KR20180136703A - Crystalline solar cell - Google Patents

Abstract

According to the present invention, a finger line electrode is densely disposed on the outer edge of a solar cell having great surface resistance of a substrate. Thus, collection efficiency of electrons and holes is increased and the efficiency of the solar cell can be increased. Also, the efficiency of the solar cell can be increased by activating the current flow of the solar cell to increase fill factors. To this end, a crystalline solar cell of the present invention comprises: a first electrode formed on a substrate; a photoelectric conversion layer formed on the first electrode; a second electrode formed on the photoelectric conversion layer; a plurality of finger line electrodes connected to the second electrode; and a plurality of bus bar electrodes connected to the second electrode and vertically and crossly connected to the finger line electrodes to collect electrons or holes collected from the finger line electrodes. The width between the finger line electrodes at the outer edge of the substrate may be smaller than the width between the finger line electrodes at the center of the substrate.

Description

Crystalline solar cell [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crystalline solar cell, and more particularly, to a crystalline solar cell capable of improving the efficiency of a solar cell by facilitating current collection of the solar cell.

Solar cells are devices that convert light energy into electrical energy using the properties of semiconductors.

The solar cell has a PN junction structure in which a P (positive) semiconductor layer and an N (negative) semiconductor layer are bonded to each other. When sunlight enters the solar cell having such a structure, Holes and electrons are generated in the semiconductor. At this time, the holes (+) move toward the P-type semiconductor due to the electric field generated at the PN junction, and the electrons (-) move toward the N-type semiconductor So that electric potential can be generated.

Such a solar cell generally can be classified into a substrate type solar cell and a thin film type solar cell.

The substrate type solar cell is a solar cell manufactured by using a semiconductor substrate such as silicon as a semiconductor layer. The solar cell has advantages of high manufacturing cost and high photoelectric conversion efficiency. The thin film type solar cell is a solar cell manufactured by forming a semiconductor layer in the form of a thin film on a substrate such as glass, and has advantages of low photoelectric conversion efficiency and low manufacturing cost.

The above-described substrate type solar cell is manufactured through a texturing process for etching a semiconductor substrate, a semiconductor layer forming process, and an electrode forming process. In each manufacturing process of such a substrate type solar cell, a substrate tray capable of stacking several tens of semiconductor substrates is used. For example, a substrate processing apparatus for performing a thin film deposition process (for example, a plasma deposition process), which is one of processes for manufacturing a substrate-type solar cell, includes a step of forming a predetermined thin film material Are simultaneously deposited.

1 is a view schematically showing a general solar cell.

1, a general solar cell includes a finger electrode 3 and a bus bar electrode 2 disposed on a substrate 1 to form a photon formed of solar light in the finger line electrode 3. The finger electrode 3, Are separated into electrons and holes and are collected into the finger line electrode (3) and the bus bar electrode (2).

In such a conventional solar cell, the finger line electrode 3 and the bus bar electrode 2 are disposed at equal intervals, and the collecting efficiency of electrons and holes may be lowered, thereby reducing the efficiency of the solar cell there was. More specifically, when the surface resistance on the substrate 1 is large, the current flow of the solar cell is not smooth due to the high resistance difference, and the efficiency due to the reduction of the fill factor (FF) may decrease.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a crystalline solar cell capable of improving the collecting efficiency of electrons and holes by densely arranging finger line electrodes in a region where a surface resistance of a substrate is large .

According to an aspect of the present invention, there is provided a crystalline solar cell comprising: a first electrode formed on a substrate; A photoelectric conversion layer formed on the first electrode; A second electrode formed on the photoelectric conversion layer; A plurality of finger line electrodes connected to the second electrode; And a plurality of bus bar electrodes connected to the second electrode and crossing vertically with the finger line electrodes to collect electrons or holes collected from the finger line electrodes, And a width between the line electrodes may be smaller than a width between the plurality of finger line electrodes at the center of the substrate.

In addition, the width between the plurality of finger-line electrodes gradually decreases from the outer edge of the substrate to the center of the substrate, and gradually decreases from the central portion of the substrate to the outer- The width may include a gradual increase and the first finger line electrode disposed at the outermost portion of the substrate may be disposed between 0.5 mm and 2.5 mm from one end of the upper surface of the substrate.

In addition, the width of the finger line electrode may include a largest one of the outermost portions of the substrate, and the plurality of finger line electrodes may be disposed symmetrically.

