WO2019097615A1 - Élément de batterie solaire et procédé de fabrication d'un élément de batterie solaire - Google Patents

Élément de batterie solaire et procédé de fabrication d'un élément de batterie solaire Download PDF

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Publication number
WO2019097615A1
WO2019097615A1 PCT/JP2017/041142 JP2017041142W WO2019097615A1 WO 2019097615 A1 WO2019097615 A1 WO 2019097615A1 JP 2017041142 W JP2017041142 W JP 2017041142W WO 2019097615 A1 WO2019097615 A1 WO 2019097615A1
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Prior art keywords
electrode
tab
electrodes
connection portion
thin wire
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PCT/JP2017/041142
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English (en)
Japanese (ja)
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隼人 幸畑
公一 筈見
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三菱電機株式会社
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Priority to JP2019554103A priority Critical patent/JP6818908B2/ja
Priority to PCT/JP2017/041142 priority patent/WO2019097615A1/fr
Priority to TW107130322A priority patent/TWI688110B/zh
Publication of WO2019097615A1 publication Critical patent/WO2019097615A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02—Details
    • H01L31/0224—Electrodes

Definitions

  • the present invention relates to a solar battery cell provided with an electrode manufactured using an electrode material paste and a method of manufacturing the solar battery cell.
  • the cost of silver used for the silver electrode accounts for a large percentage of the manufacturing cost of the solar cell.
  • the silver electrode is mainly used for the light receiving surface side electrode.
  • a general light receiving surface side electrode is formed over the entire surface of the solar battery cell, and a plurality of thin wire electrodes collecting current generated from the solar cell from the semiconductor substrate, and a collector electrode collecting current from the thin wire electrode And are classified into two types.
  • the thin wire electrodes are generally called grid electrodes, and the collecting electrodes are also called bus bar electrodes.
  • the current collection electrode is used to solder not only current collection from the thin wire electrode but also a lead wire called tab wire for electrically connecting adjacent solar cells when configuring the solar cell module. It also plays a role.
  • the tab wire is generally made of copper (Cu) and has a thickness of several hundred ⁇ m.
  • the conductivity of copper is 1.7 ⁇ cm.
  • the conductivity of silver is 1.6 ⁇ cm, which is close to the conductivity of copper.
  • the price of silver is about 100 times that of copper, and silver is a very expensive material compared to copper.
  • the solar battery cell is finally modularized by electrically connecting a plurality of about 10 to 60 solar battery cells by tab wires. For this reason, as a current collection electrode of a final solar cell module, both the current collection electrode of a solar cell and the tab wire which connects the current collection electrodes of a solar cell correspond. From the viewpoint of conductivity and material cost, the resistance loss of the collector electrode of the solar cell module can be reduced by increasing the thickness of the copper tab wire while minimizing the amount of silver used in the collector electrode as much as possible. Controlling leads to a reduction in the manufacturing cost of the solar cell module.
  • the bonding strength between the current collecting electrode and the tab wire by soldering becomes important. From the viewpoint of reducing the manufacturing cost of the solar battery cell, it is conceivable to reduce the area of the current collecting electrode in the in-plane direction of the solar battery cell. However, when the area of the current collection electrode is reduced, there is a problem that the adhesion strength is reduced in proportion to the decrease of the bonding area to be soldered.
  • Patent Document 1 discloses a solar battery cell of a busbarless structure in which a tab wire is directly adhered so as to cross a finger electrode via a conductive adhesive film without providing a bus bar electrode which is a current collection electrode.
  • This invention is made in view of the above, Comprising: The solar cell which can reduce the usage-amount of an electrode material, ensuring the adhesive strength of the tab wire and electrode which electrically connect solar cells mutually. The purpose is to get.
  • a solar cell according to the present invention is provided on a semiconductor substrate having a pn junction and one surface of the semiconductor substrate, and a first direction in the in-plane direction of the semiconductor substrate And a plurality of thin wire electrodes arranged parallel to each other in a direction in which the semiconductor substrate extends in the in-plane direction of the semiconductor substrate, and connecting two or more adjacent thin wire electrodes provided on one surface of the semiconductor substrate And a plurality of first current collection electrodes distributed in a second direction crossing the first direction.
  • the plurality of thin wire electrodes include a thin wire electrode connected to the first current collection electrode and a thin wire electrode not connected to the first current collection electrode, and a thin wire electrode not connected to the first current collection electrode is a width of the thin wire electrode
  • a tab wire connection portion which is a region for connecting a tab wire, is made wider than the other region in the thin wire electrode, at the same position as the first current collection electrode in the first direction.
  • the solar battery cell according to the present invention has the effect of obtaining a solar battery cell capable of reducing the amount of electrode material used while securing the adhesive strength between the electrode and the tab wire electrically connecting the solar battery cells. Play.
  • the top view which looked at the photovoltaic cell concerning Embodiment 1 of this invention from the light-receiving surface side The bottom view which looked at the photovoltaic cell concerning Embodiment 1 of the present invention from the back side which turns to the side opposite to a light-receiving surface
  • the principal part enlarged view which expands and shows the thin wire electrode of the photovoltaic cell concerning Embodiment 1 of this invention The top view which looked at the state by which the tab wire was connected to the thin wire
  • FIG. 1 is a top view of the solar battery cell 1 according to the first embodiment of the present invention as viewed from the light receiving surface side.
  • FIG. 2 is the bottom view which looked at the photovoltaic cell 1 concerning Embodiment 1 of this invention from the back side which turns to the light receiving surface and the opposite side.
  • FIG. 3 is a cross-sectional view of main parts for describing the cross-sectional structure of the solar battery cell 1 according to the first embodiment of the present invention, and is a cross-sectional view of main parts along line III-III in FIG.
  • FIG. 3 is principal part sectional drawing of the photovoltaic cell 1 of the part in which the tab wire connection part 5c was formed.
  • FIG. 3 is principal part sectional drawing of the photovoltaic cell 1 of the part in which the tab wire connection part 5c was formed.
  • FIG. 4 is a cross-sectional view of relevant parts for describing the cross-sectional structure of the solar battery cell 1 according to Embodiment 1 of the present invention, and is a cross-sectional view of relevant parts taken along line IV-IV in FIG. FIG. 4: is principal part sectional drawing of the solar cell 1 of the part in which the light-receiving surface side current collection electrode 5b was formed.
  • the n-type impurity diffusion layer 3 is formed by phosphorus diffusion on the light receiving surface side of the semiconductor substrate 2 made of p-type polycrystalline silicon, and the semiconductor substrate 11 having a pn junction. And an antireflective film 4 made of a silicon nitride (SiN) film on the n-type impurity diffusion layer 3.
  • the semiconductor substrate 2 is not limited to a p-type polycrystalline silicon substrate, and a substrate such as a p-type single crystal silicon substrate, an n-type polycrystalline silicon substrate, or an n-type single crystal silicon substrate may be used. .
