Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Florian Clement

Oliver Schultz-Wittmann

Daniel Biro

Ralf Preu

Benjamin Thaidigsmann

Michael Linse

Maximilian Pospischil

Sebastian Tepner

Andreas Lorenz

Linda Ney

Andreas Wolf

Andreas Brand

Nico Wöhrle

Marius Singler

Pierre Saint-Cast

Tobias Fellmeth

Puzant Baliozian

Elmar Lohmüller

Edgar-Allan Wotke

Robert Woehl

Daniel Scheffler

Jan Specht

Tim Riebe

Martin Kuchler

Maximilian Weil

Marian BREITENBÜCHER

Katharina Gensowski

Ana Maria Jimenez Cardozo

Markus Klawitter

Harald Gentischer

A printing form for producing a structure of an electronic component, in particular a photovoltaic solar cell, having a screen frame and a screen, which is in the form of a sheet-like textile and has a multiplicity of elongate screen elements. The screen is arranged in the screen frame and the screen has at least one printing region which a printing paste can permeate and at least one barrier region which the printing paste cannot permeate. The elongate screen elements are made from glass fiber, carbon fiber and/or carbon nanotubes.

Printing stencil for producing a structure of an electronic component, in particular of a photovoltaic solar cell, and method for producing a printing stencil of this type

A screen printing form (′) for use in screen printing, in particular for producing a metallic contact structure of a photovoltaic solar cell, having a woven screen printing fabric () with a plurality of elongate woven fabric elements, which are arranged in a first element direction and a second element direction perpendicular thereto, and a stencil (), arranged on the woven screen printing fabric () that has at least one opening formed as straight channel with a channel width BK. The woven fabric elements have a spacing AF in the first element direction and a spacing which deviates by less than 5% from AF in the second element direction, and the woven fabric elements have a diameter DG in the first element direction and a diameter which deviates by less than 5% from DG in the second element direction. A screen printing device and screen printing form are also provided.

Screen printing form for use in a screen printing method, screen printing device, and screen printing method

A a semiconductor component () having a front side and an opposite rear side and also side surfaces, and also at least one emitter () and at least one base (), wherein a pn junction () is formed between emitter () and base () and the emitter () extends parallel to the front and/or rear side. At least one side surface is a passivated separating surface (T), at which a separating surface passivation layer () is arranged, which has stationary charges having a surface charge density at the separating surface (T) with a magnitude of greater than or equal to 10cm-2. A method for singulating a semiconductor component () having a pn junction is also provided.

Semiconductor component and method for singulating a semiconductor component having a pn junction

The invention relates to a method for producing a photovoltaic solar cell having a front side designed for coupling in light, comprising the following method steps: A Producing a plurality of cutouts in a semiconductor substrate of a base doping type, B Producing one or more emitter regions of an emitter doping type at least at the front side of the semiconductor substrate, wherein the emitter doping type is opposite to the base doping type, C Applying an electrically insulating insulation layer and D Producing metallic feed through structures in the cutouts, at least one metallic base contact structure at the rear side of the solar cell, which is formed in an electrically conductive manner with the semiconductor substrate in a base doping region, at least one metallic front-side contact structure at the front side of the solar cell, which is formed in an electrically conductive manner with the emitter region at the front side of the semiconductor substrate, and at least one rear-side contact structure at the rear side of the solar cell, which is formed in a manner electrically conductively connected to the feed through contact structure. The invention is characterized in that in method step B and/or a further method step in addition a feed through emitter region of the emitter doping type extending from the front side to the rear side is formed in each case in the semiconductor substrate on the walls of the cutouts, in that in method step C the insulation layer is applied in a manner covering the rear side of the semiconductor substrate, if appropriate further intervening intermediate layers, in that in method step D the rear-side contact structure is applied to the insulation layer, if appropriate to further intermediate layers, in such a way that the rear-side contact structure extends to regions of the semiconductor substrate having base doping and, in these regions, on account of the intervening insulation layer, an electrical insulation is formed between rear-side contact structure and semiconductor substrate, and the base contact structure is applied to the insulation layer, if appropriate to further intermediate layers, in such a way that the base contact structure penetrates through the insulation layer at least in regions, such that an electrically conductive connection is produced between base contact structure and semiconductor substrate. The invention furthermore relates to a photovoltaic solar cell.

Photovoltaic solar cell and method for producing a photovoltaic solar cell

A method for producing a metallic contact structure for making electrical contact with a photovoltaic solar cell, wherein, in order to create the contact structure, a paste, which contains metal particles, is applied to a surface of a carrier substrate via at least one dispensing opening, wherein the dispensing opening and the carrier substrate are moved in relation to one another during the dispensing of the paste. The paste is circulated in a circulating region, and in each case a part of the paste is branched off out of the circulating region at a plurality of branching points and each branching point is assigned at least one dispensing opening, via which the paste branched off at the branching point is applied to the surface of the carrier substrate, wherein the paste flows through a flow path having a length of less than 1 cm in each case between being branched off out of the circulating region and being dispensed from the dispensing opening assigned to the branching point. A device for producing a metallic contact structure for making electrical contact with a photovoltaic solar cell is also provided.

Method and device for producing a metallic contact structure for making electrical contact with a photovoltaic solar cell

A method for producing a metal contact structure of a photovoltaic solar cell, including: applying an electrically non-conductive insulating layer to a semiconductor substrate, applying a metal contact layer to the insulating layer, and generating a plurality of local electrically conductive connections between the semiconductor substrate and the contact layer right through the insulating layer. The metal contact layer is formed using two pastes containing metal particles: the first paste containing metal particles is applied to local regions, and the second paste containing metal particles is applied covering at least the regions covered with the first paste and partial regions located therebetween. By global heating the semiconductor substrate the first paste penetrates the insulating layer and forms an electrically conductive contact directly with the semiconductor substrate, whereas the second paste does not penetrate the insulating layer and is electrically conductively connected to the semiconductor substrate via the first paste.

Method for producing a metal contact structure of a photovoltaic solar cell

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Freiburg, Germany

Florian Clement