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Proceedings Paper

Functional substrates for flexible organic photovoltaic cells
Author(s): M. Niggemann; D. Ruf; B. Bläsi; M. Glatthaar; M. Riede; C. Müller; B. Zimmermann; A. Gombert
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Paper Abstract

Along with efficiency and lifetime, costs are one of the most important aspects for the commercialization of organic solar cells. Thinking of large scale production of organic solar cells by an efficient reel-to-reel process, the materials are expected to determine the costs of the final product. Our approach is to develop functional substrates for organic solar cells which have the potential for cost effective production. The functionality is obtained by combining periodically microstructured substrates with lamellar electrode structures. Such structured substrates were fabricated by cost effective replication from masterstructures that were generated by large area interference lithography. Two cell architectures were investigated - holographic microprisms and interdigital buried nanoelectrodes. A structure period of 20 μm in combination with a 2 μm wide metal grid was chosen for the microprism cells based on the results of electrical calculations. Current-voltage curves with reasonable fill factors were measured for these devices. A significant light trapping effect was predicted from optical simulations. Interdigital buried nanoelectrodes are embedded in the photoactive layer of the solar cell. Separated interdigital metal electrodes with a sufficiently high parallel resistance were manufactured despite a small electrode distance below 400 nm. Experimental results on first photovoltaic devices will be presented. We observe an insufficient rectification of the photovoltaic device which we attribute to partial electron injection into the gold anode.

Paper Details

Date Published: 4 October 2005
PDF: 9 pages
Proc. SPIE 5938, Organic Photovoltaics VI, 593802 (4 October 2005); doi: 10.1117/12.617196
Show Author Affiliations
M. Niggemann, Fraunhofer Institute for Solar Energy Systems (Germany)
Material Research Ctr. Freiburg (Germany)
D. Ruf, Fraunhofer Institute for Solar Energy Systems (Germany)
B. Bläsi, Fraunhofer Institute for Solar Energy Systems (Germany)
M. Glatthaar, Material Research Ctr. Freiburg (Germany)
M. Riede, Fraunhofer Institute for Solar Energy Systems (Germany)
C. Müller, Institute for Microsystem Technology (Germany)
B. Zimmermann, Material Research Ctr. Freiburg (Germany)
A. Gombert, Fraunhofer Institute for Solar Energy Systems (Germany)


Published in SPIE Proceedings Vol. 5938:
Organic Photovoltaics VI
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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