  • the semiconductor substrate 2 is not limited to a silicon substrate, and a semiconductor substrate generally used for crystalline solar cells can be used.
  • minute unevenness (not shown) is formed as a texture structure.
  • the minute asperities increase the area of the light receiving surface to absorb light from the outside, suppress the reflectance on the light receiving surface, and confine light.
  • the light receiving surface side electrode 5 which is a first electrode is formed.
  • the light receiving surface side electrode 5 includes a large number of long thin elongated thin wire electrodes 5a and a plurality of light receiving surface side current collecting electrodes 5b which are the first current collecting electrodes, and prevents reflection on the light receiving surface side of the semiconductor substrate 11. It is formed in a state of being surrounded by the film 4.
  • the second direction is a direction orthogonal to the first direction in the in-plane direction of the semiconductor substrate 2.
  • the thin wire electrode 5a is mainly composed of silver, and a plurality of thin wires are arranged in parallel.
  • the thin wire electrode 5a has a width in the range of about 20 ⁇ m or more and 100 ⁇ m or less and 70 or more and 300 in parallel at predetermined intervals. The following number of ranges is arranged.
  • the thin wire electrode 5 a is electrically connected to the n-type impurity diffusion layer 3 at the bottom portion.
  • the light receiving surface side collecting electrode 5b is electrically connected to the plurality of thin wire electrodes 5a in a state of having an intersection portion intersecting the thin wire electrode 5a, and a plurality of the light receiving surface side collecting electrodes 5b are intermittently provided. That is, the light receiving surface side collecting electrodes 5b are arranged in parallel in parallel with the second direction in a state of crossing the thin wire electrodes 5a.
  • the light receiving surface side collecting electrode 5b has a width of 1 mm or more and 2 mm or less and the number of 2 or more and 5 or less is arranged per solar battery cell, and the electricity collected by the thin wire electrode 5a is externally Take it out.
  • an example in which four light receiving surface side collecting electrodes 5 b are intermittently provided is shown.
  • a plurality of light receiving surface side collecting electrodes 5b are provided intermittently along the second direction, a plurality of light receiving surface side collecting electrodes 5b are arranged at the same position in the first direction. Can be considered together as one. Further, when the solar battery cells 1 are connected to each other to configure a module, a tab line 21 is connected to the light receiving surface side collecting electrode 5b as described later.
  • the back surface aluminum electrode 7 made of aluminum material is provided over the whole except a part of the outer edge region, and the back surface bus electrode 8 mainly made of silver is It is provided.
  • the back surface side electrode 9 which is a 2nd electrode is comprised by the back surface aluminum electrode 7 and the back surface bus electrode 8.
  • a p + layer 10 which is a BSF (Back Surface Field) containing a high concentration impurity is formed.
  • the p + layer 10 is provided to obtain the BSF effect, and raises the electron concentration in the semiconductor substrate 2 by the electric field of the band structure so that the electrons in the semiconductor substrate 2 which is the p type layer do not disappear.
  • the semiconductor substrate 11 when the semiconductor substrate 11 is irradiated with sunlight from the light receiving surface side of the solar battery cell 1, holes and electrons are generated.
  • the generated electrons move toward the n-type impurity diffusion layer 3 by the electric field of the pn junction, ie, the junction surface between the semiconductor substrate 2 and the n-type impurity diffusion layer 3.
  • the generated holes move toward the semiconductor substrate 2 due to the electric field at the pn junction, that is, the junction surface between the semiconductor substrate 2 and the n-type impurity diffusion layer 3.
  • electrons are in excess in the n-type impurity diffusion layer 3 and holes are in excess in the semiconductor substrate 2.
  • photovoltaic power is generated.
  • Photovoltaic power is generated to bias the pn junction in the forward direction, the light receiving surface side electrode 5 connected to the n-type impurity diffusion layer 3 becomes a negative electrode, and the back surface side electrode 9 connected to the semiconductor substrate 2 becomes a positive electrode. Current flows to an external circuit (not shown).
  • Silver paste is generally used as an electrode material of the light-receiving surface side electrode 5 of the silicon solar battery cell, and for example, lead boron glass is added.
  • This glass is frit-like, and for example, 5 wt% to 30 wt% of lead (Pb), 5 wt% to 10 wt% of boron (B), 5 wt% to 15 wt% of silicon (Si), 30 wt% of oxygen (O) It has a composition of 60% by weight, and may be mixed with a few wt.% Of zinc (Zn) and cadmium (Cd).
  • Such lead boron glass melts by heating at a temperature of about 800 ° C., for example, and has the property of eroding silicon.
  • the method of obtaining the electrical contact of a silicon substrate and a silver paste using the characteristic of a glass frit is used.
  • silver paste is used as an electrode material of the light receiving surface side electrode 5.
  • FIG. 5 is a principal part enlarged view which expands and shows the thin wire
  • FIG. 6 is a top view of the thin wire electrode 5a of the solar battery cell 1 according to the first embodiment of the present invention in which the tab wire 21 is connected as viewed from the light receiving surface side.
  • the side current collection electrode 5b is provided intermittently.
  • a plurality of thin wire electrodes 5a are connected to the light receiving surface side collecting electrode 5b. That is, the light receiving surface side collecting electrode 5 b is provided on the light receiving surface which is one surface of the semiconductor substrate 11 and connects two or more adjacent thin wire electrodes 5 a and a plurality of the light receiving surface collecting electrodes are arranged in the second direction. .
  • the light receiving surface side collecting electrode 5b is connected to a part of the thin wire electrodes 5a among the plurality of thin wire electrodes 5a. Therefore, in the thin wire electrode 5a, the thin wire electrode 5a connected to the light receiving surface side collecting electrode 5b and the thin wire electrode 5a not connected to the light receiving surface side collecting electrode 5b exist. Thereby, the usage-amount of silver used for a bus-bar electrode can be reduced rather than the case where a bus-bar electrode is connected to all the thin wire
  • the light receiving surface side collecting electrode 5b has a half area when forming a continuous general bus bar electrode connected to all the thin wire electrodes 5a.
  • the length of the light receiving surface side collecting electrode 5b in the second direction is determined by the balance between the peel strength between the light receiving surface side collecting electrode 5b and the tab wire 21 and the amount of the electrode material used. As the length of the light receiving surface side collecting electrode 5b in the second direction is shorter, the amount of use of the electrode material is reduced, and the manufacturing cost of the solar battery cell 1 is reduced. On the other hand, the peel strength between the light receiving surface side collecting electrode 5b and the tab wire 21 becomes stronger as the length of the light receiving surface side collecting electrode 5b in the second direction becomes longer.
  • the sum of the lengths of the plurality of light receiving surface side collecting electrodes 5 b distributed and disposed in one light receiving surface side collecting electrode 5 b has a square outer shape of the solar battery cell 1 In this case, it is preferable that the length is smaller than half of the length of one side of the square.
