NDLI: 20% Efficient screen-printed and aluminum-alloyed back-contact back-junction cells and interconnection scheme of point-shaped metalized cells

Content Provider	IEEE Xplore Digital Library
Author	Woehl, R. Keding, R. Rudiger, M. Gentischer, H. Clement, F. Wilde, J. Biro, D.
Copyright Year	2011
Description	Author affiliation: Department of Microsystem Engineering (IMTEK), University of Freiburg, Germany (Wilde, J.) \|\| Fraunhofer Institute for Solar Energy Systems (ISE), Freiburg, Germany (Woehl, R.; Keding, R.; Rudiger, M.; Clement, F.; Biro, D.)
Abstract	A back-contact back-junction silicon solar cell is presented that was exclusively structured and metalized by screen-printing technology. On n-type base material the emitter was formed by locally printed and alloyed aluminum structures in a co-firing process. By a varying emitter coverage on the rear the influence on the collection probability and thus the short-circuit current density is analyzed by light beam induced current (LBIC) measurements. Efficiencies of up to 20% were realized and independently confirmed by Fraunhofer ISE CalLab. Two-dimensional simulations of the cell structure are performed and agree well with the processed cell. Variations of several parameters show room for further efficiency increase. Furthermore a new module concept for back-contact cells is presented where the metallization on cell level is point-shaped. The lateral conductance of collected carriers is enabled on module level by a structured printed circuit board. On the contacts an adhesive agent is screen-printed in order to make the aluminum contacts solderable. Afterwards a soldering paste is screen-printed which connects the cell and the printed circuit board or foil during a reflow process. This concept overcomes the restriction in cell size of back-contact back-junction modules due to thick copper layer.
Starting Page	000048
Ending Page	000052
File Size	1279882
Page Count	5
File Format	PDF
ISBN	9781424499663
ISSN	01608371
e-ISBN	9781424499656
DOI	10.1109/PVSC.2011.6185843
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Silicon Photovoltaic cells Copper Temperature measurement Aluminum Transmission line measurements
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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