KR20180072110A - Solar cell and solar cell panel including the same - Google Patents

Abstract

A solar cell according to an embodiment of the present invention includes: a semiconductor substrate; a conductive region formed in the semiconductor substrate or on the semiconductor substrate; and an electrode electrically connected to the conductive region. The lateral side of the semiconductor substrate includes a first cut section and a second cut section crossing each other, a first non-cut section parallel to the first cut section, and a second non-cut section parallel to the second cut section. Accordingly, the present invention can reduce manufacturing costs.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a solar cell,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell and a solar cell panel including the same. More particularly, the present invention relates to a solar cell improved in structure and a solar cell panel including the same.

With the recent depletion of existing energy sources such as oil and coal, interest in alternative energy to replace them is increasing. Among them, solar cells are attracting attention as a next-generation battery that converts solar energy into electric energy. In solar cells, various layers and electrodes can be fabricated by design. The solar cell efficiency can be determined by the design of these various layers and electrodes.

Since the solar cell must be exposed to the external environment for a long time, it is manufactured in the form of a solar cell panel by a packaging process for protecting the solar cell. In the solar cell panel, the output, manufacturing process and cost of the solar cell panel vary depending on the structure, arrangement and connection structure of the solar cell.

Therefore, the structure, arrangement and connection structure of the solar cell in the solar cell panel is required to be designed and manufactured so as to improve the output of the solar cell panel, simplify the manufacturing process, and reduce the manufacturing cost.

The present invention provides a solar cell panel capable of improving the output of the solar cell panel and simplifying the manufacturing process and reducing the manufacturing cost, and a solar cell included therein.

A solar cell according to this embodiment includes: a semiconductor substrate; A conductive type region formed on the semiconductor substrate or on the semiconductor substrate; And an electrode electrically connected to the conductive region, wherein a side surface of the semiconductor substrate has a first and a second crossing surface intersecting with each other, a first non-cutting surface parallel to the first cutting surface, And a second parallel non-cut surface.

A solar cell according to this embodiment includes a plurality of unit solar cell regions which are divided along first and second cutting lines intersecting each other. Wherein the plurality of unit solar cell regions are located in plural in a first direction and in plural in a second direction intersecting with the first direction, the first cutting line is formed parallel to one edge of the solar cell, A second cut line is formed parallel to the other edge of the solar cell, and the shape and the area of the plurality of unit solar cell regions are equal to each other.

The solar cell panel according to the present embodiment includes a plurality of solar cells including a first solar cell and a second solar cell electrically connected to each other; And each of the first and second solar cells comprises: a semiconductor substrate; A conductive type region formed on the semiconductor substrate or on the semiconductor substrate; And an electrode electrically connected to the conductive region, wherein the side surfaces of the first and second solar cells are divided into a first cut surface and a second cut surface which intersect each other, a first non cut surface parallel to the first cut surface, And a second non-cut surface parallel to the second cut surface.

According to this embodiment, a plurality of unit solar cells manufactured from one parent solar cell have the same shape, have the same area, and have substantially the same amount of current. Thus, the appearance and stability of the solar cell panel can be improved. In addition, it is possible to freely change the arrangement and connection structure of the unit solar cells in the solar cell panel. In addition, in the solar cell panel, the area of the overlapped portion where the unit solar cells are overlapped with each other can be reduced to reduce a dead area in which photoelectric conversion does not occur and a connecting member for connecting the unit solar cells, The area of the electrodes and the like can be reduced. Thus, the manufacturing cost of the solar cell panel can be reduced and the output can be improved.

1 is a front plan view and a rear plan view of one mother solar cell according to an embodiment of the present invention.
2 is a front plan view showing four unit solar cells formed by cutting the parent solar cell shown in FIG.
3 is a schematic cross-sectional view cut along the line III-III in Fig.
4 is a front plan view showing four unit solar cells formed by cutting a parent solar cell according to another embodiment of the present invention.
5 is a front plan view showing four unit solar cells formed by cutting a parent solar cell according to another embodiment of the present invention.
6 is a front plan view showing four unit solar cells formed by cutting a parent solar cell according to another embodiment of the present invention.
7 is a front plan view showing four unit solar cells formed by cutting a parent solar cell according to another embodiment of the present invention.
8 is a schematic cross-sectional view of a solar cell panel including the unit solar cells shown in Figs. 1 to 3. Fig.
FIG. 9 is a cross-sectional view schematically showing two unit solar cells included in the solar cell panel shown in FIG. 8 and connected to each other by connecting members.
10 is a schematic plan view of the solar cell panel shown in Fig.
11 is a schematic plan view of a solar cell panel according to another embodiment of the present invention.
12 is a schematic plan view of a solar cell panel according to another embodiment of the present invention.
13 is a schematic plan view of a solar cell panel according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it is needless to say that the present invention is not limited to these embodiments and can be modified into various forms.

In the drawings, the same reference numerals are used for the same or similar parts throughout the specification. In the drawings, the thickness, the width, and the like are enlarged or reduced in order to make the description more clear, and the thickness, width, etc. of the present invention are not limited to those shown in the drawings.

Wherever certain parts of the specification are referred to as "comprising ", the description does not exclude other parts and may include other parts, unless specifically stated otherwise. Also, when a portion of a layer, film, region, plate, or the like is referred to as being "on" another portion, it also includes the case where another portion is located in the middle as well as the other portion. When a portion of a layer, film, region, plate, or the like is referred to as being "directly on" another portion, it means that no other portion is located in the middle.

Hereinafter, a solar cell and a solar cell panel including the solar cell according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front plan view and a rear plan view showing one mother solar cell according to an embodiment of the present invention. FIG. 2 is a plan view showing four unit solar cells formed by cutting the parent solar cell shown in FIG. 1 It is a front plan view. 3 is a schematic cross-sectional view cut along the line III-III in Fig.

Referring to Figs. 1 to 3, the parent solar cell 100a according to the present embodiment includes a plurality of unit solar cell regions 100b partitioned along cutting lines (or lines to be cut) CL1 and CL2 . At this time, the electrodes 42 and 44 in one unit solar cell area 100b are separated from each other and separated from the other unit solar cell area 100b. A plurality of solar cells (i.e., the unit solar cells 100) are manufactured by cutting the parent solar cell 100a along the cutting lines CL1 and CL2. Each of the unit solar cells 100 functions as one solar cell.

The unit solar cell 100 in this embodiment includes a semiconductor substrate 10, conductive type regions 20 and 30 formed on the semiconductor substrate 10 or on the semiconductor substrate 10, 30, respectively. The conductive regions 20 and 30 may include a first conductive type region 20 and a second conductive type region 30 having different conductivity types and the electrodes 42 and 44 may include a first conductive type Type region 20 and a second electrode 44 connected to the second conductivity type region 30. The first electrode 42 and the second electrode 44 may be connected to each other. And may further include an insulating film such as a first passivation film 22, an antireflection film 24, and a second passivation film 32.

As described above, since the unit solar cell 100 is formed by cutting the parent solar cell 100a, the cut surface CS exists on the side surface of the unit solar cell 100 or the semiconductor substrate 10. More specifically, in this embodiment, the side surface of the semiconductor substrate 10 is divided into a first section CS1 and a second section CS2 intersecting with each other, a first non-section NCS1 parallel to the first section CS1, , And a second non-cut surface (NCS2) parallel to the second cut surface (CS2). Here, the fact that the cut planes CS1 and CS2 and the non-cut planes NCS1, NCS2 and NCS3 are parallel or orthogonal means not only that the entire planes are parallel or orthogonal, but also that the semiconductor substrate 10 has a cut surface CS1 , And CS2 and the edges of the semiconductor substrate 10 formed by the non-cut surfaces NCS1, NCS2, and NCS3 may be parallel or orthogonal to each other.

The semiconductor substrate 10 may include a base region 110 having a first or second conductivity type including a first or a second conductivity type dopant at a relatively low doping concentration. As an example, the base region 110 may have a second conductivity type. The base region 110 may be comprised of a single crystalline semiconductor (e.g., a single single crystal or polycrystalline semiconductor, such as single crystal or polycrystalline silicon, particularly monocrystalline silicon) comprising a first or second conductivity type dopant. The base region 110 having a high degree of crystallinity and having few defects or the unit solar cell 100 based on the semiconductor substrate 10 has excellent electrical characteristics.