  • the length of the light receiving surface side collecting electrode 5b in the second direction is preferably five times or more the width of the light receiving surface side collecting electrode 5b in order to secure the peel strength.
  • the light receiving surface side current collecting electrode 5b has a length of 5 mm or more Is preferred.
  • the tab wire connection portion 5c is provided on the thin wire electrode 5a not connected to the light receiving surface side collecting electrode 5b.
  • the tab wire connection portion 5 c is provided at the same position as the light receiving surface side collecting electrode 5 b in the first direction in the light receiving surface side electrode 5.
  • the tab wire connection portion 5c is a connection portion for soldering the tab wire 21 which electrically connects the solar battery cells 1 with each other when the solar battery module is configured using the plurality of solar battery cells 1,
  • a part of the width is a wide region.
  • tab wire connection portion 5c receives the light from solar battery cell 1 more than the other regions in thin wire electrode 5a.
  • the area of the electrode per unit area in the plane on the surface side is wide. That is, in the region where the tab line connection portion 5c is formed, the arrangement area of the electrode is larger than the other region in the thin wire electrode 5a.
  • the tab wire 21 and the light-receiving surface side electrode 5 are soldered as compared with the case where the tab wire 21 is simply soldered directly to the thin wire electrode 5a not provided with the tab wire connection portion 5c. A wide area can be secured. Therefore, when the tab wire 21 is soldered to the light-receiving surface side electrode 5, it is possible to obtain a practical level of bonding strength between the thin wire electrode 5 a and the tab wire 21 without peeling of the tab wire 21.
  • the plurality of thin wire electrodes 5 a are arranged in parallel in the second direction, with the longitudinal direction as a direction along the first direction in the plane of the solar battery cell 1.
  • the solar battery cell 1 has a first side 2a and a second side 2b which are a pair of sides, and a third side 2c and a fourth side which are another pair of sides. 2d and has a square shape.
  • the length of one side of the square is, for example, 156 mm.
  • the tab wire connection portion 5 c has a rectangular shape in which the longitudinal direction is a direction along the first direction in the plane of the solar battery cell 1.
  • four tab wires of a first tab wire connection portion 5c1, a second tab wire connection portion 5c2, a third tab wire connection portion 5c3, and a fourth tab wire connection portion 5c4 are provided as tab wire connection portions 5c.
  • the connection portions 5c are provided at equal intervals in the first direction, that is, in the longitudinal direction of the thin wire electrode 5a.
  • the tab line 21 is soldered to the tab line connection portion 5c, with the longitudinal direction as the second direction, that is, the direction along the X direction in FIG. 6, as shown in FIG. Therefore, in the plurality of thin wire electrodes 5a, the arrangement positions of the first tab wire connection portions 5c1 in the first direction are the same as shown in FIG. Similarly, in the plurality of thin wire electrodes 5a, the arrangement position of the second tab wire connection portion 5c2 in the first direction is the same position, and the arrangement position of the third tab wire connection portion 5c3 in the first direction is the same position, The arrangement position of the fourth tab wire connection portion 5c4 in the first direction is the same position.
  • the first tab wire connection portions 5c1 of the plurality of thin wire electrodes 5a are arranged along the second direction, with the arrangement direction taken along the second direction.
  • the second tab wire connection portions 5c2 of the plurality of thin wire electrodes 5a are disposed along the second direction
  • the third tab wire connection portions 5c3 of the plurality of thin wire electrodes 5a are disposed along the second direction.
  • the fourth tab wire connection portion 5c4 of the thin wire electrode 5a is disposed along the second direction.
  • the arrangement position of the tab wire connection portion 5c in the first direction is set to a position corresponding to the back surface bus electrode 8 of the back surface side electrode 9.
  • the width X2 of the tab wire connection portion which is the width of the tab wire connection portion 5c in the direction orthogonal to the longitudinal direction of the thin wire electrode 5a is greater than the width X1 of the thin wire electrode It is considered to be wide.
  • the longitudinal direction of the thin wire electrode 5a corresponds to the first direction.
  • the direction orthogonal to the longitudinal direction of the thin wire electrode 5a corresponds to the second direction.
  • the length Y1 of the tab wire connection portion which is the width of the tab wire connection portion 5c in the longitudinal direction of the thin wire electrode 5a is preferably equal to the width of the tab wire 21 in order not to reduce the light receiving area. .
  • the length Y 1 of the tab wire connection portion may be wider than the width of the tab wire 21.
  • FIG. 6 shows the case where the length Y1 of the tab wire connection portion is wider than the width of the tab wire 21 in order to understand the positional relationship between the tab wire connection portion 5c and the tab wire 21.
  • the bonding area between tab wire connection portion 5c and tab wire 21 ie, tab wire connection portion 5c and tab wire 21 it is preferable to widen the soldering area of
  • the width X2 of the tab line connection portion is preferably at least twice as large as the width X1 of the thin wire electrode.
  • the width X2 of the tab line connection portion is preferably equal to or less than the distance X3 between adjacent thin wire electrodes.
  • the width X2 of the tab line connection portion is preferably equal to or less than half the arrangement pitch X4 of the thin wire electrodes in the second direction.
  • the arrangement pitch X4 of the thin wire electrodes in the second direction is the distance between the center positions of the adjacent thin wire electrodes 5a in the second direction.
  • the height of the thin wire electrode 5a including the tab wire connection portion 5c is higher than the height of the bus bar electrode in the case of providing a continuous general bus bar electrode connected to all the thin wire electrodes 5a. Can also be formed high, for example 15 .mu.m.
  • the height of the tab wire connection portion 5c is higher than that of the bus bar electrode. For this reason, from the viewpoint of height, the amount of silver used in the tab line connection portion 5c per unit area in the surface direction of the semiconductor substrate 2 is increased.
  • the width X2 of the tab wire connection portion is equal to or less than half the arrangement pitch X4 of the thin wire electrodes in the second direction, even if the area of the tab wire connection portion 5c is taken into consideration, Increment in usage of silver due to increase in height of tab wire connection 5c from height, reduction in usage of silver due to reduction of the area of light-receiving surface side electrode 5 by providing a region where no bus bar electrode is formed To offset the use of silver.
  • the width X2 of the tab wire connection portion is preferably larger than the width of the thin wire electrode 5a other than the tab wire connection portion 5c, and within a range equal to or less than half the arrangement pitch X4 of the thin wire electrodes in the second direction.
  • line electrode 5a containing the tab line connection part 5c is formed by screen printing, the fluctuation
  • the width X2 of the tab wire connection portion is larger than the width of the thin wire electrode 5a other than the tab wire connection portion 5c at the average value in the length Y1 of the tab wire connection portion, and the arrangement pitch of the thin wire electrodes in the second direction It is preferable to make it the range of half or less of X4.
  • the width X2 of the tab wire connection portion is equal to or less than the width of the thin wire electrode 5a other than the tab wire connection portion 5c, a practical level of bonding strength between the tab wire connection portion 5c and the tab wire 21 can not be secured.
