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Materials 2017, 10(4), 392; doi:10.3390/ma10040392

Optical Design of Textured Thin-Film CIGS Solar Cells with Nearly-Invisible Nanowire Assisted Front Contacts

1
TNO/Solliance, High Tech Campus 21, 5656 AE Eindhoven, The Netherlands
2
TNO/Holst, High Tech Campus 31, 5656 AE Eindhoven, The Netherlands
*
Author to whom correspondence should be addressed.
Received: 7 February 2017 / Revised: 4 April 2017 / Accepted: 4 April 2017 / Published: 7 April 2017
(This article belongs to the Special Issue Advances in Transparent Conducting Materials)
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Abstract

The conductivity of transparent front contacts can be improved by patterned metallic nanowires, albeit at the cost of optical loss. The associated optical penalty can be strongly reduced by texturization of the cell stack. Remarkably, the nanowires themselves are not textured and not covered in our design. This was shown by optical modeling where the width of the nanowire, the texture height and the texture period were varied in order to obtain a good insight into the general trends. The optical performance can be improved dramatically as the reflection, which is the largest optical loss, can be reduced by 95% of the original value. The spectra reveal absorption in the Cu(In,Ga)Se2 (CIGS) layer of 95% and reflection below 2% over a large part of the spectrum. In essence, a virtually black CIGS cell stack can be achieved for textured cells with a metal nanogrid. Moreover, it turned out that the ratio between the width of the nanowire and the height of the texture is a critical parameter for optical losses. View Full-Text
Keywords: solar cells; nanogrid; thin-film solar; front contact solar cells; nanogrid; thin-film solar; front contact
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Deelen, J.V.; Omar, A.; Barink, M. Optical Design of Textured Thin-Film CIGS Solar Cells with Nearly-Invisible Nanowire Assisted Front Contacts. Materials 2017, 10, 392.

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