An anti-reflection structure capable of minimizing reflection can be formed on the front surface and the rear surface of the semiconductor substrate 10. For example, a texturing structure having a concavo-convex shape in the form of a pyramid or the like may be provided as an antireflection structure. The texturing structure formed in the semiconductor substrate 10 may have a certain shape (e.g., a pyramid shape) having an outer surface formed along a specific crystal plane (e.g., (111) plane) of the semiconductor. If the surface roughness of the semiconductor substrate 10 is increased due to the unevenness formed on the front surface of the semiconductor substrate 10 by such texturing, the reflectance of light incident into the semiconductor substrate 10 can be reduced to minimize optical loss. However, the present invention is not limited thereto, and a texturing structure may be formed on only one side of the semiconductor substrate 10, or a texturing structure may not be formed on the front and back sides of the semiconductor substrate 10.

A first conductivity type region 20 having a first conductivity type may be formed on one side (e.g., a front side) of the semiconductor substrate 10. And a second conductive type region 30 having a second conductive type may be formed on the rear side of the semiconductor substrate 10. [ The first and second conductivity type regions 20 and 30 may have a different conductivity type than the base region 110 or may have a higher doping concentration than the base region 110 when the first and second conductivity type regions 20 and 30 have the same conductivity type as the base region 110 I have.

In this embodiment, the first and second conductivity type regions 20 and 30 may be formed as a doped region constituting a part of the semiconductor substrate 10. The first conductive type region 20 may be composed of a crystalline semiconductor (e.g., a single crystal or polycrystalline semiconductor, for example, single crystal or polycrystalline silicon, particularly monocrystalline silicon) including a first conductive type dopant. And the second conductivity type region 30 may be composed of a crystalline semiconductor (e.g., a single crystal or a polycrystalline semiconductor, for example, a single crystal or a polycrystalline silicon, particularly, a single crystal silicon) including a second conductive type dopant. As described above, when the first and second conductivity type regions 20 and 30 constitute a part of the semiconductor substrate 10, the junction characteristics with the base region 110 can be improved.

However, the present invention is not limited thereto, and at least one of the first and second conductivity type regions 20 and 30 may be formed separately from the semiconductor substrate 10 on the semiconductor substrate 10. In this case, a semiconductor layer (for example, an amorphous semiconductor layer, an amorphous semiconductor layer, or the like) having a crystal structure different from that of the semiconductor substrate 10 is formed so that the first or second conductivity type regions 20 and 30 can be easily formed on the semiconductor substrate 10, A microcrystalline semiconductor layer, or a polycrystalline semiconductor layer, for example, an amorphous silicon layer, a microcrystalline silicon layer, or a polycrystalline silicon layer).

One of the first and second conductivity type regions 20 and 30, which has a conductivity type different from that of the base region 110, constitutes at least a part of the emitter region. The emitter region forms a pn junction with the base region 110 to produce a carrier by photoelectric conversion. The other of the first and second conductivity type regions 20 and 30 having the same conductivity type as the base region 110 constitutes at least a part of a surface field region. The electric field region forms an electric field that prevents carriers from being lost by recombination on the surface of the semiconductor substrate 10. [ For example, in this embodiment, the base region 110 has the second conductivity type, the first conductivity type region 20 constitutes the emitter region, and the second conductivity type region 30 constitutes the rear electric field region can do. However, the present invention is not limited thereto.

In the drawing, the first conductive type region 20 is formed as a whole and has a homogeneous structure having a uniform doping concentration, and the second conductive type region 30 is formed only in the region where the second electrode 44 is located, As shown in FIG. By minimizing the area of the second conductivity type region 30 as described above, the short-circuit current (Jsc) and the open-circuit voltage can be improved by reducing the recombination. However, the present invention is not limited thereto. Thus, the first conductive type region 20 may be a uniform structure or a selective structure, and the second conductive type region 30 may have a uniform structure, an optional structure, or a local structure. The selective structure has a high doping concentration, a large junction depth, and a low resistance in a portion adjacent to the first or second electrode 42 or 44 in the first or second conductivity type region 20 or 30, Doping concentration, small junction depth, and high resistance.

The first or second conductivity type dopant may be n-type or p-type. As the p-type dopant, a group III element such as boron (B), aluminum (Al), gallium (Ga), or indium (In) can be used. In the case of the n-type, Group 5 elements such as phosphorus (P), arsenic (As), bismuth (Bi) and antimony (Sb) can be used. For example, the p-type dopant may be boron (B) and the n-type dopant may be phosphorus (P).

For example, in this embodiment, the base region 110 and the second conductivity type region 30 may have an n-type and the first conductivity type region 20 may have a p-type. Then, the base region 110 and the first conductivity type region 20 form a pn junction. When the pn junction is irradiated with light, electrons generated by the photoelectric effect move toward the rear surface of the semiconductor substrate 10 and are collected by the second electrode 44, and the holes move toward the front surface of the semiconductor substrate 10 1 electrode 42. In this case, Thereby, electric energy is generated. Then, holes having a slower moving speed than electrons may move to the front surface of the semiconductor substrate 10, rather than the rear surface thereof, thereby improving the efficiency. However, the present invention is not limited thereto, and it is also possible that the base region 110 and the second conductivity type region 30 have a p-type and the first conductivity type region 20 has an n-type.

The first passivation film 22 and / or the second passivation film 22 are formed on at least the front surface of the semiconductor substrate 10 (more precisely, on the first conductive type region 20 formed on the front surface of the semiconductor substrate 10) Barrier film 24 may be located. The second passivation film 32 as the second insulating film can be located at least on the rear surface of the semiconductor substrate 10 (more precisely on the second conductive type region 30 formed on the rear surface of the semiconductor substrate 10) have. The first passivation film 22 and the second passivation film 32 may be formed in contact with the semiconductor substrate 10 and / or the antireflection film 24 may be formed in contact with the first passivation film 22 . Then, the structure can be simplified. However, the present invention is not limited thereto.

The first passivation film 22 and the antireflection film 24 may be formed entirely on the front surface of the semiconductor substrate 10 except for the first opening 102. [ The second passivation film 32 may be formed entirely on the rear surface of the semiconductor substrate 10 except for the second opening 104. In the drawing, the first and second passivation films 22 and 32 and the antireflection film 24 are formed to extend to the side surface of the semiconductor substrate 10. According to this, the side surface of the semiconductor substrate 10 is also passivated, so that the passivation characteristic can be improved.

The first passivation film 22 or the second passivation film 32 is formed in contact with the semiconductor substrate 10 to passivate defects existing in the front surface or bulk of the semiconductor substrate 10. [ Accordingly, it is possible to increase the open-circuit voltage of the unit solar cell 100 by removing recombination sites of the minority carriers. The antireflection film 24 can reduce the reflectance of light incident on the front surface of the semiconductor substrate 10 and increase the amount of light reaching the pn junction. Accordingly, the short circuit current Isc of the unit solar cell 100 can be increased.

The first passivation film 22, the antireflection film 24, and the second passivation film 32 may be formed of various materials. In one example, the first passivation film 22, the anti-reflection film 24 or the passivation film 32 is a silicon nitride film, a silicon nitride film containing hydrogen, silicon oxide, silicon nitride oxide, aluminum oxide film, a silicon carbide film, MgF _2, ZnS , TiO _2, and CeO ₂ , or a multi-layer structure in which two or more films are combined.

For example, in the present embodiment, the first passivation film 22 and / or the antireflection film 24 and the second passivation film 32 may not have a dopant or the like so as to have excellent insulating properties, passivation properties, and the like . However, the present invention is not limited thereto.

The first electrode 42 is formed by filling at least a portion of the first opening 102 and is electrically connected to the first conductive region 20 2 opening portion 104 and is electrically connected to (e.g., formed in contact with) the second conductive type region 30. [0050] The first and second electrodes 42 and 44 are made of various conductive materials (for example, metal) and may have various shapes. This will be described in detail later.