  • the width X2 of the tab wire connection portion is larger than half the arrangement pitch X4 of the thin wire electrodes in the second direction, the effect of reducing the amount of silver used in the light receiving surface side electrode 5 is reduced.
  • FIG. 7 is a flow chart for explaining the procedure of the manufacturing process of the solar battery cell 1 according to the first embodiment of the present invention.
  • the process demonstrated here is the same as the manufacturing process of the general solar cell using a silicon substrate, the general manufacturing process part is not shown in figure in particular.
  • a p-type polycrystalline silicon substrate is prepared as the semiconductor substrate 2, and the p-type polycrystalline silicon substrate is cleaned with hydrogen fluoride and pure water. Thereafter, in step S10, fine irregularities are formed on the surface of the p-type polycrystalline silicon substrate to form a texture structure on the surface.
  • a p-type polycrystalline silicon substrate is immersed in a mixed acid solution mainly containing hydrofluoric acid and nitric acid, and a concavo-convex structure reflecting the shape at the time of slicing is formed on the surface of the p-type polycrystalline silicon substrate Ru.
  • the single crystal silicon substrate is immersed in an alkali solution, and a random pyramid is formed by anisotropic etching to form fine asperities.
  • corrugation does not matter.
  • a pn junction is formed in the semiconductor substrate 2.
  • the formation of the pn junction is carried out by performing a diffusion step of diffusing phosphorus oxychloride (POCl 3 ) by thermal diffusion to a p-type polycrystalline silicon substrate having a textured structure formed on the surface.
  • phosphorus is thermally diffused at a high temperature in a p-type polycrystalline silicon substrate by, for example, vapor phase diffusion in phosphorus oxychloride (POCl 3 ) gas to form phosphorus (P) on the surface layer of the p-type polycrystalline silicon substrate.
  • a pn junction is formed by forming the n-type impurity diffusion layer 3 in which n is diffused.
  • the n-type impurity diffusion layer 3 is formed by heating the p-type polycrystalline silicon substrate at a temperature of 800 ° C. to 900 ° C. for 1 minute to 10 minutes.
  • the n-type impurity diffusion layer 3 is formed on the entire surface of the p-type polycrystalline silicon substrate.
  • the n-type impurity diffusion layer 3 may be formed by solid phase diffusion, and the method of forming the n-type impurity diffusion layer 3 does not matter.
  • phosphorus glass Phosphorus Silicate Grass: PSG
  • PSG phosphorus Silicate Grass: PSG
  • the phosphorus glass layer on the surface of the p-type polycrystalline silicon substrate is removed using a chemical solution such as a hydrofluoric acid solution.
  • step S30 pn separation is performed to electrically insulate the back surface side electrode 9 as the p-type electrode and the light receiving surface side electrode 5 as the n-type electrode, whereby the semiconductor substrate 11 is obtained.
  • the pn separation is formed on the back surface of the p-type polycrystalline silicon substrate by immersing only the back surface of the p-type polycrystalline silicon substrate on which the n-type impurity diffusion layer 3 is formed in a mixed acid solution mainly containing hydrofluoric acid and nitric acid. This can be performed by removing the n-type impurity diffusion layer 3 as described above.
  • the semiconductor substrate 2 made of p-type polycrystalline silicon which is the first conductivity type layer and the n-type impurity diffusion layer 3 which is the second conductivity type layer formed on the light receiving surface side of the semiconductor substrate 2 are pn
  • the semiconductor substrate 11 in which bonding is configured is obtained.
  • pn separation may be performed by cutting and removing the n-type impurity diffusion layer 3 formed in the outer peripheral portion of the p-type polycrystalline silicon substrate by laser irradiation.
  • step S40 for example, plasma chemical vapor phase as anti-reflection film 4 on the light receiving surface side of the p-type polycrystalline silicon substrate on which n-type impurity diffusion layer 3 is formed for surface protection and photoelectric conversion efficiency improvement.
  • Silicon nitride (SiN) is formed by a growth (Plasma-Enhanced Chemical Vapor Deposition: PECVD) method.
  • step S50 the back side electrode 9 is printed on the p-type polycrystalline silicon substrate by screen printing and dried. That is, an aluminum paste, which is an electrode material paste, is applied to the back surface side of the p-type polycrystalline silicon substrate by screen printing in the shape of the back surface aluminum electrode 7, and a silver paste, which is an electrode material paste, is further formed in the shape of the back bus electrode 8. Apply and dry.
  • an aluminum paste which is an electrode material paste
  • a silver paste which is an electrode material paste
  • step S60 the light-receiving surface side electrode 5 is printed on the p-type polycrystalline silicon substrate by screen printing and dried. That is, as shown in FIG. 8, using a printing mask in which an opening corresponding to the shape of the light receiving surface side electrode 5 is formed on the antireflection film 4 on the light receiving surface side of the p-type polycrystalline silicon substrate.
  • the silver paste 31 which is a material paste is applied to the shape of the light receiving surface side electrode 5 by screen printing, the silver paste 31 is dried.
  • FIG. 8 is a top view showing a state in which the silver paste 31 for forming the light-receiving surface side electrode according to the first embodiment of the present invention is printed on a p-type polycrystalline silicon substrate.
  • FIG. 9 is a schematic cross-sectional view for explaining screen printing of the light-receiving surface side electrode 5 according to the first embodiment of the present invention.
  • FIG. 10 is an enlarged view of an essential part showing the opening 44 in the printing mask 41 used for screen printing of the light-receiving surface side electrode 5 according to the first embodiment of the present invention.
  • the printing mask 41 used for printing the light receiving surface side electrode 5, that is, the printing mask 41 used when collectively printing the light receiving surface side collecting electrode 5b, the thin wire electrode 5a and the tab line connection portion 5c is shown in FIG.
  • a film of an organic component called emulsion 43 is formed on a part called mesh 42 formed by braiding a metal wire having a wire diameter of 10 ⁇ m to 100 ⁇ m, and the emulsion 43 of the portion corresponding to the printing area It is removed and the opening 44 is formed.
  • an opening 44 for printing the thin wire electrode 5a and the tab wire connection portion 5c is shown.
  • the silver paste 31 When printing the silver paste 31, the silver paste 31 is applied on the printing mask 41, and a plate component made of rubber called a squeegee 45 is moved on the printing mask 41 in a predetermined direction to open the opening of the silver paste 31.
  • the electrodes are printed by pushing them down the printing mask 41 from 44.
  • the light receiving surface side electrode 5 includes the thin wire electrode 5a, the tab wire connection portion 5c, and the light receiving surface side collecting electrode 5b, but the width of the thin wire electrode 5a is in the range of 20 ⁇ m to 100 ⁇ m. , Width is narrow.
  • the first opening 46 which is an opening corresponding to the thin wire electrode 5a in the opening 44 has the same size as the width X1 of the thin wire electrode or the same size as the width of the thin wire electrode 5a to be printed.
