Classifications

• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K3/00—Apparatus or processes for manufacturing printed circuits
  • H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
  • H05K3/12—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns
  • H05K3/1216—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns by screen printing or stencil printing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F15/00—Screen printers
  • B41F15/08—Machines
  • B41F15/0881—Machines for printing on polyhedral articles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M1/00—Inking and printing with a printer's forme
  • B41M1/12—Stencil printing; Silk-screen printing
• • 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
  • H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
  • H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
  • H05K2201/09—Shape and layout
  • H05K2201/09209—Shape and layout details of conductors
  • H05K2201/09218—Conductive traces
  • H05K2201/09236—Parallel layout
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
  • H05K2203/14—Related to the order of processing steps
  • H05K2203/1476—Same or similar kind of process performed in phases, e.g. coarse patterning followed by fine patterning
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E10/00—Energy generation through renewable energy sources
  • Y02E10/50—Photovoltaic [PV] energy

Definitions

• the invention relates to a method for producing a solar cell, in which the solar cell is printed by the screen printing method in a plurality of production steps.
• flat screen printing units Two types are currently used in screen printing technology: flat screen printing units and rotary screen printing units.
• a printing direction is generally referred to in flat screen printing units, the direction of movement of the doctor over the print material.
• rotary screen printing units the printing direction is defined by the transport direction of the print material.
• the printing pastes are highly viscous liquids, strong adhesion forces, which initially hold the screen after the squeegee has traveled over a point to be printed, on the printed material (solar cell).
• the detachment is made possible by the relatively strong tension of the sieve.
• the sieve jump requires a certain amount of time which depends on various printing parameters (paste, screen texture, printed image). The time required for the Siebabsprung is an important factor, since the printed matter must not be moved until it is done safely. This is another reason why it is customary today to move the screen upwards (away from the print material) before the further transport of the print material, which promotes the screen skip.
• the Siebabsprung turns out to be difficult whenever a printed image on the entire width of the object without interruption to print, such as the full-area backside printing or the busbars, or the fingers in solar cells.
• Individual interruptions of the printing structure such.
• the many individual fingers when printing the solar cell front side simplify the Siebabsprung when they are printed in Rakelschulsraum.
• the printing of the busbars and the fingers for the front side contact so the printing of the solar cell front side, technically represents the biggest challenge.
• the positioning of the solar cell for alignment of the printing screen and the Rakelmonysraum is therefore optimally chosen for this process step as far as possible.
• the fingers of the solar cell front side are printed in the direction of movement of the doctor blade.
• the busbars on the back side of the solar cell are aligned transversely to the fingers of the solar cell front side.
• this object is achieved in a particularly simple and surprising manner by a method of the type mentioned above in which the solar cell and the printing direction are aligned for at least one first printing operation in a first orientation to each other and in at least one further printing operation in another Orientation aligned with each other.
• the solar cell 25 is thus arranged for at least one first printing operation in a first orientation to the doctor movement direction of a doctoring or transport direction of the solar cell and in at least one further printing operation in a different orientation to the doctor movement direction of a doctor blade or the transport direction of the solar cell.
• This dimensional measure ensures that the solar cell is optimally aligned with the direction of doctor movement or transport direction for each printing operation, in particular is aligned to print elongated structures, so that the disadvantages described above can be largely avoided at Siebabsprung.
• the printing cycle is shortened considerably.
• the productivity of the plant on which the process is carried out is increasing.
• the quality of the individual printing processes increases.
• the advantages of this new method apply to flat screen printing units in the same way as for rotary screen printing units.
• the solar cell to be printed is rotated by 90 ° before at least one printing operation.
• the solar cell is brought in a different orientation to the doctor blade movement direction or transport direction in comparison to the preceding printing operation.
• elongated structures arranged perpendicular to previously imprinted structures may be applied in the same blade advance direction as the elongate structures applied in the previous printing operation.