In the parent solar cell 100a, the first and second conductive regions 20 and 30 and / or the first and second electrodes 42 and 44 are separately located in each unit solar cell region 100b, The first and second conductivity type regions 20 and 30 and / or the first and second electrodes 42 and 44 in each unit solar cell region 100b may be spaced apart from each other. For example, the first and second conductivity type regions 32 and 34 and / or the first and second electrodes 42 and 44 are formed at the edge portions of the unit solar cell regions 100b in the parent solar cell 100a Non-active area (NAA) may be located. The first and second conductivity type regions 32 and 34 and the first and second electrodes 42 and 44 are positioned in the inactive region NAA and the active region AA where the photoelectric conversion occurs is positioned. According to this, it is possible to effectively prevent the occurrence of a short circuit or the like when cutting along the cutting line CL. However, the present invention is not limited thereto, and the first and second conductivity type regions 20 and 30 and / or the first and second electrodes 42 and 44 may be continuously and irrespective of the cutting lines CL1 and CL2. .

In this embodiment, as described above, one mother solar cell 100a is cut along the cutting lines CL1 and CL2 to manufacture a plurality of unit solar cells 100. [ When the parent solar cell 100a is separated into a plurality of unit solar cells 100, the output (hereinafter referred to as " 200 " in Fig. 8) of the solar cell panel Loss (cell to module loss, CTM loss) can be reduced.

More specifically, the output loss has a value obtained by multiplying the square of the current by the resistance of each solar cell, and the output loss of the solar cell panel including a plurality of solar cells is expressed by the square of the current of each solar cell The value multiplied by the resistance multiplied by the number of solar cells. However, there is a current generated by the solar cell area itself in the current of each solar cell. When the area of the solar cell is increased, the corresponding current is also increased, and when the area of the solar cell is decreased, the corresponding current is also decreased.

Therefore, when the solar cell panel 200 is formed by using the unit solar cell 100 manufactured by cutting the parent solar cell 100a, the current of the unit solar cell 100 is reduced in proportion to the area, 100) increases in the opposite direction. For example, when there are four unit solar cells 100 manufactured from the parent solar cell 100a, the current in each unit solar cell 100 is reduced to one fourth of the current of the parent solar cell 100a And the number of unit solar cells 100 is four times that of the parent solar cell 100a. Then, the output loss value becomes smaller by a factor of four. Accordingly, the output loss of the solar cell panel 200 according to the present embodiment can be reduced.

In this embodiment, the parent solar cell 100a is manufactured and then cut to form the unit solar cell 100 as in the conventional case. According to this, the unit solar cell 100 can be manufactured by manufacturing the solar cell 100a using the existing equipment, the optimized design, and the like, and then cutting the solar cell 100a. As a result, facility burden and process cost burden are minimized. On the other hand, if the size of the parent solar cell 100a is reduced, there is a burden of replacing the used equipment or changing the setting.

In this embodiment, the cutting lines CL1 and CL2 include a first cutting line CL1 and a second cutting line CL2, which are located so as to intersect with each other. Then, a plurality of unit solar cells 100 partitioned by the first and second cutting lines CL1 and CL2 may be located in plural in the first direction and plural in the second direction intersecting with each other. According to this, a larger number of unit solar cells 100 can be manufactured even if the cutting process is performed the same number of times as compared with the case where a plurality of cutting lines are parallel to each other. That is, in the case where two cutting lines parallel to each other are provided, the two cutting processes are performed to obtain three unit solar cells from one parent solar cell, whereas the first and second intersecting solar cells When the cutting lines CL1 and CL2 are provided, four unit solar cells 100 can be obtained from one parent solar cell 100a by performing two cutting processes. Thus, the manufacturing process of the unit solar cell 100 or the solar cell panel 200 using the same can be simplified and manufacturing cost can be reduced.

At this time, the unit solar cell 100 can be manufactured stably with only the first cutting line CL1 and the second cutting line CL2. In the case where a plurality of first cutting lines CL1 and / or second cutting lines CL2 are provided that further include other cutting lines or intersect with each other, the impact applied to the parent solar cell 100a in the cutting step may be large have.

For example, the first cutting line CL1 and the second cutting line CL2 may be positioned so as to be orthogonal to each other while passing through the center of the parent solar cell 100a. At this time, the first cutting line CL1 is positioned so as to be parallel to the extending direction (second direction) of the bus bar electrode 42b or the one edge of the unit solar cell 100, and the second cutting line CL2 is located at the finger electrode (The first direction) of the unit solar cell 100 or the other edge of the unit solar cell 100. [ Then, the unit solar cells 100 can be formed in the same shape and area. This will be described in more detail.

More specifically, in this embodiment, the solar cell 100a is fabricated from an ingot of a roughly circular shape of the semiconductor substrate 10 and has two axes (perpendicular to each other), such as a circle, a square, (For example, an axis parallel to the finger electrode 42a and an axis parallel to the bus bar electrode 42b orthogonal thereto) are the same or substantially the same. For example, in this embodiment, the semiconductor substrate 10 of the parent solar cell 100a may have an octagonal shape having an oblique side 10a at four corner portions in an approximate square shape. With such a shape, the semiconductor substrate 10 having the widest area from the same ingot can be obtained. However, the present invention is not limited to this, and it is also possible that the semiconductor substrate 10 or the parent solar cell 100a has a square shape and does not have the inclined side 10a.

Thus, the parent solar cell 100a has a symmetrical shape and has the same distance between the maximum horizontal axis (the horizontal axis passing through the center of the semiconductor substrate 10) and the maximum vertical axis (the vertical axis passing through the center of the semiconductor substrate 10).

At this time, since the first cutting line CL1 and the second cutting line CL2 are positioned so as to be orthogonal to each other as they pass through the center of the parent solar cell 100a, each of the unit solar cells 100 has one inclined side 10a And each unit solar cell 100 can have the same area and shape. However, the present invention is not limited thereto, and it is also possible to not include the inclined side 10a.

The side surface of each unit solar cell 100 or the semiconductor substrate 10 has a first cut surface CS1 along the first cut line CL1, a second cut surface CS2 along the second cut line CL2, A first non-cut surface NCS1 parallel to the cut surface CS1, and a second non-cut surface NCS2 parallel to the second cut surface CS2. (For example, orthogonally) with the first and second cut surfaces CS1 and CS2 connected to each other. At this time, the first length L1 of the first cut surface CS1 along the first direction may be substantially the same as the second length L2 of the second cut surface CS2 along the second direction. Substantially the same may mean having slight differences (for example, within 10%, for example, within 5%) in consideration of process errors and the like. Each unit solar cell 100 is separated from the first and second cut surfaces CS1 and CS2 and connected to the first and second non-cut surfaces NCS1 and NCS2, and at least one of them (e.g., each of them) And a third non-cut surface NCS3 positioned at an oblique position. The third non-cut surface NCS3 is a surface along the third inclined side 10a.

As described above, the side surfaces of each unit solar cell 100 or the semiconductor substrate 10 are composed of the same cut surfaces CS1 and CS2 and non-cut surfaces NCS1, NCS2 and NCS3, and the first and second lengths L1 and L2 The four unit solar cells 100 manufactured from one parent solar cell 100a have the same shape and the same area. Thus, the amount of current measured from each unit solar cell 100 is substantially the same (for example, the error range is within 10%). Thus, the appearance and stability of the solar cell panel 200 can be improved. In particular, even when the parent solar cell 100a has an octagonal shape with the inclined side 10a, this effect can be realized.

On the other hand, unlike the present embodiment, when a plurality of parallel cutting lines are provided, the shape and area of the unit solar cell where the inclined side 10a is located and the unit solar cell where the inclined side 10a is not located are different from each other. Accordingly, the appearance of the manufactured solar cell panel may be poor and the stability may be deteriorated.

The presence or absence of the insulating films 22, 24, and 32 located on the side surfaces and the presence or absence of the insulating films 22, 24, and 32 in the laminated structure of the insulating films 22, 24, The presence and position of the inclined side 10a, the difference in surface roughness on the microscope, the difference in surface morphology, and the like.

