 740 are connected to the upper bus electrodes 720. Where the second direction 702 is different from the first direction 701. According to an embodiment of the present invention, the upper finger electrodes 740 have a width of 0.02 to 0.2 μm.

The solar cell 700 shown in Fig. 17 is similar to the solar cell 500a shown in Fig. 14. The upper bus electrodes 720 of the solar cell 700 shown in FIG. 17 have a plurality of first segments 742 and a plurality of second segments 744, and the first segments 742 and the second segments 744 are alternately arranged with each other. And connected. According to an embodiment of the present invention, the first segments 742 of the upper bus electrode 720 have a first bus electrode width (W1). According to an embodiment of the present invention, the first bus electrode width (W1) is 0.5 to 2.5 mm. According to an embodiment of the present invention, the second sections 744 of the upper bus electrodes 720 have a second bus electrode width (W2). According to an embodiment of the present invention, the second bus electrode width (W2) is between 0.05 and 2 mm.

The solar cell 700 shown in FIG. 17 is different from the solar cell 500a shown in FIG. 14 in that at least one of the upper bus electrodes 720 of the solar cell 700 shown in FIG. 17 has the first confluence section 752. And the second confluence section 754, and the first confluence section 752 is not connected to the second confluence section 754. According to an embodiment of the present invention, the lower electrode structure (not shown) of the solar cell 700 is the same as the upper electrode structure 703.

Figure 18 is a top plan view of a printing screen 800, depicted in accordance with one embodiment of the present writing. In Fig. 18, the printing screen 800 includes a mesh layer 810 and a printed pattern layer 820.

A printed pattern layer 820 is disposed on the mesh layer 810. The printed pattern layer 820 has an electrode blanking region 822, a shielding portion 824, and at least one support point 826, wherein the shielding portion 824 is adjacent to the electrode blanking region 822, and the support point 826 is located in the electrode blanking region 822.

In FIG. 18, the electrode blanking region 822 has a plurality of bus electrode blanking regions and a plurality of finger electrode blanking regions, and one end of the finger electrode blanking region is connected to the bus electrode blanking region, wherein the bus electrode falls The frit extends in a first direction 801 and the finger electrode blanking region extends in a second direction 802. According to an embodiment of the present invention, the width of the blanking regions of the finger electrodes is 0.02 to 0.2 μm. According to an embodiment of the present invention, the first direction 801 and the second direction 802 are vertical. According to an embodiment of the present invention, the angle between the first direction 801 and the second direction 802 is greater than 0 degrees and less than 90 degrees.

The printing screen 800 shown in Fig. 18 is similar to the printing screen 600 shown in Fig. 16. The bus electrode blanking regions of the printing screen 800 shown in Fig. 18 have a plurality of first segments 832 and a plurality of second segments 834. The difference between the printing screen 800 shown in Fig. 18 and the printing screen 600 shown in Fig. 16 is that the printing screen 800 shown in Fig. 18 has two first sections 832 and one second. The pattern elements formed by the segments 834 are connected in sequence. According to an embodiment of the present invention, the first sections 832 of the bus drop blanking zone have a first bus electrode blanking zone width (W1). According to an embodiment of the present invention, the first bus electrode blanking zone width (W1) is 0.5 to 2.5 mm. According to an embodiment of the present invention, the second sections 834 of the bus electrode blanking area 822 have a second bus electrode blanking area width (W2). According to an embodiment of the present invention, the second bus electrode blanking area width (W2) is between 0.05 and 2 mm.

In addition, at least one of the bus electrode blanking areas 822 of the printing pattern layer 820 of the printing screen 800 shown in FIG. 18 has a first blanking area 842 and a second blanking area 844, and the first blanking area is Zone 842 is not connected to second blanking zone 844.

Figure 19 is a top plan view of a solar cell 900 depicted in accordance with one embodiment of the present invention. . In Fig. 19, the solar cell 900 includes a semiconductor substrate 910, an upper electrode structure 903, and a lower electrode structure (not shown).

The semiconductor substrate 910 has an upper surface 912 and a lower surface (not shown) opposite to the upper surface 912. The upper electrode structure 903 is located on the upper surface 912 of the semiconductor substrate 910 and is formed using a printing screen 800 as shown in FIG. The upper electrode structure 903 has a first side 921 and a second side 923 opposite to the first side 921, wherein the first side 921 has at least one first recess 925, and the second side 923 has at least a second side The recess 927 has an upper electrode structure 903 having at least one first recess 924. There is a first recess 925, a second recess 927, a first recess 924, or a combination thereof on either line between the first side 921 and the second side 923.

