Interconnection of busbar-free back contacted solar cells by laser welding

verfasst von

Henning Schulte-Huxel, Susanne Blankemeyer, Agnes Merkle, Verena Steckenreiter, Sarah Kajari-Schröder, Rolf Brendel

Abstract

We are presenting the module integration of busbar-free back-junction back-contact (BJBC) solar cells. Our proof-of-concept module has a fill factor of 80.5% and a conversion efficiency on the designated area of 22.1% prior to lamination. A pulsed laser welds the Al metallization of the solar cells to an Al foil carried by a transparent substrate. The weld spots electrically contact each individual finger to the Al foil, which serves as interconnect between different cells. We produce a proof-of-concept module using busbar-free cell strips of 25 × 125 mm². These are obtained by laser-dicing of a 125 × 125 mm² BJBC solar cell. The fill factor of this module is increased by 3.5% absolute compared with the initial cell before laser-dicing. This is achieved mainly by omitting the busbars and reduction of the finger length. The improvement of the module fill factor results in an increase in the module performance of 0.9% absolute before lamination in comparison with the efficiency of the initial 125 × 125 mm² BJBC solar cell. Hence, this interconnection scheme enables the transfer of high cell efficiencies to the module.

Organisationseinheit(en)

Institut für Festkörperphysik

Externe Organisation(en)

Institut für Solarenergieforschung GmbH (ISFH)

Typ

Artikel

Journal

Progress in Photovoltaics: Research and Applications

Band

23

Seiten

1057-1065

Anzahl der Seiten

9

ISSN

1062-7995

Publikationsdatum

29.05.2014

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Elektronische, optische und magnetische Materialien, Erneuerbare Energien, Nachhaltigkeit und Umwelt, Physik der kondensierten Materie, Elektrotechnik und Elektronik

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1002/pip.2514 (Zugang: Geschlossen)
https://doi.org/10.1002/pip.2647 (Zugang: Offen)