For example, the non-cut surfaces NCS1, NCS2, and NCS3 include insulating films 22, 24, and 32 extending from the front and / or rear surface of the semiconductor substrate 10, The insulating films 22, 24, and 32 extending from the front and / Although a separate insulating film is not shown on the cut surfaces CS1 and CS2 of the semiconductor substrate 10 in the drawing, a thermal oxide film (not shown) may be formed on the cut surfaces CS1 and CS2 in a cutting process using heat or the like . Even when the thermal oxide film is located on the cut surfaces CS1 and CS2 as described above, the stacked structure is different from that of the insulating films 22, 24, and 32, or at least one of the insulating films 22, 24, and 32 is different from the material of the thermal oxide film ≪ / RTI > In the case where one inclined side 10a is provided, it can be seen that the unit solar cell 100 is manufactured by cutting. Two side surfaces including the inclined side 10a are connected to the non-cut surfaces NCS1, NCS2, NCS3 And the two side surfaces that are not connected to the inclined side 10a constitute the cut surfaces CS1 and CS2. Also, cutting marks on the cut surfaces CS1 and CS2 may remain in the cutting process. For example, when the cutting process is performed by a laser machining process, a laser mark or a laser-induced melting mark may remain. When a laser cutting process and a mechanical cutting process for applying a physical impact are used together, And the portions cut by the mechanical cutting process may have different angles or may have different morphologies. (CS1, CS2) and non-cut surfaces (NCS1, NCS2, NCS3) by various other methods.

In each unit solar cell 100, the first electrode 42 may include a plurality of first finger electrodes 42a spaced apart from each other with a predetermined pitch. In the drawing, the first finger electrodes 42a extend in the first direction (left and right directions in FIG. 2) and are parallel to each other and parallel to the edge of the semiconductor substrate 10.

The first electrode 42 may include at least one connection electrode formed in a direction crossing the first direction. When the plurality of first finger electrodes 42a are electrically connected to each other by the connection electrodes, neighboring unit solar cells 100 can be connected in a first direction or in a direction crossing the first direction. Accordingly, the arrangement, the connection structure, and the like of the unit solar cell 100 can be freely changed in the solar cell panel 200. The arrangement, connection structure, etc. of the various unit solar cells 100 in the solar cell panel 200 will be described later in detail with reference to FIG. 10 to FIG.

A first bus bar electrode 42b extending in a second direction (a vertical direction in FIG. 2) that crosses (for example, orthogonally intersects) the first direction while connecting the ends of the first finger electrodes 42a is formed in this embodiment Can be located. The first bus bar electrode 42b is positioned at a portion overlapping another unit solar cell 100, and a connecting member (reference numeral 207 in FIG. 8, hereinafter the same) for connecting neighboring unit solar cells 100 is directly It is the part that will be located. At this time, the width of the first bus bar electrode 42b may be larger than the width of the first finger electrode 42a, but the present invention is not limited thereto. Therefore, the width of the first bus bar electrode 42b may be equal to or less than the width of the first finger electrode 42a.

Here, the first bus bar electrode 42b may constitute at least a part of the connection electrode. That is, the first bus bar electrode 42b connects all the first finger electrodes 42a to form a connection electrode in a portion not having the inclined side 10a. The first bus bar electrode 42b connects the first finger electrode 42a which is not positioned on the side of the inclined side 10a and the first finger electrode 42b which is located on the side of the inclined side 10a, The electrode 42a may be connected by the first rim electrode 42c. The rim electrode 42d may have the same material and the same thickness as the first finger electrode 42a or the second bus bar electrode 42b. In this case, the first bus bar electrode 42b and the first rim electrode 42c together form a connection electrode.

The first electrode 42 may further include a first pad electrode 42d parallel to the first finger electrode 42a and positioned closest to the edge of the semiconductor substrate 10. The width of the first pad electrode 42d may be larger than the width of the first finger electrode 42a. When the unit solar cells 100 adjacent to each other in the second direction are electrically connected to each other, the connecting member 207 may be positioned on the first pad electrode 42d. Then, the first pad electrode 42d and the connecting member 207 are attached with a sufficient area, so that the electrical characteristics and adhesion characteristics can be improved.

The first finger electrode 42a, the first bus bar electrode 42b, the first rim electrode 42c and the first pad electrode 42d of the first electrode 42 are all formed of a first insulating film It may be formed through the first passivation film 22 and the antireflection film 24. That is, the first opening 102 is formed in both the first finger electrode 42a, the first bus bar electrode 42b, the first rim electrode 42c, and the first pad electrode 42d of the first electrode 42 May be formed correspondingly. However, the present invention is not limited thereto. As another example, the finger electrode 42a of the first electrode 42 is formed through the first passivation film 22 and the antireflection film 24, and the first bus bar electrode 42b, the first edge electrode 42c And the first pad electrode 42d may be formed on the first passivation film 22 and the antireflection film 24. [ In this case, the first opening 102 is formed in a shape corresponding to the electrode portion including the finger electrode 42a and passing through the first passivation film 22 and the antireflection film 24, and the first bus bar electrode 42b, the first rim electrode 42c, and the first pad electrode 42d.

The second electrode 44 corresponds to the first finger electrode 42a, the first bus bar electrode 42b, the first rim electrode 42c and the first pad electrode 42d of the first electrode 42 And may include a second finger electrode 44a, a second bus bar electrode 44b, a second rim electrode 44c, and a second pad electrode 44d. The content of the first electrode 42 may be applied to the second electrode 44 and the content of the first passivation film 22 and the antireflection film 24 associated with the first electrode 42 may be applied to the second electrode 44. [ Can be applied directly to the second passivation film 32 with respect to the second passivation film 44. [ The width and the pitch of the first bus bar electrode 42b, the first rim electrode 42c and the first pad electrode 42d of the first electrode 42 are equal to the width and pitch of the second finger electrode 42b of the second electrode 44, The first bus electrode 44a, the second bus bar electrode 44b, the second rim electrode 44c, and the second pad electrode 44d.

In this embodiment, for example, one bus bar electrode 42b is provided at one end of the first finger electrode 42a and one pad electrode 42d is provided adjacent to one edge of the first bus electrode 42b in the second direction . And one second bus bar electrode 44b is provided at the other end of the first finger electrode 42a and one second pad electrode 44d is provided adjacent to the other end in the second direction. When the unit solar cells 100 are connected to each other, the first bus bar electrode 42b or the first pad electrode 42d located on one side of one unit solar cell 100, Since the second bus bar electrode 44b or the second pad electrode 44d located on the other side of the solar cell 100 are adjacent to each other and are connected to each other by the connecting member 207, Stable connection is possible. The first and second bus bar electrodes 42b and 44b and the first and second pad electrodes 42d and 44d are formed only on one side to reduce the material cost of the first and second electrodes 42 and 44, The process can be simplified.

The first and second bus bar electrodes 42b and 44b or the first and second pad electrodes 42d and 44d in the unit solar cell 100 located on one side (upper side in the drawing) in the second direction, The position of the first and second bus bar electrodes 42b and 44b or the positions of the first and second pad electrodes 42d and 44d in the unit solar cell 100 located on the other side (lower side of the drawing) Can be reversed. For example, in FIG. 1, the positions of the first and second bus bar electrodes 42b and 44b are reversed. In this case, when the unit solar cells 100 are connected in series to form the solar cell panel 200, the four unit solar cells 100 of the parent solar cell 100a can be connected after the cut. Thus, the manufacturing process of the solar cell panel 200 can be simplified. This will be described in more detail later. However, the present invention is not limited thereto.

At this time, the unit solar cell 100 including the first and second bus bar electrodes 42b and 44b and the first and second pad electrodes 42d and 44d is freely connected in any one of the first and second directions . However, the present invention is not limited thereto. Accordingly, the first and second bus bar electrodes 42b and 44b may include only the first and second pad electrodes 42d and 44d, and the first and second bus bar electrodes 42b and 44b may not include the first and second pad electrodes 42d and 44d. But may include only the second pad electrodes 42d and 44d and may not include the first and second bus bar electrodes 42b and 44b. The first and second bus bar electrodes 42d and 44d, the first and second rim electrodes 42c and 44c, and the first and second pad electrodes 42d and 44d are not essential components. Various modifications related to this will be described in detail later with reference to FIG. 4 to FIG. In addition, unlike the above, it is also possible that the first electrode 42 and the second electrode 44 have different planar shapes or have no similarity, and various other modifications are possible.