The area of the plurality of finger line electrodes and the plurality of bus bar electrodes may be 1% or more and 5% or less of the area of the substrate.

The present invention also provides a liquid crystal display comprising: a first electrode formed on a substrate; A photoelectric conversion layer formed on the first electrode; A second electrode formed on the photoelectric conversion layer; A plurality of finger line electrodes connected to the second electrode; And a plurality of bus bar electrodes connected to the second electrode and crossing vertically with the finger line electrodes to collect electrons or holes collected from the finger line electrodes, A width between the line electrodes is a first width, a width between the plurality of finger line electrodes at a center portion of the substrate is a second width, and the first width is smaller than the second width.

The present invention also provides a liquid crystal display comprising: a first electrode formed on a substrate; A photoelectric conversion layer formed on the first electrode; A second electrode formed on the photoelectric conversion layer; A plurality of finger line electrodes connected to the second electrode; And a plurality of bus bar electrodes connected to the second electrode and vertically crossing the finger line electrodes to collect electrons or holes collected from the finger line electrodes, wherein the plurality of finger lines The width between the electrodes may be determined depending on the magnitude of the surface resistance of the solar cell.

The surface resistance of the solar cell may include an outer portion of the solar cell larger than a central portion of the solar cell, and a width between the plurality of finger- And a width between the plurality of finger-line electrodes in the first electrode.

 The width of the first finger line electrode in the first finger line electrode disposed at the outermost portion of the solar cell and the second finger line electrode closest to the first finger line electrode among the plurality of finger line electrodes may be a width The width of the finger line electrodes may be the same as the width of the finger line electrodes other than the finger line electrodes disposed at the outermost portion of the solar cell.

According to the present invention as described above, the following effects can be obtained.

The finger line electrodes are densely arranged on the outer surface of the solar cell having a large surface resistance of the substrate to improve the efficiency of collecting electrons and holes to improve the efficiency of the solar cell and smooth the current flow of the solar cell, the efficiency of the solar cell can be improved by increasing the fill factor.

1 is a view schematically showing a general solar cell.
2 is a perspective view schematically showing a solar cell according to an embodiment of the present invention.
3 is a plan view schematically showing a solar cell according to an embodiment of the present invention.
4 is a plan view schematically showing a solar cell according to another embodiment of the present invention.
5 is a plan view schematically showing a solar cell according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. In the case where the word 'includes', 'having', 'done', etc. are used in this specification, other parts can be added unless '~ only' is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the case of a description of a temporal relationship, for example, if the temporal relationship is described by 'after', 'after', 'after', 'before', etc., May not be continuous unless they are not used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

2 is a perspective view schematically showing a solar cell according to an embodiment of the present invention.

Referring to FIG. 2, a crystalline solar cell according to an embodiment of the present invention includes a first electrode 20 formed on a substrate 10; A photoelectric conversion layer (30) formed on the first electrode (20); A second electrode (50) formed on the photoelectric conversion layer (30); A plurality of finger line electrodes (100) connected to the second electrode (50); And a plurality of bus bar electrodes 200 connected to the second electrode 50 and perpendicularly crossing the finger line electrodes 100 to collect electrons or holes collected from the finger line electrodes 100 And the width between the plurality of finger line electrodes 100 at the outer frame portion of the substrate 10 may be smaller than the width between the plurality of finger line electrodes 100 at the central portion of the substrate 10. [ have.

The substrate 10 may be a glass substrate, a metal substrate, a plastic substrate, or a flexible substrate. When a glass substrate is used as the substrate 10, production terminals of the solar cell can be reduced. On the other hand, when a metal substrate, a plastic substrate, or a flexible substrate is used as the substrate 10, the solar cell can be made thinner and lighter, and a flexible solar cell can be manufactured. For example, the metal substrate may be made of aluminum or stainless steel, and the flexible substrate may be made of a thin (50 to 200 탆 thick) glass, a metal foil, and a plastic material. The plastic material is a thermoplastic semicrystalline polymer material such as PC (Polycarbonate), PET (Polyethylene terephthalate), PES (Polyethersulfone), PI (Polyimide), PEN (Polyethylene Naphthalate), PEEK (Polyetheretherketone) Lt; / RTI >

The first electrode 20 is formed on the front surface of the substrate 10 and serves as a positive electrode through which holes generated by the photoelectric conversion layer 30 move. At this time, the first electrode 20 may be formed of Ag, Al, Ag + Al, Ag + Mg, Ag + Mn, Ag + Sb, Ag + Zn, Ag + Mo, Ag + Ni, Ag + + Zn and the like or a transparent conductive material such as ITO (Indium Tin Oxide), FTO (Fluorine doped Tin Oxide), ZnO, ZnO: B, ZnO: Al, ZnO: Oxide).