  • the dimension is larger than the width X1 of the thin wire electrode. Therefore, in the first opening 46, the opening width X1a, which is the opening width corresponding to the width X1 of the thin line electrode, is narrow, and it is difficult to stably print the silver paste 31 in the shape of the thin line electrode 5a.
  • the moving direction of the squeegee 45 on the printing mask 41 is the same as the longitudinal direction of the thin wire electrode 5 a to be printed, that is, the same as the longitudinal direction of the first opening 46.
  • the longitudinal direction of the first opening 46 and the longitudinal direction of the contact surface between the upper surface 41a of the printing mask and the squeegee 45 are orthogonal to each other. That is, the longitudinal direction of the first opening 46 and the longitudinal direction of the lower end portion of the squeegee 45 are orthogonal to each other.
  • the lower end portion of the squeegee 45 is held by the upper surface 41 a of the printing mask positioned between the first openings 46 adjacent in the longitudinal direction of the lower end portion of the squeegee 45. Therefore, the silver paste 31 can be printed with a desired thickness without the squeegee 45 falling into the opening 44.
  • the width X2 of the tab wire connection portion is larger than the width of the thin wire electrode 5a other than the tab wire connection portion 5c, and is within the range of half or less of the arrangement pitch X4 of the thin wire electrodes in the second direction.
  • the width X2 of the tab wire connection portion is in the range of 0.25 ⁇ m or more and 1 mm or less.
  • the second opening 47 which is an opening corresponding to the tab wire connection 5c at the opening 44, has the same dimension or tab line as the width X2 of the tab wire connection corresponding to the width X2 of the tab wire connection.
  • the opening width X2a which is the opening width corresponding to the width X2 of the tab wire connection portion in the second opening 47, is wider than the opening width X1a.
  • the opening width X2a is narrower than the width of a general bus bar electrode.
  • the width of a typical bus bar electrode is in the range of 1 mm or more and 2 mm or less.
  • the lower end portion of the squeegee 45 is in the region of the second opening 47.
  • the squeegee 45 is held by the upper surface 41 a of the printing mask positioned between the adjacent second openings 47 in the longitudinal direction of the lower end of the squeegee 45. Therefore, the silver paste 31 can be printed with the same desired thickness as the first opening 46 without the squeegee 45 falling into the second opening 47.
  • variety of a bus-bar electrode is generally 1 mm or more and 2 mm or less, and is significantly wider than the width of a thin wire
  • the bus bar electrodes are formed in a direction orthogonal to the grid electrodes, that is, the thin wire electrodes. Then, in order to make the movement direction of the squeegee 45 the same as the longitudinal direction of the thin wire electrode 5a, in the printing mask, the longitudinal direction of the opening corresponding to the bus bar electrode and the longitudinal direction of the lower end of the squeegee become parallel.
  • the lower end of squeegee 45 is the opening 44 is held by the upper surface 41a of the printing mask positioned between the second openings 47 adjacent in the longitudinal direction of the lower end of the squeegee 45 when passing through the region corresponding to the light receiving surface side collecting electrode 5b (not shown) Ru. Therefore, the squeegee 45 does not fall into the area corresponding to the light receiving surface side current collecting electrode 5 b in the opening 44. Therefore, the light receiving surface side collecting electrode 5b in the first embodiment can be formed at the same height as the thin wire electrode 5a.
  • the printing conditions differ depending on the design value of the opening width, the type of the electrode material paste, and the printing conditions, but in the solar cell 1, the height of the thin line electrode is the thin line electrode 5a of the solar cell 1 and When compared with a common bus bar electrode, the tab wire connection portion 5c having a height higher than that of a common solar cell having the same common bus bar electrode connected to all the thin wire electrodes is formed. can do. That is, it is possible to form the tab wire connection portion 5c which is thicker than a general bus bar electrode.
  • step S70 the paste printed on the p-type polycrystalline silicon substrate is fired to form the thin line electrode 5a as the light receiving surface side electrode 5, the tab wire connection portion 5c and the light receiving surface side collecting electrode 5b, and the back surface.
  • the back surface aluminum electrode 7 and the back surface bus electrode 8 as the side electrode 9 are obtained.
  • the light-receiving surface side electrode 5 fires through the anti-reflection film 4 which is an insulating film to conduct with the n-type impurity diffusion layer 3.
  • the region immediately below the back surface aluminum electrode 7 is changed to the p + layer 10 by the diffusion of aluminum.
  • the solar battery cell 1 according to the first embodiment shown in FIGS. 1 to 3 is manufactured.
  • the order of arrangement of the paste, which is an electrode material, on the semiconductor substrate 11 may be switched between the light receiving surface side and the back surface side.
  • the solar battery cell 1 described above includes the light receiving surface side collecting electrode 5b and the tab wire connecting portion 5c on the light receiving surface side electrode 5 so that the tab line 21 is formed on the light receiving surface side collecting electrode 5b of the light receiving surface side electrode 5 It is soldered to the light receiving surface side electrode 5.
  • the light receiving surface side collecting electrode 5 b can secure a wide bonding area with the tab wire 21, it is possible to obtain a practical level of bonding strength in which peeling of the tab wire 21 does not occur.
  • the tab wire connection region in which the light-receiving surface side collecting electrode 5b is not formed that is, the thin wire electrode 5a to which the light-receiving surface side collecting electrode 5b is not connected is connected
  • a tab wire connection portion 5c is formed in the region.
  • the width X2 of the tab line connection portion is wider than the width X1 of the thin wire electrode. For this reason, in a region where the thin wire electrode 5a to which the light receiving surface side collecting electrode 5b is not connected and the tab wire 21 are connected, the tab wire 21 is simply soldered directly to the thin wire electrode 5a not provided with the tab wire connection portion 5c.
  • the area where the tab wire 21 and the thin wire electrode 5a are soldered can be secured widely. Therefore, when the tab wire 21 is soldered to the light-receiving surface side electrode 5, it is possible to obtain a practical level of bonding strength between the thin wire electrode 5 a and the tab wire 21 without peeling of the tab wire 21.
  • the joint area with the tab wire 21 by soldering can be ensured widely.
  • a plurality of solar battery cells are formed by forming the tab wire connection portion 5c in which the length Y1 of the tab wire connection portion is the same as the width of the tab wire 21 and the width X2 of the tab wire connection portion is 200 ⁇ m.
  • the adhesive strength between the thin wire electrode 5 a and the tab wire 21 can be secured at a practical level without any problem in the solar cell module in which 1 is connected by the tab wire 21.
  • the solar battery cell 1 since the solar battery cell 1 includes the light receiving surface side collecting electrode 5b disposed intermittently in the second direction, the solar cell 1 is compared with the case where a continuous general bus bar electrode connected to all the thin wire electrodes 5a is formed. Thus, the amount of silver used to form the bus bar electrode can be reduced.
