Al-Foil on Encapsulant for the Interconnection of Al-Metalized Silicon Solar Cells

verfasst von

Henning Schulte-Huxel, Susanne Blankemeyer, Robert Bock, Agnes Merkle, Sarah Kajari-Schröder, Rolf Brendel

Abstract

We demonstrate the interconnection of silicon solar cells with evaporated aluminum back contacts using an aluminum foil which is attached to a silicone encapsulant. The aluminum-based mechanical and electrical laser interconnection (AMELI) process forms laser weld spots using single laser pulses. These laser welds resist high mechanical stresses and have a low electrical contact resistivity. No solder, conductive adhesives, or Ag-pastes are required for interconnection. We find the electrical contact resistivity to be below ρ _c = 0.01 mΩ·cm². The contact resistance is constant under accelerated aging of 300 humidity-freeze cycles. With a tensile testing machine, we measure tear-off stresses in the perpendicular direction of up to 380 kPa for our laser weld spots. We present a proof-of-concept module which consists of five n-type back-junction back-contact solar cells with a conversion efficiency of 20.4%. The unchanged fill factor FF and open circuit voltage V_{\rm oc} verify a damage-and loss-free interconnection which is supported by electroluminescence measurements.

Organisationseinheit(en)

Abt. Solarenergie

Externe Organisation(en)

Institut für Solarenergieforschung GmbH (ISFH)
Bosch Solar Energy AG

Typ

Artikel

Journal

IEEE journal of photovoltaics

Band

3

Seiten

77-82

Anzahl der Seiten

6

ISSN

2156-3381

Publikationsdatum

09.08.2012

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Elektronische, optische und magnetische Materialien, Physik der kondensierten Materie, Elektrotechnik und Elektronik

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1109/JPHOTOV.2012.2208096 (Zugang: Geschlossen)