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Laser patterning of P2 interconnect via in thin-film CIGS PV modules
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics. (Ångström Solar Center)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics. (Ångström Solar Center)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics. (Ångström Solar Center)
2008 (English)In: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 92, no 10, 1230-1235 p.Article in journal (Refereed) Published
Abstract [en]

The use of laser scribed Cu(In,Ga)Se2 as a high-speed and low-stress alternative to the standard mechanical scribing has been investigated for thin-film PV modules on glass substrates. Laser scribe lines were smooth, narrow and straight compared to the chipped and jagged mechanically scribed lines. Modules fabricated using laser patterning have reached a 15% module efficiency and fill factors as high as 73%. Contact resistances were found to be in the range of 0.1 Ω cm for standard scribing and 0.4 Ω cm for the laser-formed contacts. In spite of the elevated contact resistance performance is comparable to conventionally processed modules and dry heat stability tests are encouraging.

Place, publisher, year, edition, pages
2008. Vol. 92, no 10, 1230-1235 p.
Keyword [en]
Laser Patterning, PV Modules, CIGS, Laser
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electronics
Identifiers
URN: urn:nbn:se:uu:diva-88193DOI: 10.1016/j.solmat.2008.04.015ISI: 000258431300010OAI: oai:DiVA.org:uu-88193DiVA: diva2:139551
Projects
Thin film solar cellsSolibro Research AB
Available from: 2009-01-23 Created: 2009-01-23 Last updated: 2016-04-13
In thesis
1. By Means of Beams: Laser Patterning and Stability in CIGS Thin Film Photovoltaics
Open this publication in new window or tab >>By Means of Beams: Laser Patterning and Stability in CIGS Thin Film Photovoltaics
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Solar irradiation is a vast and plentiful source of energy. The use of photovoltaic (PV) devices to convert solar energy directly to electrical energy is an elegant way of sustainable power generation which can be distributed or in large PV plants based on the need. Solar cells are the small building blocks of photovoltaics and when connected together they form PV modules. Thin film solar cells require significantly less energy and raw materials to be produced, as compared to the dominant Si wafer technologies. CIGS thin film solar cells are considered to be the most promising thin film alternative due to its proven high efficiency.

Most thin film PV modules utilise monolithic integration, whereby thin film patterning steps are included between film deposition steps, to create interconnection of individual cells within the layered structure. The state of the art is that CIGS thin film modules are made using one laser patterning step (P1) and two mechanical patterning steps (P2 and P3). Here we present work which successfully demonstrates the replacement of mechanical patterning by laser patterning methods. The use of laser ablation promises such advantages as increased active cell area and reduced maintenance and downtime required for regular replacement of mechanical tools.

The laser tool can also be used to transform CIGS into a conducting compound along a patterned line. We have shown that this process can be performed after all semiconductor layers are deposited using a technique we call laser micro-welding. By performing patterning at the end of the process flow P2 and P3 patterning could be performed simultaneously. Such solutions will further reduce manufacturing times and may offer increased control of semiconductor interfaces.

While showing promising performance on par with reference processes there are still open questions of importance for these novel techniques, particularly that of long term stability. Thin film modules are inherently sensitive to moisture and require reliable encapsulation. Before the techniques introduced here can be seen industrially they must have achieved proven stability. In this work we present a proof of existence of stable micro-welded interconnections.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2011. 98 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 801
Keyword
Laser patterning, laser ablation, laser micro-welding, stability, Cu(InGa)Se2, CIGS, thin film solar cells, thin film photovoltaics, module technology, solar energy
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Electronics
Identifiers
urn:nbn:se:uu:diva-143154 (URN)978-91-554-7988-6 (ISBN)
Public defence
2011-03-04, Å4001, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:30 (English)
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Note
Felaktigt tryckt som Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 731Available from: 2011-02-10 Created: 2011-01-19 Last updated: 2011-03-21Bibliographically approved

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Westin, Per-OskarZimmermann, UweEdoff, Marika

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