  • the solar battery cell 1 has an increase in the width of the tab wire connection portion 5c from the width of the other region in the thin wire electrode 5a and the light receiving surface side collector in comparison with the solar battery cell not provided with the tab wire connection portion 5c.
  • the amount of silver used as the electrode material is increased by an amount corresponding to an increase in height of the electrode 5 b higher than that of the continuous general bus bar electrode and equivalent to the height of the thin wire electrode 5 a. .
  • the solar battery cell 1 adjusts the length of the light receiving surface side collecting electrode 5b in the second direction to provide the continuous light receiving surface side electrode 5 as compared with the case where the continuous bus bar electrode is provided.
  • the amount of silver used can be significantly reduced.
  • the width of the thin wire electrode 5a is expanded to expand the area
  • the portion 5c is used as a connection portion of the tab wire 21 to which the tab wire 21 is soldered.
  • the solar battery cell 1 can solder the tab wire 21 to the light receiving surface side electrode 5 while largely reducing the usage amount of silver in the light receiving surface side electrode 5, and there is no problem in the solar battery module
  • the adhesive strength of the tab wire 21 can be secured at a practical level.
  • the opening width X1a corresponding to the width X1 of the thin line electrode in the printing mask 41 for printing the thin line electrode 5a is in the range of 20 ⁇ m to 50 ⁇ m, and only the opening width X2a corresponding to the width X2 of the tab line connection portion The range is 100 ⁇ m or more and 700 ⁇ m or less.
  • the height of the thin wire electrode 5a including the tab wire connection portion 5c can be 15 ⁇ m.
  • the thickness is 15 ⁇ m or more It is possible to form the thin wire
  • the heights of the thin line electrodes 5a including the tab line connection portion 5c are all the thin line electrodes 5a. It can form higher than the height of the bus-bar electrode in the case of providing the continuous common bus-bar electrode to connect.
  • the contact area of the tab wire 21 and the light-receiving surface side electrode 5 is reduced as compared with the case where the continuous general bus bar electrodes connected to all the thin wire electrodes 5a are provided, It is possible to compensate the adhesive strength per unit area of the region connected to the wire 21 by thickening the tab wire connecting portion 5 c connected to the tab wire 21. This is because there is a correlation between the adhesion strength between the electrode and the tab wire by soldering and the thickness of the electrode, and that the thicker thickness of the electrode is advantageous in terms of adhesion strength. doing.
  • the width of the normal current collecting electrode is 1 mm or more and 2 mm or less
  • the width of the light receiving surface side current collecting electrode 5 b may be extremely thinned to, for example, 100 ⁇ m. Thereby, the usage-amount of silver in the light-receiving surface side electrode 5 can be reduced more significantly. Even when the light receiving surface side collecting electrode 5b is eliminated, connection of the tab wire 21 to the solar battery cell 1 is possible.
  • a collector electrode may be required. For example, by providing the light receiving surface side collecting electrode 5b having a width of 100 ⁇ m in the solar battery cell 1, the output characteristic of the solar battery cell 1 is measured while reducing the amount of the electrode material used in the light receiving surface side electrode 5. It becomes possible.
  • FIG. 11 is a top view of another solar battery cell 51 according to the first embodiment of the present invention as viewed from the light receiving surface side.
  • FIG. 12 is an enlarged view of an essential part showing a thin wire electrode 5a of another solar battery cell 51 according to the first embodiment of the present invention.
  • FIG. 13 is a top view of a state in which the tab wire 21 is connected to the thin wire electrode 5a of another solar battery cell 51 according to the first embodiment of the present invention as viewed from the light receiving surface side. As shown to FIG. 11 and FIG.
  • the shape of the tab wire connection part 5c in the surface direction of the other photovoltaic cell 51 is made into the shape of a rhombus.
  • the other solar battery cell 51 has the same effect as the solar battery cell 1 because it includes the tab wire connection portion 5c.
  • the tab wire connecting portion 5c when the tab wire connecting portion 5c is shaped like a rhombus, the tab wire 21 and the tab wire connecting portion 5c and the tab wire connecting portion 5c are displaced when the tab wire 21 is shifted in the longitudinal direction The effect is obtained that a wider connection area can be secured.
  • Tab line 21 for rectangular tab wire connection 5c and rhombus tab wire connection 5c having the same length Y1 of tab wire connection and width equal to the width of tab wire connection 5c in the longitudinal direction of thin wire electrode 5a.
  • the connection area between the and the tab wire connection portion 5c is compared and considered.
  • the length Y1 of the tab wire connection portion of the rhombic tab wire connection portion 5c corresponds to the length of the diagonal in the Y direction, that is, the first direction in the rhombic tab wire connection portion 5c.
  • the width X2 of the tab wire connection of the diamond shaped tab wire connection 5c is the width of the tab wire connection of the rectangular tab wire connection 5c.
  • the width X2 of the tab wire connection portion of the diamond shaped tab wire connection portion 5c corresponds to the diagonal length in the X direction, that is, the second direction in the diamond shaped tab wire connection portion 5c. A case will be considered in which the tab line 21 deviates from the proper arrangement position on the tab line connection portion 5c in the first direction.
  • the width of the tab wire 21 is the same as the length Y1 of the tab wire connection portion in the tab wire 21 and the tab wire connection portion 5c.
  • the area will be the same. If the displacement of the tab wire 21 from the proper arrangement position on the tab wire connection portion 5c is less than half of the tab wire connection portion 5c, the area of the connection region between the tab wire 21 and the tab wire connection portion 5c is rhombus The tab wire connection 5c is larger.
  • FIG. 14 is a top view of another solar battery cell 52 according to the first embodiment of the present invention as viewed from the light receiving surface side.
  • FIG. 15 is a principal part enlarged view which expands and shows the thin wire
  • FIG. 16 is a top view of the thin wire electrode 5a of another solar battery cell 52 according to the first embodiment of the present invention in which the tab wire 21 is connected as viewed from the light receiving surface side.
  • the shape of the tab line connection portion 5c in the in-plane direction of the other solar cells 52 is triangular.
  • the other solar battery cell 52 has the same effect as the solar battery cell 1 because it includes the tab wire connection portion 5c.
  • the electrode pattern of the tab line connection portion 5c is asymmetrical by making the shape of the tab line connection portion 5c triangular, so that the direction of the solar cell 1 can be easily recognized. can get.
  • the solar battery cell 1 is the light receiving surface side collecting electrode 5 b provided intermittently in the second direction, that is, the light receiving surface provided locally in the tab wire connection region.
  • the side current collection electrode 5b is provided.
  • the solar battery cell 1 can reduce the usage amount of silver for forming the bus bar electrodes, as compared with the case where the continuous general bus bar electrodes connected to all the thin wire electrodes 5a are formed.