According to an embodiment of the present invention, the first recess 925, the second recess 927, and the first recess 924 each have a geometric figure. According to an embodiment of the present invention, the geometric shape comprises a triangle, a quadrangle, a pentagon, a hexagon, a circle, a strip, or a combination thereof.

According to an embodiment of the present invention, the apertures of the first recessed holes 924 are each 0.05 to 2.4 mm. According to the embodiment of the present invention, the distance between each of the two adjacent first recessed holes 924, the first recessed holes 924 and the first recessed portion 925, the first recessed hole 924 and the second recessed portion 927 or a combination thereof is 0.05~ 2.4 mm.

According to an embodiment of the present invention, the upper electrode structure 903 includes a plurality of upper bus electrodes 920, a plurality of upper finger electrodes 940, or a combination thereof. According to an embodiment of the present invention, the upper bus electrodes 920 extend in a first direction 901, the upper finger electrodes 940 extend in a second direction 902, and the upper finger electrodes One end of the 940 is coupled to the upper bus electrodes 920, wherein the second direction 902 is different from the first direction 901. According to an embodiment of the present invention, the upper finger electrodes 940 have a width of 0.02 to 0.2 μm.

The solar cell 900 shown in Fig. 19 is similar to the solar cell 700 shown in Fig. 17. The upper bus electrodes 920 of the solar cell 900 shown in FIG. 19 have a plurality of first segments 942 and a plurality of second segments 944. The solar cell 900 shown in Fig. 19 is different from the solar cell 700 shown in Fig. 17 in that the solar cell 900 shown in Fig. 19 has two first sections 942 and one second section 944. The pattern units are formed and connected in order. According to an embodiment of the present invention, the first sections 942 of the upper bus electrode 920 have a first bus electrode width (W1). According to an embodiment of the present invention, the first bus electrode width (W1) is 0.5 to 2.5 mm. According to an embodiment of the present invention, the second sections 944 of the upper bus electrodes 920 have a second bus electrode width (W2). According to an embodiment of the present invention, the second bus electrode width (W2) is between 0.05 and 2 mm.

In addition, at least one of the upper bus electrodes 920 of the solar cell 900 shown in FIG. 19 has a first confluence section 952 and a second confluence section 954, and the first confluence section 952 is not connected to the second confluence section 954. According to an embodiment of the present invention, the lower electrode structure (not shown) of the solar cell 900 is the same as the upper electrode structure 903.

The present invention discloses a printing screen having a support point. The bus electrode of the solar cell made by using the printed screen has a uniform thickness, which can improve the welding tension of the electrode structure and the module end electrode, and increase the sink electrode and The contact area of the module end electrode is used to improve the electrical contact between the bus electrode and the module end electrode, thereby improving the yield of the solar cell.

Although the embodiments of the present invention have been disclosed as above, it is not intended to limit the present invention. Anyone skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present creation. The scope is defined as defined in the scope of the patent application.

300a‧‧‧ solar cells

301‧‧‧First direction

302‧‧‧second direction

303‧‧‧Upper electrode structure

310‧‧‧Semiconductor substrate

312‧‧‧ upper surface

320‧‧‧Upstream electrode

321‧‧‧ first side

323‧‧‧Second side

324‧‧‧ first recess

325‧‧‧ first recess

327‧‧‧Second recess

340‧‧‧Upper finger electrode

Claims (25)

