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Protocrystalline Silicon for Micromorph Tandem Cells on Gen. 5 Size

Published online by Cambridge University Press:  01 February 2011

Gijs van Elzakker ,
Daniel Sixtensson ,
Niklas Papathanasiou ,
Klaus Neubeck  and
Roland Sillmann
Gijs van Elzakker
Affiliation:
gijs.vanelzakker@inventux.com, Inventux Technologies AG, Berlin, Germany
Daniel Sixtensson
Affiliation:
daniel.sixtensson@inventux.com, Inventux Technologies AG, Berlin, Germany
Niklas Papathanasiou
Affiliation:
niklas.papathanasiou@inventux.com, Inventux Technologies AG, Berlin, Germany
Klaus Neubeck
Affiliation:
klaus.neubeck@inventux.com, Inventux Technologies AG, Berlin, Germany
Roland Sillmann
Affiliation:
roland.sillmann@inventux.com, Inventux Technologies AG, Berlin, Germany
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Abstract

Inventux Technologies AG is a high volume producer of Micromorph (a-Si:H/μc-Si:H) tandem modules. The light-induced degradation of hydrogenated amorphous silicon (a-Si:H), called Staebler-Wronski effect (SWE), limits the stabilized efficiency of a-Si:H-based solar cells. Several laboratories have reported on the development of a-Si:H with increased resistance against light-soaking. This so-called ‘protocrystalline' silicon can be grown with plasma-enhanced chemical vapor deposition (PECVD) by diluting the silane source gas with hydrogen.

The aim of the work presented in this paper was to scale-up the laboratory results on protocrystalline silicon to a size of 1.43 m2 (Gen. 5) using a process that is suitable for high volume production. We demonstrate that the strict boundary conditions regarding uniformity and growth rate, which are necessary for a production process, can be met. The reduced light-induced degradation of protocrystalline solar cells fabricated with the newly developed process is confirmed by a light-soaking experiment. As an outlook towards future work, we discuss issues related to the implementation of a protocrystalline top cell in the Micromorph tandem configuration. The challenge of choosing the right top-cell thickness is illustrated by experimental results on two tandem cells. The top cells of these tandems contain protocrystalline i-layers of different thicknesses.

Keywords

thin filmplasma-enhanced CVD (PECVD) (deposition)photovoltaic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1245: Symposium A – Amorphous and Polycrystalline Thin-Film Silicon Science and Technology-2010 , 2010 , 1245-A01-03
Copyright
Copyright © Materials Research Society 2010

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References

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