As described above, in the present embodiment, the first and second electrodes 42 and 44 of the unit solar cell 100 have a certain pattern, and the unit solar cell 100 is optically coupled to the front and rear surfaces of the semiconductor substrate 10. [ And has a bi-facial structure capable of being incident. Thus, the amount of light used in the unit solar cell 100 can be increased to contribute to the improvement of the efficiency of the unit solar cell 100. However, the present invention is not limited thereto, and it is also possible that the second electrode 44 is formed entirely on the rear side of the semiconductor substrate 10. A parent solar cell 100a or a unit solar cell 100 having various other structures can be applied.

According to the present embodiment, a plurality of unit solar cells 100 manufactured from one parent solar cell 100a have first and second lengths L1 and L2 that are substantially the same, have the same shape, and have the same area The amount of current is substantially the same. Thus, the appearance and stability of the solar cell panel 200 can be improved. In addition, the arrangement, the connection structure, and the like of the unit solar cell 100 can be freely changed in the solar cell panel 200. In addition, in the solar cell panel 200, the area of the overlapped portion OP where the unit solar cells 100 are overlapped with each other can be reduced to reduce a dead area in which photoelectric conversion does not occur, The area of the connecting member 207 for connection, the first and second bus bar electrodes 42b and 44b, and the like can be reduced. The solar cell panel 200 will be described later in more detail. Accordingly, the manufacturing cost of the solar cell panel 200 can be reduced and the output can be improved.

Hereinafter, a parent solar cell including a unit solar cell according to another embodiment of the present invention will be described in detail with reference to FIGS. Since the above description can be applied to the same or extremely similar parts as the above description, the detailed description will be omitted and only the different parts will be described in detail. It is also within the scope of the present invention to combine the above-described embodiments or variations thereof with the following embodiments or modifications thereof. In the following drawings, the first electrode 42 is shown and described as an example, but any of the following embodiments or modifications thereof may be applied to at least one of the first electrode 42 and the second electrode 44. [

4 is a front plan view showing four unit solar cells formed by cutting a parent solar cell according to another embodiment of the present invention.

4, the first bus bar electrodes 42b are positioned at both ends of the first finger electrodes 42a, and the first pad electrodes 42d are positioned at the opposite sides of the first direction in the second direction Located. The connection structure of the neighboring solar cell 100 can be made more freely.

In FIG. 4, the first bus bar electrode 42b and the first pad electrode 42d are located on both sides, but the present invention is not limited thereto. As another example, it is also possible that the first bus bar electrode 42b is provided on both sides and the first pad electrode 42d is provided with or without one. As another example, it is also possible that the first pad electrode 42d is provided on both sides and the first bus bar electrode 42b is provided or not.

5 is a front plan view showing four unit solar cells formed by cutting a parent solar cell according to another embodiment of the present invention.

Referring to FIG. 5, the first bus bar electrode 42b is provided in the present embodiment, and the first pad electrode 42d is not provided. The connecting member 207 may be positioned to extend along the second direction corresponding to the first bus bar electrode 42a to connect the neighboring unit solar cells 100 in the first direction. Alternatively, the connecting member 207 may be positioned to extend along the first direction to electrically connect (e.g., contact) the first finger electrode 42a to the edge of the unit solar cell 100 in the second direction, In the second direction. In FIG. 5, the first bus bar electrode 42b is provided and the first pad electrode 42d is not provided. However, the present invention is not limited thereto. As another example, it is also possible that the first pad electrode 42d is provided and the first bus bar electrode 42b is not provided.

6 is a front plan view showing four unit solar cells formed by cutting a parent solar cell according to another embodiment of the present invention.

Referring to FIG. 6, in this embodiment, only the first finger electrode 42a is provided, and the first bus bar electrode 42b and the first pad electrode 42d are not provided. According to this, the connecting member 207 is positioned to extend along the second direction while being electrically connected (for example, in contact with) the ends of the plurality of first finger electrodes 42a at the edge along the first direction, The battery 100 may be connected in the first direction.

7 is a front plan view showing four unit solar cells formed by cutting a parent solar cell according to another embodiment of the present invention.

7, in this embodiment, the first electrode 42 includes a plurality of first finger electrodes 42a extending in a first direction and a first connection portion 42e connecting the first finger electrodes 42a ). The first connection portion 42e may form at least a part of the connection electrode connecting the first finger electrode 42a.

The first connection portion 42e may have substantially the same width or a smaller width than the first finger electrode 42a. Thus, the shading loss due to the first connection portion 42e can be minimized. However, the present invention is not limited thereto, and the first connection portion 42e may have a larger width than the first finger electrode 42a.

In the drawing, the first connection portion 42e exemplifies that the end portion of the first finger electrode 42a is elongated in a second direction (for example, a direction orthogonal to the first finger electrode 42a) at other portions. However, the present invention is not limited thereto, and the first connection part 42e may have a variety of structures and may connect a plurality of the first finger electrodes 42a. In the drawing, a plurality of first connection portions 42e are provided to illustrate that the first electrode 42 has a grid, a mesh, or a matrix. Accordingly, even if the first finger electrode 42a is disconnected, the first finger electrode 42a can be stably connected. However, the present invention is not limited thereto and only one first connection part 42e may be provided. Although the first rim electrode 42c is not illustrated in the drawing, the first rim electrode 42c may be further included.

The connection member 207 is positioned to extend along the second direction while being electrically connected (e.g., in contact with) the first finger electrode 42a and / or the first connection portion 42e at the edge along the first direction, The one unit solar cell 100 can be connected in the first direction. Alternatively, the connection member 207 may be positioned so as to extend along the first direction while being electrically connected (for example, in contact with) the first finger electrode 42a and / or the first connection portion 42e at the edge along the second direction So that the adjacent unit solar cells 100 can be connected in the second direction.

A solar cell panel 200 including the above-described unit solar cell 100 will be described in detail with reference to FIGS. 8 to 13. FIG. 8 is a schematic cross-sectional view of a solar cell panel 200 including the unit solar cell 100 shown in Figs.

Referring to FIG. 8, a solar cell panel 200 according to an embodiment of the present invention includes a unit solar cell 100, a first substrate (hereinafter, referred to as a "front substrate") positioned on the front surface of the unit solar cell 100, (Hereinafter referred to as "rear sheet") 203 positioned on the rear surface of the unit solar cell 100. [ The solar cell panel 200 further includes a first sealing material 205a between the unit solar cell 100 and the front substrate 201 and a second sealing material 205b between the unit solar cell 100 and the rear sheet 203 (Not shown). This will be explained in more detail.

The two unit solar cells 100 adjacent to each other are electrically connected to each other (for example, in series) by a connecting member 207. More specifically, edge portions of two unit solar cells 100 connected to each other overlap each other to form an overlapping portion OP, and between the two unit solar cells 100 in the overlapping portion OP, (207) are positioned to electrically connect the two unit solar cells (100). The overlapping portion OP and the connecting member 207 may extend in a direction crossing the connecting direction of the two unit solar cells 100 connected to each other. The specific structure will be described later in detail with reference to FIG.

The connection member 270 may be formed of various materials capable of electrically and physically connecting the two unit solar cells 100, and may be formed of a conductive adhesive layer, solder, or the like. These connections are successively repeated so that a plurality of solar cells 100 form one column (or string). The solar cell panel 200 may include one or a plurality of rows of unit solar cells 100. When a plurality of columns are provided, various configurations can be applied to the electrical connection structure.

The first seal member 205a may be located on the light receiving surface of the unit solar cell 100 and the second seal member 205b may be located on the back surface of the unit solar cell 100. The first seal member 205a, (205b) are adhered by lamination to cut off water and oxygen which may adversely affect the unit solar cell (100), and each element of the unit solar cell (100) can be chemically bonded.

The first sealing material 205a and the second sealing material 205b may be ethylene-vinyl acetate copolymer resin (EVA), polyvinyl butyral, silicon resin, ester-based resin, olefin-based resin, or the like. However, the present invention is not limited thereto. Accordingly, the first and second sealing materials 205a and 205b may be formed by a method other than lamination using various other materials.

