Issue |
EPJ Photovolt.
Volume 6, 2015
|
|
---|---|---|
Article Number | 60501 | |
Number of page(s) | 6 | |
Section | High Efficiency Materials and Devices - New concepts | |
DOI | https://doi.org/10.1051/epjpv/2015001 | |
Published online | 09 March 2015 |
https://doi.org/10.1051/epjpv/2015001
Highly transparent front electrodes with metal fingers for p-i-n thin-film silicon solar cells
1
Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of
Microengineering (IMT), Photovoltaics and Thin-Film Electronics
Laboratory, Rue de la Maladière
71b, 2000
Neuchâtel,
Switzerland
2
IEK5-Photovoltaik, Forschungszentrum Jülich GmbH,
52425
Jülich,
Germany
a e-mail: etienneantoine.moulin@epfl.ch
Received:
23
October
2014
Received in final form:
12
January
2015
Accepted:
15
January
2015
Published online:
9
March
2015
The optical and electrical properties of transparent conductive oxides (TCOs), traditionally used in thin-film silicon (TF-Si) solar cells as front-electrode materials, are interlinked, such that an increase in TCO transparency is generally achieved at the cost of reduced lateral conductance. Combining a highly transparent TCO front electrode of moderate conductance with metal fingers to support charge collection is a well-established technique in wafer-based technologies or for TF-Si solar cells in the substrate (n-i-p) configuration. Here, we extend this concept to TF-Si solar cells in the superstrate (p-i-n) configuration. The metal fingers are used in conjunction with a millimeter-scale textured foil, attached to the glass superstrate, which provides an antireflective and retroreflective effect; the latter effect mitigates the shadowing losses induced by the metal fingers. As a result, a substantial increase in power conversion efficiency, from 8.7% to 9.1%, is achieved for 1-μm-thick microcrystalline silicon solar cells deposited on a highly transparent thermally treated aluminum-doped zinc oxide layer combined with silver fingers, compared to cells deposited on a state-of-the-art zinc oxide layer.
© Moulin et al., published by EDP Sciences, 2015
This is an Open Access article distributed under the terms of the Creative
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