TWM504356U - Four-bus-bar solar cell - Google Patents

Abstract

A four-bus-bar solar cell includes a substrate, four bus bars, and an antireflective layer. The substrate has a first surface and a second surface opposite to the first surface. The bus bars are disposed on the first surface of the substrate. The width of the bus bars is about 0.5 mm to about 1.0 mm, and the distance between the bus bars is about 40 mm to about 50 mm. The reflective layer is disposed on the first surface.

Description

Four-gate busbar solar cell

This creation is about a solar cell, and further, it relates to a four-gate bus solar cell.

With the depletion of petroleum energy and the development of environmental protection concepts, the development of alternative new energy sources has become the goal of the industry's current research. The new energy that can be used for development should have the advantages of being rich, not exhausted, safe, clean, not threatening human beings and destroying the environment. For example, renewable energy such as solar energy, wind power, and water power can meet the above conditions. The advantages of energy saving and environmental protection.

Solar cells, also known as photovoltaics, can be used to convert solar energy into energy. Solar cells that are widely used today are capable of generating photocurrents when absorbing light energy, which can be collected and remitted by electrodes in solar cells. However, how to design the structure of the electrode to improve the output efficiency of the photocurrent is an important issue in the development of solar energy technology.

One aspect of this creation provides a four-gate bus solar power The cell comprises a substrate, four main gate electrodes and an anti-reflection layer. The substrate has a first surface and a second surface opposite the first surface. The main gate electrode is placed on the first surface of the substrate. The width of the main gate electrode is from about 0.5 mm to about 1.0 mm, and the spacing between the main gate electrodes is from about 40 mm to about 50 mm. The anti-reflective layer is placed on the first surface of the substrate.

In one or more embodiments, the four-gate bus solar cell further includes a plurality of finger electrodes disposed on the first surface of the substrate and interleaved with the main gate electrode. The finger electrodes have a width of from about 0.03 mm to about 0.06 mm.

In one or more embodiments, the distance between the finger electrodes is from about 1.3 mm to about 1.6 mm.

In one or more embodiments, the number of finger electrodes is from about 80 to about 110.

In one or more embodiments, the four-gate bus solar cell further includes a plurality of electrode strips disposed on the second surface of the substrate.

In one or more embodiments, the projection of the electrode strip on the substrate overlaps the projection of the main gate electrode on the substrate.

In one or more embodiments, the four-gate bus solar cell further includes a passivation layer disposed on the second surface of the substrate.

In one or more embodiments, the passivation layer has a plurality of openings. The electrode strip contacts the substrate through the opening.

In one or more embodiments, the substrate includes a first semiconductor layer and a second semiconductor layer. The second semiconductor layer is interposed between the main gate electrode and the first semiconductor layer.

In one or more embodiments, the width of the main gate electrode is about 1.0 mm and the spacing between the main gate electrodes is about 40 mm.

The four-gate busbar solar cell of the above embodiment can increase the efficiency of collecting carriers and shorten the path of carriers in the solar cell to the main gate electrode without increasing the production cost.

110‧‧‧Substrate

112‧‧‧ first surface

114‧‧‧ second surface

116‧‧‧First semiconductor layer

118‧‧‧Second semiconductor layer

120‧‧‧Main gate electrode

130‧‧‧Anti-reflective layer

140‧‧‧ finger electrode

150‧‧‧electrode strip

160‧‧‧ Passivation layer

162‧‧‧ openings

2-2‧‧‧ segments

D1, d2‧‧‧ spacing

W1, W2‧‧‧ width

1 is a top view of a four-gate bus solar cell according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view taken along line 2-2 of Fig. 1.

Figure 3 is a bottom view of the four-gate busbar solar cell of Figure 1.

Fig. 4 is a side view of a solar cell according to another embodiment of the present invention.

In the following, a plurality of embodiments of the present invention will be disclosed in the drawings, and for the sake of clarity, many practical details will be described in the following description. However, it should be understood that these practical details are not applied to limit the creation. That is to say, in the implementation part of this creation, these practical details are not necessary. In addition, some of the conventional structures and elements are shown in the drawings in a simplified schematic manner in order to simplify the drawings.

1 is a top view of a four-gate bus solar cell according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1. As shown in the figure, a four-grid busbar solar cell (hereinafter referred to as "solar cell") package The substrate 110, the four main gate electrodes 120 and the anti-reflection layer 130 are included. The substrate 110 has a first surface 112 and a second surface 114 opposite the first surface 112. The main gate electrode 120 is placed on the first surface 112 of the substrate 110. The width W1 of the main gate electrode 120 is about 0.5 mm to about 1.0 mm, and the pitch d1 between the main gate electrodes 120 is about 40 mm to about 50 mm. The anti-reflective layer 130 is placed on the first surface 112 of the substrate 110.