The front substrate 201 is positioned on the first sealing material 205a to transmit sunlight and may be a glass substrate to protect the unit solar cell 100 from an external impact. The rear sheet 203 protects the unit solar cell 100 from the back surface of the unit solar cell 100, and functions as a waterproof, insulating, and ultraviolet shielding function. The backsheet 203 may be in the form of a film or a sheet. The back sheet 203 may be a TPT (Tedlar / PET / Tedlar) type or a structure in which a fluororesin (for example, polyvinylidene fluoride (PVDF) resin) is formed on at least one surface of a polyethylene terephthalate Lt; / RTI > At this time, the back sheet 203 may be a material having a light-transmitting property or a material having a high reflectance. However, the present invention is not limited thereto, and the front substrate 201 and the rear sheet 203 may be formed of different materials.

9 is a cross-sectional view schematically showing two unit solar cells 100 connected to each other by a connecting member 207 included in the solar cell panel 100 shown in FIG. For the sake of simplicity and clarity, FIG. 9 is based on the unit solar cell 100 shown in FIG.

9, the connecting member 207 is located between the first electrode 42 of the first unit solar cell 101 and the second electrode 44 of the first unit solar cell 102 (for example, Contact them electrically and physically. Although not shown in the drawing, the first electrode 42 of another unit solar cell 100 is located on the connecting member 207 located on the second electrode 44 of the first unit solar cell 101, The unit solar cells 100 can be connected to each other by the connecting member 207. Similarly, although not shown in the drawing, the second electrode 44 of another unit solar cell 100 is located on the connecting member 207 located on the first electrode 42 of the second unit solar cell 102 These two unit solar cells 100 can be connected to each other by the connecting member 207. [ These connections are successively repeated so that a plurality of solar cells 100 form one solar cell string (reference numeral 105 in Fig. 10) or a solar cell group (reference numeral 107 in Fig. 13). This will be described later in more detail with reference to FIG. 10 to FIG.

The connecting member 207 may be composed of various materials capable of electrically and physically connecting the two unit solar cells 100, and may be formed of a conductive adhesive layer, solder, or the like.

In the drawings and the foregoing description, for example, the unit solar battery 100 is electrically connected by positioning the connecting member 207 between the first and second bus bar electrodes 42b and 44b. However, the present invention is not limited thereto, and the unit solar cell 100 may be electrically connected by positioning the connecting member 207 between the first and second pad electrodes 42d and 44d. Alternatively, the connection member 270 may be positioned between the first bus bar electrode 42b and the second pad electrode 44d or between the second bus bar electrode 44b and the first pad electrode 42d to form a unit solar cell 100 may be electrically connected. Alternatively, the connection member 270 may be connected to the first or second finger electrodes 42a and 44a instead of the first and second bus bar electrodes 42b and 44b and / or the second pad electrodes 42d and 44d, The solar cell 100 may be electrically connected. Various other variations are possible.

10 is a schematic plan view of the solar cell panel 200 shown in Fig. 10 shows the first and second bus bar electrodes 42b and 44b used for electrical connection with the semiconductor substrate 10 for the unit solar cell 100 in a simplified and clear view.

10, in this embodiment, two unit solar cells 100 adjacent to each other in the first axial direction (x-axis direction in the figure) are overlapped with each other to form an overlapping portion OP, And the two unit solar cells 100 are electrically connected to each other.

Here, each overlap portion OP and the connecting member 207 may be located at one side of one surface of each unit solar cell 100 in the first axis direction. At this time, in the unit solar cell 100 connected to each other, the connecting member 207 is connected to the first electrode (reference numeral 42 in Fig. 9, hereinafter the same) of one unit solar cell 100 and the other electrode And the second electrode (reference numeral 44 in Fig. 9, hereinafter the same). The connecting member 207 is positioned on the first bus bar electrode 42b located on one side in the first axis direction in each unit solar cell 100 and the connecting member 207 is located on the other side in the first axis direction, The connecting member 207 may be positioned on the electrode 44b. Each of the overlapping portions OP and the connecting member 207 has a shape extending along a second axial direction (y-axis direction in the drawing) intersecting (for example, orthogonal to) the first axial direction. Thereby forming a solar cell string 105 in which a plurality of unit solar cells 100 are positioned to extend along the first axis direction.

The overlapping portion OP may have a width such that the unit solar cell 100 is stably positioned by the connecting member 207. In one example, the width of the overlapping portion OP may be 1 to 10 mm. If the width of the overlapped portion OP is less than 1 mm, the connection of the unit solar battery 100 may not be stably performed. If the overlapping portion OP is larger than 10 mm, the dead area of the solar battery 200, The output may be degraded. However, the present invention is not limited thereto.

A plurality of solar cell strings 105 are positioned so as to be spaced apart from each other in the second axis direction and the solar cell strings 105 positioned close to each other in the second axis direction are connected to bus ribbon 209 located at the distal end, In parallel, or in series and parallel. The bus ribbons 209 may be formed of various materials capable of electrically connecting the unit solar cells 100.

For example, a bus ribbon 209 is connected (eg, in contact with) the first bus bar electrode 42b or the second bus bar electrode 44b of each unit solar cell 100, So that the two solar cell strings 105 can be electrically connected in the second axis direction. At this time, the bus ribbon 209 may extend in a direction intersecting the extension direction of the solar cell string 105 and parallel to the overlapping portion OP.

In the drawing, for example, the bus ribbons 209 alternately connect the solar cell strings 105 at both ends of the solar cell strings 105 in the first axis direction. That is, the bus ribbon 209 connects the solar cell string 105 located in the first row at one side in the first axial direction (the right side of the drawing) with the solar cell string 105 located at the second row, The solar cell string 105 located in the second column and the solar cell string 105 located in the third column are connected to each other and the solar cell string 105 located in the third column and the solar cell string 105 ) Are connected to each other. The unit solar cells 100 can be connected in series by the connecting member 207 and the bus ribbons 209 as a whole. However, the present invention is limited to this.

The overlap portion OP is positioned so as to include the first bus bar electrode 42b and the second bus bar electrode 44b of the two unit solar cells 100 and two unit solar cells The connecting member 207 may be positioned between the first bus bar electrode 42b and the second bus bar electrode 44b of the battery 100. [ However, a connection member (not shown) may be formed on the first and / or second pad electrodes (42d and 44d in Fig. 1, the same applies hereinafter), the first and / or second finger electrodes (42a and 42b in Fig. 207 may be connected.

The two unit solar cells 100 connected by the connecting member 207 in the present embodiment are arranged such that the first or second cut surfaces CS1 and CS2 overlap each other in the overlapping portion OP, The first or second non-cut surface NCS1 or NCS2 or the inclined side 10a may overlap with each other. Accordingly, the first or second cut surface CS1 or CS2 having the same length or the first or second non-cut surface NCS1 or NCS2 can be positioned to improve the esthetics and improve the structural stability. In addition, since the unit solar cell 100 manufactured from the parent solar cell (100a in Fig. 2) can be connected as it is without rotating, the process for rotation can be omitted. For example, as shown in the drawing, four unit solar cells 100 manufactured from one parent solar cell 100a may be arranged without rotation to constitute two rows and two columns. However, the present invention is not limited thereto.

As described above, the unit solar cells 100 included in the solar cell panel 200 have substantially the same length, the same shape, and the same area in the first direction and the second direction, and the current amounts are substantially the same. Thus, the appearance and stability of the solar cell panel 200 can be improved. The dead area can be reduced by reducing the area of the overlapping portion OP and the area of the connecting member 207 and the first and second bus bar electrodes 42b and 44b for connecting the unit solar cell 100 can be reduced have. Accordingly, the manufacturing cost of the solar cell panel 200 can be reduced and the output can be improved.