The first electrode 20 may be formed of a transparent conductive material such as ZnO, ZnO: B, ZnO: Al, ZnO: H, or the like on the entire surface of the substrate 10 by MOCVD (Metal Organic Chemical Vapor Deposition) desirable. At this time, the first electrode 20 may be formed to have a thickness of about 1 탆.

Since the first electrode 20 is a surface on which sunlight is incident, the first electrode 20 may be formed to have a concave-convex structure through a texturing process in order to allow the incident sunlight to be absorbed into the solar cell as much as possible. have. The texture processing process is a process of forming the surface of the material into a rugged concave-convex structure so as to be processed into the same shape as the surface of the fabric. The process includes an etching process using photolithography, an anisotropic etching process using a chemical solution, Or a groove forming process using mechanical scribing or the like.

The photoelectric conversion layer 30 is formed of a semiconductor material on the entire surface of the first electrode 20 to generate a predetermined electric power through a drift of holes and electrons generated by the sunlight. Here, the photoelectric conversion layer 30 may be formed of a silicon-based semiconductor material.

The photoelectric conversion layer 30 may be formed of a semiconductor layer of a PIN structure in which a P-type semiconductor material layer, an I-type semiconductor material layer, and an N-type semiconductor material layer are sequentially stacked.

The N-type semiconductor material layer means a semiconductor doped with an N-type doping material (for example, a Group 5 element material such as antimony (Sb), arsenic (As) And the P-type semiconductor material layer means a semiconductor doped with a P-type doping material (for example, a Group III element material such as boron (B), gallium (Ga), or indium (In)). Here, instead of the I-type semiconductor material layer, the N-type or P-type semiconductor material layer having a thickness thinner than the N-type or P-type semiconductor material layer may be formed, An N-type or P-type semiconductor material layer having a lower doping concentration than the P-type semiconductor material layer can be formed.

When the photoelectric conversion layer 30 is formed of a semiconductor layer having a PIN structure, the I-type semiconductor material layer is depleted by the P-type semiconductor material layer and the N-type semiconductor material layer, And holes and electrons generated by the sunlight are drifted by the electric field to be collected in the p-type semiconductor material layer and the n-type semiconductor material layer, respectively.

When the photoelectric conversion layer 30 is formed of a semiconductor layer having a PIN structure, the P-type semiconductor material layer is formed on the first electrode 20, and the I-type semiconductor material layer and the I- It is preferable to form an N-type semiconductor material layer because the drift mobility of holes is low due to the drift mobility of electrons. Therefore, in order to maximize collection efficiency by incident light, the P- Layer to be close to the light receiving surface.

In addition, the photoelectric conversion layer 30 may have a tandem structure. The photoelectric conversion layer 30 may be formed of an amorphous semiconductor material having a PIN structure or a microcrystalline semiconductor material having a PIN structure. Since the amorphous semiconductor material absorbs light having a short wavelength and the microcrystalline semiconductor material has a property to absorb light having a long wavelength, the light absorption efficiency can be enhanced when the amorphous semiconductor material and the microcrystalline semiconductor material are combined have.

In addition, the photoelectric conversion layer may be formed to have a triple structure.

The transparent conductive layer 40 may be formed of the same transparent conductive material as the first electrode 20 and may be formed of a transparent conductive material such as ZnO, ZnO: B, ZnO: Al, ZnO: . At this time, the transparent conductive layer 40 may have a thickness of about 100 nm. The transparent conductive layer 40 scatters the sunlight transmitted through the photoelectric conversion layer 30 and advances the photoelectric conversion layer 30 at various angles. The transparent conductive layer 40 reflects from the second electrode 50 to the photoelectric conversion layer 30 The efficiency of the solar cell is improved by increasing the proportion of the light that is reentered. The above-mentioned transparent conductive layer 40 may be omitted.