The solar cell of the present embodiment can increase the efficiency of collecting carriers and reduce the path of carriers in the solar cell to the main gate electrode 120 without increasing the production cost. Specifically, the first surface 112 of the substrate 110 may be a light incident surface, that is, light enters the solar cell from a side of the first surface 112. When light is incident on the solar cell, a photoelectric effect is generated in the substrate 110, so that incident light (light energy) is converted into photocurrent (electric energy). The rear substrate 110 then generates a carrier that flows from the substrate 110 to the main gate electrode 120 and then is discharged by the main gate electrode 120 to an external load. Since the solar cell of the present embodiment includes four main gate electrodes 120, the number of which is larger than that of the conventional solar cell, the efficiency of collecting carriers can be improved. In addition, the pitch d1 of the main gate electrode 120 of the present embodiment is about 40 mm to about 50 mm, which is smaller than the pitch of the conventional solar cell, that is, the farthest horizontal flow distance of the carrier is about 20 mm to about 25. In millimeters, the shortening of the flow distance means that the resistance of the solar cell becomes small, so that the efficiency of collecting the carriers is also effectively increased. In addition, the main gate electrode 120 of the present embodiment can be formed, for example, by a screen printing process, so that the manufacturing cost is not increased and the process steps are not increased compared with the conventional solar cell. Further, in conjunction with the width W1 and the spacing d1 of the main gate electrode 120 of the present embodiment, the main gate electrode 120 is entirely on the substrate 110. The coverage is less than that of traditional solar cells. The reduction in coverage mainly indicates that the contact area between the main gate electrode 120 and the substrate 110 becomes small, and thus the cost of the main gate electrode 120 can be reduced. In addition, the main gate electrode 120 may be silver glue or aluminum glue, and the present invention is not limited thereto.

In the present embodiment, the substrate 110 may include a first semiconductor layer 116 and a second semiconductor layer 118. The second semiconductor layer 118 is disposed between the main gate electrode 120 and the first semiconductor layer 116, and the main gate electrode 120 directly contacts the second semiconductor layer 118. The substrate 110 may be a crystalline germanium, such as a single crystal germanium or a polycrystalline germanium, and the second semiconductor layer 118 may be a phosphorus doped layer. In other embodiments, the solar cell may also be a dye-sensitized battery, and the present invention is not limited thereto. In some embodiments, the width W1 of the main gate electrode 120 is about 1.0 mm, and the pitch d1 between the main gate electrodes 120 is about 40 mm, which is not limited thereto.

In the present embodiment, the anti-reflective layer 130 is disposed on the first surface 112 (ie, the light incident surface) of the substrate 110. When the material and the thickness thereof are matched, the anti-reflective layer 130 can reflect the light reflected from the substrate 110. The substrate 110 is returned, so that the amount of light collected by the solar panel can be increased. In some embodiments, the material of the anti-reflective layer 130 is, for example, tantalum nitride. However, the present invention is not limited thereto.

Next, returning to FIG. 1 , in the present embodiment, the solar cell further includes a plurality of finger electrodes 140 disposed on the first surface 112 of the substrate 110 and interlaced with the main gate electrode 120 . For example, the finger electrodes 140 and the main gate electrode 120 are perpendicular to each other. The width W2 of the finger electrode 140 is about 0.03 mm to about 0.06 mm, and the distance d2 between the finger electrodes 140 is about 1.3 mm to about 1.6 mm. Specifically, the finger electrodes 140 may be disposed between the adjacent two main gate electrodes 120 and electrically connected to the at least one main gate electrode 120 to increase the efficiency of collecting the carriers. The carrier generated by the substrate 110 may first reach the finger electrode 140 and then reach the main gate electrode 120 along the finger electrode 140. Since the materials of the finger electrode 140 and the main gate electrode 120 are all conductive materials, such as metals (such as nickel, silver, aluminum, copper or a combination thereof), the finger electrodes 140 can further reduce the resistance value of the path for collecting the carriers. To increase the efficiency of collecting carriers.

In addition, since the number of the main gate electrodes 120 of the present embodiment is larger than that of the conventional solar cells, the number of the finger electrodes 140 may be smaller than that of the conventional finger electrodes, and the number thereof is, for example, about 80 to about 110. That is, the efficiency of collecting current that can match the conventional solar cell can be achieved, and thus the cost of the finger electrode 140 can be reduced. In addition, although the main gate electrode 120 and the finger electrode 140 are both rectangular in FIG. 1, the present invention is not limited thereto. In other embodiments, the main gate electrode 120 and the finger electrode 140 may be elongated, wavy or other suitable shapes, and the main gate electrode 120 and the finger electrode 140 may be the same shape or different shapes. Further, the main gate electrode 120 and the finger electrode 140 may also be non-perpendicular. Basically, as long as the finger electrode 140 is electrically connected to the main gate electrode 120, it is within the scope of the present invention.