  • the area covered by the light receiving surface side electrode 5 on the light receiving surface side of the solar battery cell 1 is adjusted by adjusting the area of the light receiving surface side collecting electrode 5 b disposed intermittently in the second direction. It is possible to set the coverage to less than half that in the case where there are continuous general bus bar electrodes connected to all the thin wire electrodes 5a, and to reduce the amount of silver used in the light receiving surface side electrode 5 Can.
  • the width X2 of the tab wire connection portion is set to half or less of the arrangement pitch X4 of the thin wire electrodes in the second direction, the light receiving surface side electrode in the tab wire connection region where the light receiving surface side collecting electrode 5b is not formed
  • the area of 5 can be reduced to half or less, and the amount of silver used can be significantly reduced.
  • the distance between the adjacent thin wire electrode 5a and the thin wire electrode 5a is 1.5 mm, and the tab wire connection portion 5c is rectangular.
  • the electrode volumes of the bus bar electrode and the tab wire connection portion 5c in this case are compared.
  • the width of the tab line 21 is 1.0 mm.
  • the width of the tab wire connection portion 5c is made equal to or less than half the pitch of the thin wire electrode 5a in the second direction, it is used for the light receiving surface side electrode 5 Can be expected to reduce the amount of silver used.
  • the tab wire 21 in the portion of the tab wire connecting portion 5c where the width of the thin wire electrode 5a is wide in the solar battery cell 1 Can be bonded by soldering. Therefore, even when the tab wire connection portion 5c is a rectangle having a width of 200 ⁇ m, for example, the solar battery cell 1 can ensure the adhesive strength with the tab wire 21 at a practical level without any trouble in the solar cell module.
  • the adhesive strength naturally depends on the electrode paste material, the material of the tab wire, and the soldering conditions.
  • the solar battery cell 1 greatly reduces the usage amount of silver used for the current collection electrode by providing the tab wire connection region where the light reception surface side current collection electrode 5b does not exist, while the light reception surface side current collection electrode 5b In the tab line connection area where there are no lines, the bonding strength between the thin wire electrode 5a and the tab line 21 can be improved by widening the area to expand only the portion joined to the tab line 21.
  • FIG. 17 is a top view of another solar battery cell 53 according to the first embodiment of the present invention as viewed from the light receiving surface side.
  • another solar battery cell 53 has three thin line electrodes 5 a between the light receiving surface side collecting electrode 5 b and the light receiving surface side collecting electrode 5 b in the second direction, and one solar cell
  • the tab wire connection portion 5 c is provided only on the thin wire electrode 5 a of By providing the thin wire electrode 5a not provided with the tab wire connection portion 5c in the thin wire electrode 5a not connected to the light receiving surface side collecting electrode 5b, the usage amount of silver in the light receiving surface side electrode 5 can be further reduced.
  • the tab wire connection portion 5c is formed on one thin wire electrode 5a adjacent to the thin wire electrode 5a not provided with the tab wire connection portion 5c. Further, among the thin wire electrodes 5a not connected to the light receiving surface side collecting electrode 5b, the light receiving surface side collecting electrode 5b is formed on the other thin wire electrode 5a adjacent to the thin wire electrode 5a not provided with the tab wire connection portion 5c. It is done. When the tab wire 21 is soldered to the light receiving surface side electrode 5, the bonding strength between the adjacent thin wire electrode 5a and the tab wire 21 is secured in the thin wire electrode 5a in which the tab wire connection portion 5c is not provided. Thus, peeling of the tab wire 21 is prevented.
  • the width X2 of the tab wire connection portion may be half or less of the arrangement pitch X4 of the thin wire electrodes. It is also possible to widen the range where reduction of the amount of use can be expected.
  • the solar battery cell 1 uses the electrode material while securing the adhesive strength between the tab wire 21 electrically connecting the solar battery cells 1 and the light receiving surface side electrode 5. There is an effect that the production cost of the solar battery cell 1 can be reduced by reducing the amount.
  • FIG. 18 is a top view of the solar battery cell 54 according to the second embodiment of the present invention as viewed from the light receiving surface side.
  • the solar battery cell 54 concerning this Embodiment 2 is extended in a 2nd direction, and electrically connects several tab wire connection part 5c arrange
  • the difference from the solar battery cell 1 according to the first embodiment is that the second current collection electrode 5d is provided.
  • the tab wire connection portion 5 c and the second current collection electrode 5 d are soldered to the tab wire 21.
  • the width of the second current collection electrode 5d is largely thinned to 100 ⁇ m.
  • the thin wire electrode 5 a is provided with the tab wire connection portion 5 c to be soldered to the tab wire 21 and the light receiving surface side collecting electrode 5 b is not provided. A wide area for soldering 5a and tab wire 21 is secured. Thereby, in the solar cell 54, the same effect as the solar cell 1 according to the first embodiment can be obtained.
  • the 2nd current collection electrode 5d in the photovoltaic cell 54 has a function which collects an electric current from the thin wire
  • the main function is to electrically connect thin wire
  • the solar battery cell 54 electrically connects the thin wire electrodes 5a to each other by electrically connecting the plurality of tab wire connection portions 5c arranged in the second direction.
  • the second current collecting electrode 5d it is possible to alleviate the resistance loss due to the concentration of carriers on other thin wire electrodes 5a when the thin wire electrode 5a is broken.
  • the second current collection electrode 5d is formed simultaneously with the thin wire electrode 5a and the like in step S60 and step S70.
  • variety of the 2nd current collection electrode 5d mentioned above is the range of 30 micrometers or more and 300 micrometers or less. If the width of the second collecting electrode 5d is less than 30 ⁇ m, the formation by screen printing is difficult, and there is a problem that the second collecting electrode 5d is broken. When the width of the second current collection electrode 5d is greater than 300 ⁇ m, the amount of use of the second current collection electrode 5d increases, and the effect of reducing the amount of silver used in the light receiving surface side electrode 5 decreases. In addition, since the 2nd current collection electrode 5d is formed by screen printing, the fluctuation
  • FIG. 19 is a top view of another solar battery cell 55 according to Embodiment 2 of the present invention as viewed from the light receiving surface side.
  • Another solar battery cell 55 is a modification of the solar battery cell 54 according to the second embodiment, and extends in the second direction similarly to the solar battery cell 54, and the first direction in the plurality of thin wire electrodes 5a.
  • a second current collecting electrode 5d electrically connecting the plurality of tab wire connection portions 5c arranged at the same position in the device.
  • the thin wire electrode 5a is not formed in a region surrounded by the light receiving surface side collecting electrode 5b, which is the first collecting electrode, and the second current collecting electrode 5d.
  • the plurality of tab wire connection portions 5c arranged in the second direction are electrically connected to each other by the second current collection electrode 5d, similarly to the solar cells 54. Therefore, as shown in FIG. 19, the thin line electrode 5a may not be formed in the region surrounded by the light receiving surface side collecting electrode 5b, which is the first collecting electrode, and the second current collecting electrode 5d. . By eliminating the thin line electrode 5a in the area surrounded by the light receiving surface side collecting electrode 5b and the second current collecting electrode 5d, which are the first current collecting electrode, the amount of silver used in the light receiving surface side electrode 5 can be further reduced. .