The second electrode 50 is formed on the front surface of the photoelectric conversion layer 30. The second electrode 50 may be formed by a printing process using a metal material such as Ag, Al, Ag + Mo, Ag + Ni, or Ag + Cu. At this time, the printing process may be performed by various methods such as screen printing, inkjet printing, gravure printing, gravure offset printing, reverse printing, flexo printing, Or a micro contact printing method. Here, the screen printing method is a method of transferring ink through the mesh of the screen by moving the squeegee while pressing the squeegee at a predetermined pressure by raising the ink on the screen. The ink jet printing method is a method of printing very small ink droplets by colliding with the substrate. The gravure printing method is a method of removing ink on a flat non-smoothened portion with a doctor blade and transferring only the ink buried in the concave portion of the molten metal to the substrate for printing.

The gravure offset printing method is a method in which ink is transferred from a printing plate to a blanket and the ink of the blanket is transferred to the substrate again. The reverse printing method is a method of printing using a solvent as an ink. The flexo printing method is a method of printing ink with embossed portions. The microcontact printing method is a method of printing a desired material on a stamp and printing it as a paint.

The second electrode 50 may be formed of Ag, Al, Ag + Al, Ag + Mg, Ag + Mn, Ag + Sb, Ag + Zn, Ag + as _{Sb 2 O 3: Zn, ITO} , FTO, ZnO, ZnO: B, ZnO: Al, ZnO: H, SnO 2, SnO 2: F, ZnO: Ga 2 O 3, ZnO: Al 2 O 3, SnO 2 Or may be formed by a deposition process including a MOCVD process using the same conductive material, a PECVD process, or a sputtering process.

The finger line electrode 100 may be formed over the entire surface of the photoelectric conversion layer 30 on the surface of the photoelectric conversion layer 30 to collect generated electrons or holes. Since the finger line electrode 100 is an electrode formed on a surface on which sunlight is incident, a plurality of thin lines may be arranged in a contiguous and adjacent arrangement, but the present invention is not limited thereto and other shapes may be used Can also be arranged.

The finger line electrode 100 may be formed of a material having high electrical conductivity. The finger line electrode 100 may include a metal. The finger line electrode 100 may be formed of a metal having high electrical conductivity and may be formed of a metal such as Ag, Ni, Cu, Sn, Zn, (Ti), or gold (Au) may be used. The finger line electrode 100 may be formed by mixing an organic material, a solvent, a glass frit, and the like into a paste, printing and baking the paste, or a plating process using a seed layer.

The finger bar electrode 100 may be electrically connected to the bus bar electrode 200. Electrons or holes collected through the finger line electrode 100 may be transferred to the bus bar electrode 200.

The plurality of finger line electrodes 100 may be disposed symmetrically. The plurality of finger line electrodes 100 may be arranged on the substrate 10 in parallel and may be arranged symmetrically with respect to the center of the substrate 10. [ That is, the finger line electrode 100 may be equally symmetrically formed at the other end opposite to the one end of the substrate 10 at the periphery of the substrate 10. Hereinafter, one end of the substrate 10 will be referred to.

The bus bar electrode 200 may be connected to the second electrode 50 and may be perpendicularly crossed with the finger line electrode 100. The bus bar electrode 200 is formed to be connected to the finger line electrode 100 and the second electrode 50 in common so that the electrons generated by the photoelectric conversion layer 30 move It plays a role. At this time, the bus bar electrode 200 may be formed at each of the opposite side edge portions of the second electrode 50, but is not limited thereto. The bus bar electrode 200 may be formed of Ag, Al, Ag + Al, Ag + Mg, Ag + Mn, Ag + Sb, Ag + Zn, Ag + Mo, Ag + Zn, Ag + Sn + Cu, and the like, and has a low melting point. For example, the bus bar electrode 200 may include a metal material of copper (Cu) and a coating material of an alloy of silver (Ag) and tin (Sn) coated on a metal material to prevent oxidation .

A crystalline solar cell according to the present invention includes a first electrode (20) formed on a substrate (10); A photoelectric conversion layer (30) formed on the first electrode (20); A second electrode (50) formed on the photoelectric conversion layer (30); A plurality of finger line electrodes (100) connected to the second electrode (50); And a plurality of bus bar electrodes 200 connected to the second electrode 50 and perpendicularly crossing the finger line electrodes 100 to collect electrons or holes collected from the finger line electrodes 100 The width of the plurality of finger line electrodes 100 may be determined according to the magnitude of the surface resistance of the solar cell.