Please refer to FIG. 2 and FIG. 3 together, wherein FIG. 3 is a bottom view of the four-gate bus solar cell of FIG. 1 . In the present embodiment, the solar cell further includes a plurality of electrode strips 150 disposed on the second surface 114 of the substrate 110. When a plurality of solar cells constitute a solar cell module, the main gate electrode 120 of one solar cell and the electrode strip 150 of another solar cell Electrically connected, the current of the main gate electrode 120 can be directed to the electrode strip 150 of another solar cell, so the solar cells can be connected in series to increase the voltage of the solar cell module.

In one or more embodiments, the projection of the electrode strip 150 on the substrate 110 overlaps the projection of the main gate electrode 120 on the substrate 110. In other words, the position of the electrode strip 150 corresponds to the position of the main gate electrode 120. Limited. In addition, please refer to Figure 1 and Figure 3 together. In Fig. 3, there are a total of 16 electrode strips 150, each of which is arranged along the extending direction of the main gate electrode 120, and each electrode strip 150 is separated from each other. This structure is called a segmented structure. However, in other embodiments, the number of electrode strips 150 may be four and the shape is the same as that of the main gate electrode 120 (ie, elongated), and the end is designed according to the actual situation.

Next, please refer to FIG. 4, which is a side view of a solar cell according to another embodiment of the present invention. The difference between this embodiment and the embodiment of FIG. 2 lies in the passivation layer 160. In the present embodiment, the solar cell further includes a passivation layer 160 disposed on the second surface 114 of the substrate 110. The passivation layer 160 can reduce the probability of the carriers being bonded to the second surface 114 to increase the photoelectric flow of the solar cell. The passivation layer 160 has a plurality of openings 162. The electrode strips 150 contact the substrate 110 through the openings 162, thereby being electrically connected to the substrate 110. In other words, the electrode strip 150 is exposed by the passivation layer 160. The material of the passivation layer 160 is, for example, aluminum oxide or tantalum nitride. However, the present invention is not limited thereto. The details of the present embodiment are similar to those of FIG. 2, and therefore will not be described again.

In summary, the four-gate bus solar cell of the above embodiment includes four main gate electrodes, and the number thereof is larger than that of the conventional solar cell. More, so the efficiency of collecting carriers can be improved. In addition, the spacing of the main gate electrodes is smaller than that of the conventional solar cells, so the efficiency of collecting carriers is also effectively increased. In addition, the main gate electrode can be formed by a screen printing process, and the manufacturing cost is not increased compared with the conventional solar cell. Furthermore, in combination with the width and pitch design of the above-mentioned main gate electrode, the main gate electrode coverage is less than that of the conventional solar cell, which helps to reduce the overall weight of the solar cell and reduce the cost. In addition, since the number of main gate electrodes is larger than that of the conventional solar cells, the number of finger electrodes can be smaller than that of the conventional finger electrodes, that is, the efficiency of collecting currents matched with the conventional solar cells can be achieved.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any person skilled in the art can make various changes and refinements without departing from the spirit and scope of the present creation. The scope is subject to the definition of the scope of the patent application attached.

120‧‧‧Main gate electrode

130‧‧‧Anti-reflective layer

140‧‧‧ finger electrode

2-2‧‧‧ segments

D1, d2‧‧‧ spacing

W1, W2‧‧‧ width

Claims (10)

A four-gate bus solar cell comprising: a substrate having a first surface and a second surface opposite to the first surface; and four main gate electrodes disposed on the first surface of the substrate, wherein the main The width of the gate electrode is from about 0.5 mm to about 1.0 mm, and the spacing between the main gate electrodes is from about 40 mm to about 50 mm; and an anti-reflective layer is disposed on the first surface of the substrate. The four-gate bus solar cell of claim 1, further comprising: a plurality of finger electrodes disposed on the first surface of the substrate and interleaved with the main gate electrodes, wherein the finger electrodes The width is from about 0.03 mm to about 0.06 mm. The four-grid busbar solar cell of claim 2, wherein the distance between the finger electrodes is between about 1.3 mm and about 1.6 mm. The four-grid busbar solar cell of claim 2, wherein the number of the finger electrodes is from about 80 to about 110. The four-gate bus solar cell of claim 1, further comprising: a plurality of electrode strips disposed on the second surface of the substrate. The four-gate bus solar cell of claim 5, wherein the projection of the electrode strips on the substrate overlaps projection of the main gate electrodes on the substrate. The four-gate bus solar cell of claim 5, further comprising: a passivation layer disposed on the second surface of the substrate. The four-gate bus solar cell of claim 7, wherein the passivation layer has a plurality of openings, and the electrode strips contact the substrate by the openings. The four-gate bus solar cell of claim 1, wherein the substrate comprises: a first semiconductor layer; and a second semiconductor layer disposed between the main gate electrodes and the first semiconductor layer. The four-gate bus solar cell of claim 1, wherein the width of the main gate electrodes is about 1.0 mm, and the spacing between the main gate electrodes is about 40 mm.