A printing screen for fabricating a solar cell electrode, comprising: a mesh layer; and a printed pattern layer disposed between the mesh layer and a semiconductor substrate, the printed pattern layer having an electrode blanking region, a shielding portion and at least one supporting point, wherein the shielding portion is adjacent to the electrode blanking region, and the supporting point is located in the electrode blanking region, wherein the electrode blanking region has a first side and is opposite to the first a second side of the side, wherein the first side has at least one first support protrusion formed by the shielding portion, and the second side has at least one second support formed by the shielding portion a bump having the first support bump, the second support bump, the support point, or a combination thereof on any line between the first side edge and the second side edge. The printing screen of claim 1, wherein the electrode blanking region comprises a plurality of bus electrode blanking regions, a plurality of finger electrode blanking regions, or a combination thereof. The printing screen of the second aspect of the invention, wherein the bus electrode blanking area has a plurality of first sections and a plurality of second sections, the first sections and the second sections They are alternately arranged and connected to each other. The printing screen according to claim 3, wherein the first sections of the confluent electrode blanking areas have a first confluent electrode blanking area width, and the first confluent electrode blanking area width is 0.5~2.5 mm. The printing screen according to claim 3, wherein the second sections of the bus electrode blanking areas have a second bus electrode blanking area width, and the second bus electrode blanking area width Between 0.05 and 2 mm. The printing screen of the second aspect of the invention, wherein at least one of the plurality of confluent electrode blanking areas of the printing pattern layer has a first blanking area and a second blanking area, and the first The blanking zone is not connected to the second blanking zone. The printing screen according to claim 2, wherein the confluent electrode blanking regions extend along a first direction, the finger electrode blanking regions extend along a second direction, and the fingers One end of the blanking region of the electrode is connected to the confluent regions of the confluent electrodes. The printing screen as described in claim 2, wherein the finger electrode blanking area has a width of 0.02 to 0.2 μm. The printing screen according to claim 1, wherein the first supporting protrusion, the second supporting protrusion and the supporting point each have a geometric figure. The printing screen of claim 9, wherein the geometric shape comprises a triangle, a quadrangle, a pentagon, a hexagon, a circle, a strip, or a combination thereof. The printing screen as described in claim 1, wherein the support point has a diameter of 0.05 to 2.4 mm. The printing screen according to claim 1, wherein each of the two adjacent support points, the support point and the first support protrusion, The distance between the support point and the second support bump or a combination thereof is 0.05 to 2.4 mm. A solar cell comprising: a semiconductor substrate having an upper surface and a lower surface opposite to the upper surface; an upper electrode structure located on the upper surface of the semiconductor substrate, the upper electrode structure utilizing the first item of claim The printing screen is formed and has a first side and a second side opposite to the first side, wherein the first side has at least one first recess, and the second side Having at least one second recess, the upper electrode structure having at least one first recess, and having the first recess, the second recess, and the line between the first side and the second side a first recess or a combination thereof; and a lower electrode structure on the lower surface of the semiconductor substrate, the lower electrode structure being formed by using a printing screen as claimed in claim 1 and having a third side And a fourth side of the third side, wherein the third side has at least one third recess, and the fourth side has at least one fourth recess, the lower electrode structure has at least a second a recessed hole and on the third side Between any of the four sides of the straight line having a third recess and the fourth recess portion, the second recesses, or combinations thereof. The solar cell of claim 13, wherein the upper electrode structure comprises a plurality of upper bus electrodes, a plurality of upper finger electrodes or a combination thereof, and the lower electrode structure comprises a plurality of lower bus electrodes and a plurality of lower electrodes A finger electrode or a combination thereof, wherein one end of the upper finger electrodes is connected to the upper bus electrodes, and one ends of the lower finger electrodes are connected to the lower bus electrodes. The solar cell of claim 14, wherein the upper bus electrodes and the lower bus electrodes extend in a first direction, and the upper finger electrodes and the lower finger electrodes are along a first The two directions are extended, and one ends of the upper finger electrodes and the lower finger electrodes are respectively connected to the upper bus electrodes or the lower bus electrodes, wherein the second direction is different from the first direction. The solar cell of claim 14, wherein the upper bus electrodes, the lower bus electrodes or a combination thereof have a plurality of first segments and a plurality of second segments, the first segments and The second sections are alternately arranged and connected to each other. The solar cell of claim 16, wherein the first sections have a first upper bus electrode width, and the first upper bus electrode has a width of 0.5 to 2.5 mm. The solar cell of claim 16, wherein the second sections have a second upper bus electrode width, and the second upper bus electrode width is between 0.05 and 2 mm. The solar cell of claim 14, wherein at least one of the upper bus electrodes, the lower bus electrodes, or a combination thereof has a first bus segment and a second bus segment, and the first bus bar The segment is not connected to the second bus segment. The solar cell of claim 13, wherein the first recess, the second recess, the third recess, the fourth recess, the first recess and the second recess each have a geometric shape . The solar cell of claim 20, wherein the geometric shape comprises a triangle, a quadrangle, a pentagon, a hexagon, a circle, a strip, or a combination thereof. The solar cell of claim 13, wherein the apertures of the first recess and the second recess are each independently 0.05 to 2.4 mm. The solar cell of claim 13, wherein each of the two adjacent first recesses, the first recesses and the first recesses, the first recesses and the second recesses or a combination thereof The distance between them is 0.05~2.4 mm. The solar cell of claim 13, wherein each of the two adjacent second recesses, the second recesses and the third recesses, the second recesses and the fourth recesses or a combination thereof The distance between them is 0.05~2.4 mm. The solar cell of claim 14, wherein the upper finger electrodes, the lower finger electrodes or a combination thereof has a width of 0.02 to 0.2 μm.