The plurality of finger line electrodes 100 may be densely arranged in a region where the surface resistance of the solar cell is large. When the plurality of finger line electrodes 100 are densely arranged in a region where the surface resistance of the solar cell is large, the efficiency of collecting electrons and holes can be improved to improve the efficiency of the solar cell, It is possible to improve the efficiency of the solar cell by increasing the fill factor by making the flow smooth.

The surface resistance of the solar cell may be larger than the center portion of the solar cell, so that the width between the plurality of finger line electrodes 100 at the outer portion of the solar cell is smaller than the width May be smaller than the width between the plurality of finger line electrodes (100). The surface resistance of the solar cell may be greater than the center of the solar cell at the outer portion of the solar cell. In this case, the width between the plurality of finger- It can be arranged more densely in the center portion.

3 to 5 are plan views schematically showing a solar cell according to an embodiment of the present invention.

3 to 5 show only one edge of the substrate 10 for the sake of explanation and that the finger line electrode 100 and the bus bar electrode 200 are formed on the substrate 10.

3 to 5, a width between the plurality of finger line electrodes 100 in the outer frame portion of the substrate 10 is greater than a width of the plurality of finger line electrodes 100 in the central portion of the substrate 10. [ As shown in FIG. The width between the plurality of finger line electrodes 100 gradually decreases from the outer edge of the substrate 10 to the center of the substrate 10 and gradually decreases from the center of the substrate 10 to the center of the substrate 10, The width between the plurality of finger-line electrodes 100 may gradually increase toward the outer side of the finger-shaped electrodes 100. The finger line electrodes 100 may be disposed parallel to each other on the second electrode 50 disposed on the substrate 10.

A crystalline solar cell according to the present invention includes a first electrode (20) formed on a substrate (10); A photoelectric conversion layer (30) formed on the first electrode (20); A second electrode (50) formed on the photoelectric conversion layer (30); A plurality of finger line electrodes (100) connected to the second electrode (50); And a plurality of bus bar electrodes 200 connected to the second electrode 50 and perpendicularly crossing the finger line electrodes 100 to collect electrons or holes collected from the finger line electrodes 100 And the width between the plurality of finger line electrodes 100 at the outer frame portion of the substrate 10 is a first width and the width between the plurality of finger line electrodes 100 at the center portion of the substrate 10 is And the first width may be smaller than the second width.

The plurality of finger line electrodes 100 disposed on the substrate 10 are electrically connected to the first finger line electrode 110, the second finger line electrode 120, A line electrode 130, a fourth finger line electrode 140, and the like. A width between the first finger line electrode 110 and the second finger line electrode 120 is referred to as a first width D1 and a width between the third finger line electrode 130 and the fourth finger line electrode 140 is referred to as a first width D1. The second width D2 may be smaller than the second width D2.

4, the first finger line electrode 110 disposed at the outermost portion of the substrate 10 may be disposed between 0.5 mm and 2.5 mm from one end of the upper surface of the substrate 10 have. The distance between the first finger line electrode 110 and one end of the substrate 10 may be expressed as D4. When the first finger line electrode 110 disposed at the outermost portion of the substrate 10 is disposed within 0.5 mm from one end of the upper surface of the substrate 10, the finger line electrode 100 contacts the substrate 10 ) So that the collection efficiency of electrons or holes can be reduced. When the first finger line electrode 110 disposed at the outermost portion of the substrate 10 is disposed at least 2.5 mm from one end of the upper surface of the substrate 10, The efficiency of the solar cell can be reduced.

In FIGS. 3 and 4, distances between one end of the substrate 10 and the first finger line electrode 110 are denoted by D3 and D4, respectively, and D4 may be smaller than D3. The D4 is arranged to be smaller than the D3 to improve the dead zone of the outermost portion of the upper end of the solar cell, thereby facilitating current collection.

Referring to FIG. 5, in the crystalline solar cell according to the present invention, the width of the finger line electrode 100 may be the largest at the outermost portion of the substrate 10. That is, the width of the first finger line electrode 110 may be greater than the width of the second finger line electrode 120 and the third finger line electrode 130. The width of the first finger line electrode 110 is greater than the width of the second finger line electrode 120 and the third finger line electrode 130 so that the dead zone of the outermost portion of the upper end of the solar cell zone can be improved to facilitate current collection. Although the width of the finger line electrode 100 is described to be the largest at the outermost portion of the substrate 10, the width of the finger line electrode 100 is increased in a region where the surface resistance of the solar cell is large. can do.

