# US 8,785,767 B2 · Method for fixing a photovoltaic cell connector on a surface of a photovoltaic cell, photovoltaic cell connector forming die, device for fixing a photovoltaic cell connector on a surface of a photovoltaic cell

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- Number: US 8,785,767 B2
- Document ID: US8785767B2
- Status: Granted
- Kind: B2
- Application number: 13/099,417
- Filed: 2011-05-03
- Published: 2011-11-10
- Granted: 2014-07-22
- Earliest claimed: 2010-05-04
- Assignees: Solarworld Innovations GmbH
- Applicants: Harald Hahn; Olaf Storbeck
- Inventors: Harald Hahn; Olaf Storbeck
- Web page: https://patentgrep.com/patent/US8785767B2

## CPC

- H10F 77/211: {for photovoltaic cells}
- B23K 1/0016: {Soldering of electronic components}
- H10F 77/223: {for metallisation wrap-through [MWT] photovoltaic cells}
- H10F 77/70: Surface textures, e.g. pyramid structures
- H10W 72/013: {of die-attach connectors}
- H10W 72/07141: {Means for applying energy, e.g. ovens or lasers}
- H10W 72/073: {of die-attach connectors}
- H10W 72/07336: {Soldering or alloying}
- H10W 72/30: Die-attach connectors
- H10W 72/381: {Auxiliary members}
- Y02E 10/52: PV systems with concentrators
- Y10T 29/49117: Conductor or circuit manufacturing
- Y10T 29/53174: Means to fasten electrical component to wiring board, base, or substrate
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

In various embodiments, a method for patterning the surface of a solder-covered photovoltaic cell connector on the light-incidence side of a photovoltaic cell is provided. The method may include heating at least a part of the solder-covered photovoltaic cell connector which is in contact with the surface of the photovoltaic cell; patterning at least a part of the surface of the heated part of the solder-covered photovoltaic cell connector so that a predetermined surface pattern is formed; and cooling the photovoltaic cell connector by means of which the pattern is fixed on the solder-covered surface of the photovoltaic cell connector.

## Claims

### Claim 1

A method for patterning the surface of a solder-covered photovoltaic cell connector on the light-incidence side of a photovoltaic cell, the method comprising:
heating at least a part of the solder-covered photovoltaic cell connector which is in contact with the surface of the photovoltaic cell;
bonding the photovoltaic cell connector to contact areas of the photovoltaic cell;
patterning at least a part of the surface of the heated part of the solder-covered photovoltaic cell connector during said bonding so that a predetermined surface pattern is formed; and
cooling the photovoltaic cell connector by means of which the pattern is fixed on the solder-covered surface of the photovoltaic cell connector,
wherein the pattern is a trench pattern,
wherein the surface of the cell connector is patterned in such a manner that incident light is reflected from the surface of the photovoltaic cell connector especially in such a manner that this leads to a total reflection at the glass/air interface of a photovoltaic module.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein the patterning takes place by means of a forming die which is impressed into the at least one part of the solder-covered surface of the photovoltaic cell connector.

### Claim 3 (depends on 2)

The method as claimed in claim 2, wherein the forming die is impressed into the at least one part of the photovoltaic cell connector whilst the at least one part of the photovoltaic cell connector cools off.

### Claim 4 (depends on 1)

The method as claimed in claim 1, wherein the electrical bonding takes place by means of a soldering process.

### Claim 5 (depends on 1)

The method as claimed in claim 1, wherein the patterning takes place by means of pressing a forming die into the surface of the heated part of the photovoltaic cell connector.

### Claim 6 (depends on 1)

The method as claimed in claim 1, wherein the layer thickness of the solder material forming a solder layer is at least so great that the forming pattern of the forming die is completely accommodated by the solder layer.

### Claim 7 (depends on 1)

The method as claimed in claim 1, wherein the predetermined surface patterns are greater than the wavelength of the light converted into electric current by the photovoltaic cell.