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By Means of Beams : Laser Patterning and Stability in CIGS Thin Film Photovoltaics
info:eu-repo/semantics/openAccess ;ISBN: 915547988X ;ISBN: 9789155479886
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Title:
By Means of Beams : Laser Patterning and Stability in CIGS Thin Film Photovoltaics
Author:
Westin, Per-Oskar
Subjects:
Annan elektroteknik och elektronik
;
CIGS
;
Cu(InGa)Se2
;
laser ablation
;
laser micro-welding
;
Laser patterning
;
module technology
;
Other Electrical Engineering, Electronic Engineering, Information Engineering
;
solar energy
;
stability
;
thin film photovoltaics
;
thin film solar cells
Description:
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. Felaktigt tryckt som Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 731
Publisher:
Uppsala : Acta Universitatis Upsaliensis
Creation Date:
2011
Language:
English
Identifier:
ISBN: 915547988X
ISBN: 9789155479886
Source:
Uppsala University DiVA
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