• the solar cell according to the invention for two different printing operations on different orientations with respect to a blade movement direction or transport direction.
• a further optimization with respect to the screening jump results if at least some elongate structures in the printing direction, that is to say the direction of movement of a doctor blade or transport direction of the solar cell, are printed in each printing operation.
• busbars busbars
• z. B. silver paste are printed on the solar cell back, wherein the printing direction in the direction of the extension of clergychristenden
• the solar cell rear side in particular with a printing paste, for. B. aluminum paste, is printed, wherein the printing direction runs in the direction of extension i5 of previously printed on busbars.
• a printing paste for. B. aluminum paste
• the squeegee is moved in the direction of extension of previously printed busbars.
• busbars and fingers are in particular provided with a printing paste, e.g. As silver paste, printed on the solar cell front side, the printing direction in the direction of Er-
• first, second and third printing can therefore refer to a chronological sequence of the printing processes, but need not.
• the solar cell is detected with a gripper before at least one printing operation and is aligned with respect to the printing direction.
• a Bemoulli gripper can be used.
• the solar cell is rotated by 90 ° by the gripper before the third printing process in which the solar cell front side is printed.
• the productivity of a plant in which the process is carried out can be increased if, in at least one printing operation, several solar cells are printed simultaneously. Preferably, several solar cells are printed simultaneously in all printing processes. This means that several solar cells, in particular by a Bernoulli gripper, are reoriented before at least one printing operation.
• the scope of the invention also includes a screen printing machine with a gripper, in particular a Bernoulli gripper for carrying out the method.
• the screen printing machine may have a flat screen printing unit in which the printing direction corresponds to the doctor blade movement direction, or a rotary screen printing unit in which the printing direction corresponds to the transport direction of the printed matter (solar cell).
• Figure 1 is a plan view of the back of two solar cells after a first printing operation.
• FIG. 2 shows a plan view of the back side of two solar cells after a second printing process
• Fig. 3 is a plan view of the front of the solar cells after a third printing operation.
• FIG. 1 shows two solar cells 10, 11, with the rear side 12, 13 is visible.
• the solar cells 10, 11 have on their back side 12, 13 in each case by screen printing simultaneously printed in a first printing so-called busbars 14 to 17.
• the printing direction ie the direction of blade movement in flat screen printing units or the transport direction in rotary screen printing units, is indicated by the arrow 18.
• Busbars 14 to 17 were created by printing a silver paste.
• FIG. 2 shows the solar cells 10, 11, on which in turn an aluminum paste 19, 20 was printed at the same time.
• the printing direction is again indicated by an arrow 21. This means that the printing direction 18, 21 and orientation of the solar cells 10, 11 were the same in both printing processes.
• FIG. 3 shows a plan view of the front side 25, 26 of the solar cells 10, 11.
• the solar cells 10, 11 are rotated relative to the illustrations of Figures 1 and 2 by 90 °.
• This could fingers 27, 28 are applied in the printing direction 29 in a third printing process, wherein the printed as a silver paste fingers 27, 28 are offset from the busbars 14 to 17 of the solar cell rear side by 90 °.
• the busbars 30, 31 of the front sides 25, 26 were also printed transversely to the printing direction 29 in the third printing process.
• the printing directions 18, 21, 29 are therefore the same for all printing processes.
• the orientation of the solar cells 10, 11 with respect to the printing direction 29 has been changed for the printing of the solar cell front side 25, 26.

Landscapes

• Engineering & Computer Science (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Condensed Matter Physics & Semiconductors (AREA)
• Electromagnetism (AREA)
• Life Sciences & Earth Sciences (AREA)
• Sustainable Development (AREA)
• Sustainable Energy (AREA)
• Physics & Mathematics (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• General Physics & Mathematics (AREA)
• Computer Hardware Design (AREA)
• Power Engineering (AREA)
• Printing Methods (AREA)
• Screen Printers (AREA)
• Photovoltaic Devices (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (2)

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ID=40298952

Family Applications (1)

Country Status (5)

Cited By (4)

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Citations (6)

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• 2007
  • 2007-08-29 DE DE200710041057 patent/DE102007041057A1/de not_active Withdrawn
• 2008
  • 2008-08-27 CN CN200880106022A patent/CN101803034A/zh active Pending
  • 2008-08-27 WO PCT/EP2008/007008 patent/WO2009030409A2/de active Application Filing
  • 2008-08-27 KR KR1020107004975A patent/KR101138097B1/ko not_active IP Right Cessation
  • 2008-08-27 EP EP08785710A patent/EP2193548A2/de not_active Withdrawn

Patent Citations (6)

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