All sub-nanosecond laser monolithic interconnection of OPV modules

Journal article
(Original article)

Publication Details

Author(s): Kubis P, Winter J, Gavrilova A, Hennel M, Schlosser S, Richter I, Distler A, Heyder M, Kery S, Lenk P, Geiger S, Brabec C, Huber HP, Egelhaaf HJA
Journal: Progress in Photovoltaics: Research and Applications
Publisher: John Wiley and Sons Ltd
Publication year: 2019
ISSN: 1099-159X
Language: English


Although green femtosecond lasers provide outstanding quality and wide processing
windows for monolithic interconnection of the individual cells in organic photovoltaic
(OPV) modules, they are hardly used in commercial applications, due to cost reasons.
In this work, a process has been developed that allows the monolithic interconnection
in OPV modules with an infrared sub‐nanosecond laser exclusively, without
compromising the performance of the modules. While the photoactive layer is
removed easily by green femtosecond pulses without damaging the bottom electrode,
this is not possible for infrared nanosecond pulses, due to their much larger optical
penetration length, which significantly exceeds the thickness of the active layer and
is well absorbed by the indium tin oxide (ITO) layer. This leads to damage of the
ITO bottom electrode, which in turn compromises the functionality of the module.
By systematically varying single‐pulse laser fluence and spatial pulse overlap, the laser
parameters are optimized in such a way that the contact area between the residues of
the metal oxide bottom electrode and the silver nanowire top electrode is maximized
so that the electrical resistances of the contacts are sufficiently small not to affect
device performance. This is demonstrated by presenting large‐area OPV modules
based on the well‐characterized reference system P3HT:PCBM that show efficiencies
of up to 2.4%. This achievement opens up the way towards reliable roll‐to‐roll
(R2R) laser patterning processes with sub‐nanosecond lasers and thus represents a
breakthrough with respect to cost‐effective R2R manufacturing of OPV modules,
due to grossly reduced investment and maintenance costs for laser sources.

FAU Authors / FAU Editors

Brabec, Christoph Prof. Dr.
Institute Materials for Electronics and Energy Technology (i-MEET)
Egelhaaf, Hans-Joachim Albert
Institute Materials for Electronics and Energy Technology (i-MEET)

External institutions with authors

Bayerisches Zentrum für Angewandte Energieforschung e.V. (ZAE Bayern)
Hochschule für angewandte Wissenschaften München
InnoLas Holding GmbH
LS Laser Systems GmbH

Research Fields

Neue Materialien und Prozesse
Research focus area of a faculty: Technische Fakultät

How to cite

Kubis, P., Winter, J., Gavrilova, A., Hennel, M., Schlosser, S., Richter, I.,... Egelhaaf, H.-J.A. (2019). All sub-nanosecond laser monolithic interconnection of OPV modules. Progress in Photovoltaics: Research and Applications.

Kubis, Peter, et al. "All sub-nanosecond laser monolithic interconnection of OPV modules." Progress in Photovoltaics: Research and Applications (2019).


Last updated on 2019-04-06 at 07:56