Volume 6, 2015
|Number of page(s)||6|
|Section||High Efficiency Materials and Devices - New concepts|
|Published online||09 March 2015|
Highly transparent front electrodes with metal fingers for p-i-n thin-film silicon solar cells
Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of
Microengineering (IMT), Photovoltaics and Thin-Film Electronics
Laboratory, Rue de la Maladière
2 IEK5-Photovoltaik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
a e-mail: firstname.lastname@example.org
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 Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.