The area of the plurality of finger line electrodes 100 and the plurality of bus bar electrodes 200 may be 1% or more and 5% or less of the area of the substrate 10. When the area of the plurality of finger line electrodes 100 and the plurality of bus bar electrodes 200 is less than 1% of the area of the substrate 10, the collecting of electrons and holes may not be performed smoothly , The area of the plurality of finger line electrodes (100) and the plurality of bus bar electrodes (200) is formed to be 5% or more of the area of the substrate (10) The efficiency of the solar cell can be reduced.

A first finger line electrode 110 disposed at an outermost portion of the solar cell and a second finger line electrode 120 closest to the first finger line electrode 110 among the plurality of finger line electrodes 100, The width of the first finger line electrode 110 is larger than the width of the second finger line electrode 120 and the width of the finger line electrode 100 is smaller than the width of the second finger line electrode 120, 100 may be formed to have the same width. In this case, the width of the first finger line electrode 110 may be greater than the width of the other finger line electrode 100, and the width of the finger line electrode 100 disposed on the outermost side of the solar cell The width of the first finger line electrode 110 and the width of the second finger line electrode 120 may be the same as the width of the first finger line electrode 110, (Not shown).

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

10: substrate 20: first electrode
30: photoelectric conversion layer 40: transparent conductive layer
50: second electrode 100: finger line electrode
200: bus bar electrode 110: first finger line electrode
120: second finger line electrode

Claims (11)

A first electrode formed on a substrate;
A photoelectric conversion layer formed on the first electrode;
A second electrode formed on the photoelectric conversion layer;
A plurality of finger line electrodes connected to the second electrode; And
And a plurality of bus bar electrodes connected to the second electrode and vertically crossing the finger line electrodes to collect electrons or holes collected from the finger line electrodes,
Wherein a width between the plurality of finger line electrodes at an outer portion of the substrate is smaller than a width between the plurality of finger line electrodes at a central portion of the substrate. The method according to claim 1,
The width between the plurality of finger line electrodes gradually decreases from the outer frame portion of the substrate to the central portion of the substrate, and the width between the plurality of finger line electrodes increases from the center portion of the substrate to the outer frame portion opposite to the substrate, Lt; RTI ID = 0.0 > increasing < / RTI > The method according to claim 1,
Wherein the first finger line electrode disposed at the outermost portion of the substrate is disposed between 0.5 mm and 2.5 mm from one end of the upper surface of the substrate. The method according to claim 1,
Wherein the width of the finger line electrode is the largest at the outermost portion of the substrate. The method according to claim 1,
Wherein the plurality of finger line electrodes are arranged symmetrically. The method according to claim 1,
Wherein an area of the plurality of finger line electrodes and the plurality of bus bar electrodes is 1% or more and 5% or less of the area of the substrate. A first electrode formed on a substrate;
A photoelectric conversion layer formed on the first electrode;
A second electrode formed on the photoelectric conversion layer;
A plurality of finger line electrodes connected to the second electrode; And
And a plurality of bus bar electrodes connected to the second electrode and vertically crossing the finger line electrodes to collect electrons or holes collected from the finger line electrodes,
Wherein a width between the plurality of finger line electrodes at a periphery of the substrate is a first width and a width between the plurality of finger line electrodes at a center portion of the substrate is a second width, Crystalline solar cells containing small ones. A first electrode formed on a substrate;
A photoelectric conversion layer formed on the first electrode;
A second electrode formed on the photoelectric conversion layer;
A plurality of finger line electrodes connected to the second electrode; And
And a plurality of bus bar electrodes connected to the second electrode and perpendicularly crossing the finger line electrodes to collect electrons or holes collected from the finger line electrodes,
Wherein a width between the plurality of finger line electrodes is determined according to a magnitude of a surface resistance of the solar cell. 9. The method of claim 8,
Wherein a surface resistance of the solar cell includes an outer portion of the solar cell larger than a center portion of the solar cell. 10. The method of claim 9,
Wherein a width between the plurality of finger line electrodes at an outer portion of the solar cell is smaller than a width between the plurality of finger line electrodes at a central portion of the solar cell. 9. The method of claim 8,
Wherein a width of the first finger line electrode in a first finger line electrode disposed at an outermost portion of the solar cell and a second finger line electrode closest to the first finger line electrode among the plurality of finger line electrodes, Wherein the width of the finger electrode is greater than the width of the line electrode and the width of the remaining finger line electrodes is the same except for the finger line electrode disposed at the outermost portion of the solar cell.

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