On the other hand, unlike the present embodiment, in a unit solar cell manufactured by cutting along a plurality of parallel cutting lines, if there is an inclined side, the shape and area of each unit solar cell can be changed, and the amount of current can also be changed. In addition, the unit solar cell has a major axis and a minor axis, and the overlapping portion and the connecting member connecting the two solar cells extend along the major axis, thereby increasing the area of the overlapping portion and the connecting member. As a result, the dead region increases due to the overlapping portion, and the material cost due to the connecting member and the bus bar electrode for the connecting member can be increased.

11 is a schematic plan view of a solar cell panel 200 according to another embodiment of the present invention. 11A and 11B, the first and second bus bar electrodes 42b and 44b and the first and second pad electrodes 42a and 42b used for electrical connection with the semiconductor substrate 10 for the unit solar cell 100 are shown in FIG. 11 for simplicity and clarity. 42d, and 44d. In the following description, the same or similar parts as in the embodiment shown in Fig. 10 will not be described in detail.

11, in this embodiment, the overlapping portion OP is divided into a first overlapping portion OP1 located on one side of each unit solar cell 100 in the first axis direction, (OP2) positioned on one side of the first overlapping portion (100). The connecting members 207 are respectively disposed on the first and second overlapping portions OP1 and OP2 and the unit solar cells 100 overlapping each other can be connected.

More specifically, in the two unit solar cells 100 connected in the first axis direction, each of the first overlapping parts OP1 and the connecting member 207 are arranged on one surface of each unit solar cell 100 in the first axis direction Can be located on one side. At this time, in the unit solar cell 100 connected in the first axis direction, the connecting member 207 is connected to the first electrode 42 of one unit solar cell 100 and the second electrode 42, respectively. The connecting member 207 is positioned on the first electrode 42 located on one side in the first axial direction of the unit solar cell 100 and the second electrode 44 is disposed on the other side in the first axial direction, The connecting member 207 can be positioned on the upper surface of the base plate 201. Each of the first overlapping parts OP1 and 207 has a shape extending along a second axial direction (y-axis direction in the drawing) intersecting (for example, orthogonal to) the first axial direction. Thereby forming a solar cell string 105 in which a plurality of unit solar cells 100 are positioned to extend along the first axis direction.

The unit solar cell 100 (hereinafter referred to as the connecting solar cell 103) located between the two solar cell strings 105 and connecting them is connected by the second overlapping unit OP2 and the connecting member 207 do. The second overlaps OP2 and the connecting members 207 in the connected solar cell 103 may be located on one side of each connecting solar cell 103 in the second axis direction. At this time, in the unit solar cell 100 connected in the second axis direction and the connecting member 207 in the connected solar cell 100, the first electrode 42 and the second electrode 42, respectively. The connecting member 207 is positioned on the first electrode 42 located on one side in the second axial direction of the connected solar cell 100 connecting the solar cell string 105 in the second axial direction, And the connecting member 207 may be positioned on the second electrode 44 on the other side in the second axial direction. Each of the second overlapping portions OP2 and the connecting member 207 has a shape extending along the first axis direction. Thus, the connected solar cell 103 can connect the plurality of solar cell strings 105 in the second axial direction.

More specifically, in a unit solar cell 100 that is not located at the end of the solar cell string 105, the first overlapping portion OP1 extending in the second axial direction on one side in the first axial direction from the first side, 207 and the first overlapping portion OP1 and the connecting member 207 extending in the second axial direction are located on the other side of the first axial direction. In the unit solar cell 100 positioned at the end connecting the two solar cell strings 105 in the second axial direction, the first overlapping portion OP1 and the second overlapping portion OP2 are formed on one side in the first axis direction along the second axis direction, And the second overlapping portion OP2 and the connecting member 207 are located along the first axial direction at one side in the second axial direction on the other surface. In the connecting solar cell 103, the second overlapping portion OP2 and the connecting member 207, which extend in the first axial direction from one side in the second axial direction, are located on one side, and on the other side in the second axial direction, A second overlapping portion OP2 extending in the second axial direction and a connecting member 207 are located.

Thus, in this embodiment, the unit solar cells 100 can be freely connected by applying the first overlaps OP1 and the second overlaps OP2 which intersect with each other. Accordingly, the arrangement, the connection structure, and the like of the unit solar cell 100 can be freely changed in the solar cell panel 200.

Here, in the first overlapping portion OP1, the connecting member 37 may be positioned between the first and second bus bar electrodes 42b and 44b, and in the second overlapping portion OP2, The connecting member 37 may be positioned between the pad electrodes 42d and 44d. As another example, in the first overlapping portion OP1, the connecting member 37 may be positioned between the first and second pad electrodes 42d and 44d, and in the second overlapping portion OP2, And the connecting member 37 may be positioned between the bus bar electrodes 42b and 44b. However, the present invention is not limited thereto. Alternatively, the connecting member 37 may be connected directly to the first and / or second finger electrodes 42a and 44a. The connection member 37 is electrically connected to the electrode portion constituting the first electrode 42 and the second finger electrode 42b such as the first finger electrode 42a, the first bus bar electrode 42d, the first pad electrode 42d, Such as the first bus bar electrode 44a, the second bus bar electrode 44d, and the second pad electrode 44d, may be connected between the electrode portions constituting the second electrode 44. [

In the drawing, for example, the connection solar cell 103 connects two solar cell strings 105 alternately. That is, the connected solar cell 103 connects the solar cell string 105 located in the first column at one side in the first axial direction (the right side of the drawing) with the solar cell string 105 located at the second column, The solar cell string 105 located in the second row and the solar cell string 105 located in the third row are illustrated. The unit solar cells 100 can be connected in series by the connecting member 207 and the bus ribbons 209 as a whole. However, the present invention is limited to this.

In the present embodiment, the connecting solar cells 103 are provided between two solar cell strings 105 which are spaced apart from each other and are connected to each other. However, the present invention is not limited thereto. Another embodiment will be described in detail with reference to Fig.

12 is a schematic plan view of a solar cell panel 200 according to another embodiment of the present invention. 12, the first and second bus bar electrodes 42b and 44b and the first and second pad electrodes 42a and 42b used for electrical connection with the semiconductor substrate 10 are electrically connected to the unit solar cell 100 in a simple and clear view, 42d, and 44d. In the following description, the same or similar parts as those of the embodiment shown in Figs. 10 and 11 will not be described in detail.

Referring to FIG. 12, in this embodiment, the solar cell strings 105 may be positioned to overlap with each other in the second axis direction. That is, the connecting member 207 is positioned on the second overlapping portion OP2 between two unit solar cells 100 positioned at the same end in two solar cell strings 105 adjacent to each other in the second axis direction, And connects the string 105 in the second axial direction. If the solar cell string 105 is overlapped in the second axis direction as well, an empty space is not located between the solar cell strings 105, thereby maximizing the area in which the unit solar cell 100 exists.

More specifically, in a unit solar cell 100 which is not located at an end of the solar cell string 105, the first overlapping portion OP1 extending from one side in the first axis direction to the second axis direction and the connecting member 207 and a first overlapping portion OP1 and a connecting member 207 extending from the other side in the first axis direction in the second axis direction are located on the other side. In the two unit solar cells 100 connecting the two solar cell strings 105 in the second axial direction, the first overlapped portion OP1 and the second overlapping portion OP2 are formed along the second axial direction from one side in the first axial direction, The second overlapping portion OP2 and the connecting member 207 are located along the first axial direction at one side in the second axial direction. As a result, the first overlaps OP1 and the second overlaps OP2 intersecting with each other are positioned together in one unit solar cell 100.

At this time, the insulating layer (IL) is located at a portion where two solar cell strings (105) overlapping in the second axis direction should not be electrically connected to each other, thereby preventing an unwanted electrical connection or short circuit. As the insulating layer IL, various materials having an insulating property can be used. In the drawing, the insulating layer IL is elongated in the first axis direction so as to extend over a plurality of unit solar cells 100 to simplify the structure. However, the present invention is not limited thereto, and various modifications are possible, for example, the insulating layer IL is individually formed in each unit solar cell 100 in the first axis direction. In addition, it is also possible not to form the first and second electrodes 42 and 44 at the respective portions in consideration of the portions that should not be connected to each other in the unit solar cells 100 without separately providing the insulating layer IL . Various other variations are possible.