  • the tab wire connection portion 5 c and the second current collection electrode 5 d are soldered to the tab wire 21.
  • the width of the second current collection electrode 5d is largely thinned to 100 ⁇ m.
  • the thin wire electrode 5 a is provided with the tab wire connection portion 5 c to be soldered to the tab wire 21 and the light receiving surface side collecting electrode 5 b is not provided. A wide area for soldering 5a and tab wire 21 is secured.
  • the thin wire electrode 5a which is not connected to the light receiving surface side collecting electrode 5b and which does not have the tab wire connecting portion 5c is connected to the second current collecting electrode 5d.
  • the tab wire 21 is soldered to the light receiving surface side electrode 5
  • the thin wire electrode 5a which is not connected to the light receiving surface side collecting electrode 5b and does not have the tab wire connection portion 5c is connected to the second collection Since the adhesion strength between the thin wire electrode 5a adjacent to the light receiving surface side collecting electrode 5b and the tab wire 21 is secured by adhesion of the electrode 5d and the tab wire 21, peeling of the tab wire 21 is achieved. Is prevented. Therefore, in the other solar cell 55, the same effect as the solar cell 1 according to the first embodiment can be obtained.
  • the measurement of the current-voltage characteristic which is the output characteristic of the solar battery cell that is, the IV measurement can be performed using a four-terminal method.
  • the current collecting electrode at the light receiving surface side electrode is connected to a current measuring device connected to a measuring device for measuring an output characteristic of a solar battery cell at the time of measuring a current-voltage characteristic, and for a voltage measuring device connected to the measuring device It also plays the role of an external terminal for contacting a voltage terminal.
  • the resistance between the current terminal and the voltage terminal is high, it is necessary to be careful because the voltage drop in the corresponding area adversely affects the IV measurement.
  • the IV measurement of the photovoltaic cell 1 is performed using a four-terminal method in which the current and the voltage generated in the photovoltaic cell 1 are measured at different terminals.
  • IV measurement of a solar cell is performed by a two-terminal method in which current and voltage are measured at the same terminal, the measured voltage is a voltage drop generated by the current flowing in the contact resistance portion between the terminal and the solar cell Including. For this reason, when performing IV measurement of a photovoltaic cell by a 2 terminal method, a voltage different from the surface of a photovoltaic cell will be measured, and an error will arise in the measured voltage.
  • the four-terminal method a voltage terminal and a current terminal are separated, and dedicated terminals are used for each of the voltage terminal and the current terminal. As a result, no current flows in the voltage terminal, and the voltage drop at the contact resistance portion described above can be excluded.
  • the four-terminal method it is necessary to make the measurement place of current and voltage the same. However, if, for example, the distance between the current terminal and the voltage terminal is large, or if the resistance between the current terminal and the voltage terminal is high, a voltage drop may occur between the voltage terminal and the current terminal. , There is a possibility of incorrect measurement.
  • the IV measurement can be performed by bringing the current terminal for current measurement and the voltage terminal for voltage measurement into contact with the tab wire connection portion 5c.
  • the width of the thin wire electrode is about 100 ⁇ m and is very thin, so it is difficult to bring the terminal into contact with the thin wire electrode.
  • the tab wire connection portion 5c can be expanded to a width of, for example, 2 mm. Thereby, in the solar battery cell 1, when performing IV measurement, it becomes easy to make a thin electrode contact a terminal.
  • FIG. 20 is a cross sectional view showing a state in which current terminal 61 and voltage terminal 62 are in contact with tab wire connection portion 5 c of solar battery cell 1 in the third embodiment of the present invention, and a cross sectional view along the second direction. It is.
  • tab wire connection portion 5c In order to perform IV measurement using tab wire connection portion 5c, as shown in FIG. 20, tab wire connection portion 5c needs to be present in the region from the end of current terminal 61 to the end of voltage terminal 62. There is. The voltage drop in the tab wire connection portion 5c affects the measurement accuracy, and the tab wire connection portion 5c is present, so that the resistance is low and the voltage drop is small.
  • the number of tab wire connection portions 5c is preferably 2 or more for the stability of measurement because the voltage terminals are in contact with the tab wire connection portions 5c.
  • the number of light receiving surface side collecting electrodes 5b is preferably equal to or larger than the number of tab line connecting portions 5c.

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Photovoltaic Devices (AREA)

Abstract

L'invention concerne un élément de batterie solaire qui est pourvu : d'un substrat semi-conducteur (11) ayant une jonction p-n ; d'une pluralité d'électrodes en ligne mince (5a) qui sont disposées sur une surface du substrat semi-conducteur (11) et qui, tout en s'étendant dans une première direction dans une direction dans le plan du substrat semi-conducteur (11), sont agencées parallèlement les unes par rapport aux autres dans une direction croisant la première direction dans la direction dans le plan du substrat semi-conducteur (11) ; et d'une pluralité de premières électrodes de collecteur de courant qui sont disposées sur la seule surface du substrat semi-conducteur (11) et qui, tout en reliant au moins deux électrodes de ligne mince adjacentes (5a), sont agencées de manière distribuée dans une seconde direction croisant la première direction. La pluralité d'électrodes de ligne mince (5a) comprennent des électrodes de ligne mince (5a) qui se raccordent aux premières électrodes de collecteur de courant, et des électrodes de ligne mince (5a) qui ne sont pas raccordées aux premières électrodes de collecteur de courant. Les électrodes de ligne mince (5a) non raccordées aux premières électrodes de collecteur de courant sont pourvues de parties de raccordement de ligne de languette (5c), qui sont des régions pour raccorder des lignes de languette et dans lesquelles la largeur de l'électrode de ligne mince (5a) est plus large que celle des autres régions des électrodes de ligne mince (5a), les parties de raccordement de ligne de languette (5c) étant disposées dans les mêmes positions dans la première direction que les premières électrodes de collecteur de courant.
PCT/JP2017/041142 2017-11-15 2017-11-15 Élément de batterie solaire et procédé de fabrication d'un élément de batterie solaire WO2019097615A1 (fr)

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JP2019554103A JP6818908B2 (ja) 2017-11-15 2017-11-15 太陽電池セルおよび太陽電池セルの製造方法
PCT/JP2017/041142 WO2019097615A1 (fr) 2017-11-15 2017-11-15 Élément de batterie solaire et procédé de fabrication d'un élément de batterie solaire
TW107130322A TWI688110B (zh) 2017-11-15 2018-08-30 太陽電池單元及太陽電池單元的製造方法

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WO2012121349A1 (fr) * 2011-03-08 2012-09-13 日立化成工業株式会社 Cellule solaire, module de cellules solaires, et procédés de fabrication de ceux-ci
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