Thus, in this embodiment, the unit solar cells 100 can be freely connected by applying the first overlaps OP1 and the second overlaps OP2 which intersect with each other. Accordingly, the arrangement, the connection structure, and the like of the unit solar cell 100 can be freely changed in the solar cell panel 200.

Here, in the first overlapping portion OP1, the connecting member 37 may be positioned between the first and second bus bar electrodes 42b and 44b, and in the second overlapping portion OP2, The connecting member 37 may be positioned between the pad electrodes 42d and 44d. As another example, in the first overlapping portion OP1, the connecting member 37 may be positioned between the first and second pad electrodes 42d and 44d, and in the second overlapping portion OP2, And the connecting member 37 may be positioned between the bus bar electrodes 42b and 44b. However, the present invention is not limited thereto. Alternatively, the connecting member 37 may be connected directly to the first and / or second finger electrodes 42a and 44a. The connection member 37 is electrically connected to the electrode portion constituting the first electrode 42 and the second finger electrode 42b such as the first finger electrode 42a, the first bus bar electrode 42d, the first pad electrode 42d, Such as the first bus bar electrode 44a, the second bus bar electrode 44d, and the second pad electrode 44d, may be connected between the electrode portions constituting the second electrode 44. [

13 is a schematic plan view of a solar cell panel 200 according to another embodiment of the present invention. 13 shows the first and second bus bar electrodes 42b and 44b and the first and second pad electrodes 42a and 42b used for electrical connection with the semiconductor substrate 10 for the unit solar cell 100, 42d, and 44d. In the following description, the same or similar parts as those of the embodiment shown in Figs. 10 to 12 will not be described in detail.

Referring to FIG. 13, in this embodiment, a plurality of unit solar cells 100 are formed to form a solar cell group 107 having a plurality of rows and / or a plurality of columns (for example, a plurality of rows and a plurality of columns) And a plurality of solar cell groups 107 can be connected to the same bus ribbon 209. The connecting member 207 is located on the first and second overlapping parts OP1 and OP2 of the unit solar cell 100 to be connected to each other and the insulating layer IL) may be located.

In the solar cell group 107, a plurality of unit solar cells 100 can be connected in series, parallel, or series-parallel by the first overlapping unit OP1, the second overlapping unit OP2, and the connecting member 207 have.

In the drawing, for example, a plurality of unit solar cells 100 forming one solar cell group 107 are connected in series. One of the first and second electrodes 42 and 44 is connected to the bus ribbon 209 by the first lead portion 209a at one end of the solar cell group 107, At least one of the first and second electrodes 42 and 44 may be connected to the bus ribbon 209 by a second lead portion 209b. The bus ribbon 209 may include a wiring or a pattern connected to the first lead portion 209a and a wiring or a pattern connected to the second lead portion 209b. The bus ribbons 209 may have wiring or patterns connecting the plurality of solar cell groups 107 connected to the same bus ribbon 209 in series, parallel or series-parallel. Various materials, structures and the like that can be electrically connected to the bus ribbon 209 and the first and second lead portions 209a and 209b can be applied.

In the drawing, four unit solar cells 100 manufactured in one solar cell 100a are directly used to form a solar cell group 107 having two rows and two columns. However, the row and column of the solar cell group 107 are not limited to a specific number.

Features, structures, effects and the like according to the above-described embodiments are included in at least one embodiment of the present invention, and the present invention is not limited to only one embodiment. Further, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified in other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

100: Unit solar cell
103: Connecting solar cells
105: Solar cell string
107: Solar cell group
200: Solar panel
207:
209: Bus Ribbon
209a: first lead portion
209b: a second lead portion

Claims (20)

A semiconductor substrate;
A conductive type region formed on the semiconductor substrate or on the semiconductor substrate; And
An electrode electrically connected to the conductive type region
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Wherein the side surface of the semiconductor substrate includes a first cut surface and a second cut surface which intersect each other, a first non cut surface parallel to the first cut surface, and a second non cut surface parallel to the second cut surface. The method according to claim 1,
Wherein the semiconductor substrate has a first length of the first section along the first direction and a second length of the second section along the second direction intersecting the first direction. The method according to claim 1,
Wherein the first cut surface and the second cut surface are perpendicular to each other. The method according to claim 1,
And a second non-cut surface that is separated from the first cut surface and the second cut surface and is connected to the first non-cut surface and the second non cut surface, wherein at least one of the first cut surface, the second cut surface, And a third non-cut surface located at an oblique position. The method according to claim 1,
Wherein at least one of the first electrode and the second electrode includes a plurality of finger electrodes and at least one connection electrode that connects the plurality of finger electrodes and crosses the plurality of finger electrodes. 6. The method of claim 5,
And a bus bar electrode connecting the end portions of the plurality of finger electrodes while the connection electrode is formed in a direction crossing the plurality of finger electrodes. The method according to claim 1,
Wherein the first electrode includes a plurality of first finger electrodes and a first bus bar electrode formed to intersect the first finger electrodes and one end of the plurality of first finger electrodes,
And the second electrode includes a plurality of second finger electrodes and a second bus bar electrode formed so as to intersect with the other ends of the plurality of second finger electrodes. 6. The method of claim 5,
Wherein at least one of the first electrode and the second electrode has a mesh shape. The solar cell according to claim 1, wherein the connection electrode is formed in a direction crossing the plurality of finger electrodes. 6. The method of claim 5,
Wherein at least one of the first electrode and the second electrode further comprises a pad electrode formed parallel to the plurality of finger electrodes and adjacent to an edge of the semiconductor substrate and having a width greater than that of the plurality of finger electrodes Solar cells. 1. A solar cell comprising a plurality of unit solar cell regions divided along first and second cutting lines intersecting each other,
Wherein the plurality of unit solar cell regions are located in plural in the first direction and in plural in the second direction intersecting the first direction,
The first cut line is formed parallel to one edge of the solar cell, the second cut line is formed parallel to the other edge of the solar cell,
Wherein the plurality of unit solar cell regions have the same shape and area. A plurality of solar cells including a first solar cell and a second solar cell electrically connected to each other; And
Wherein each of the first and second solar cells comprises: a semiconductor substrate; A conductive type region formed on the semiconductor substrate or on the semiconductor substrate; And an electrode electrically connected to the conductive region,
Wherein the side surfaces of the first and second solar cells have a first and a second cut surface intersecting with each other, a first non cut surface parallel to the first cut surface, and a second non cut surface parallel to the second cut surface, Battery panel. 12. The method of claim 11,
The semiconductor substrate has a first length of the first section along the first direction and a second length of the second section along the second direction intersecting the first direction. 12. The method of claim 11,
Wherein the plurality of solar cells have the same shape and the same area. 12. The method of claim 11,
Wherein the first solar cell and the second solar cell are overlapped with each other,
Wherein a connecting member is located in the overlapping portion to electrically connect the first electrode of the first solar cell and the second electrode of the second solar cell. 15. The method of claim 14,
Wherein the overlapping portion extends in a direction crossing the extension direction of the first solar cell and the second solar cell. 15. The method of claim 14,
Wherein the plurality of solar cells further include a third solar cell connected to the first or second solar cell,
Wherein the third solar cell has a bus ribbon having another overlapping portion formed in a direction intersecting the overlap portion or extending in a direction parallel to the overlap portion. 15. The method of claim 14,
And the width of the overlapping portion is 1 to 10 mm. 15. The method of claim 14,
Wherein the first and second solar cells are located such that one of the first and second cut surfaces is overlapped with each other in the overlap portion, or one of the first and second non-cut surfaces is positioned to overlap with each other. 15. The method of claim 14,
Wherein at least one of the first electrode and the second electrode includes a plurality of finger electrodes,
A bus bar electrode formed in a direction intersecting with the plurality of finger electrodes and connecting ends of the plurality of finger electrodes and a bus bar electrode formed in parallel with the plurality of finger electrodes and being closest to an edge of the semiconductor substrate, And at least one of the pad electrodes having a greater width,
And the connection electrode is connected to the bus bar electrode or the pad electrode. 15. The method of claim 14,
Wherein at least a part of the plurality of solar cells constitutes a solar cell string extending along one direction or constitutes a solar cell group having a plurality of rows or columns.

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