Eur. Phys. J. Appl. Phys.
Volume 37, Number 3, March 2007
|Page(s)||261 - 264|
|Section||Semiconductors and Related Materials|
|Published online||22 February 2007|
Contacts for semitransparent organic solar cells*
Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg, Industriestraße 6, 70565 Stuttgart, Germany
Corresponding author: firstname.lastname@example.org
Revised: 18 January 2007
Accepted: 24 January 2007
Published online: 22 February 2007
The optical absorption in organic solar cells, and hence their efficiency to convert sunlight into electricity, is limited by both a confined spectral absorption range and the very thin active layers which are required since polymers have short charge carrier diffusion lengths. We propose to make the most of this apparent 'drawback' by using transparent contacts on both sides of the diode, leading to brilliant red-coloured semitransparent solar cells. Such cells are interesting for new, aesthetically appealing applications where coloured glasses or foils with the additional benefit of providing electric power are desired. Maybe even more importantly – such semitransparent solar cells are essential for mechanically stacked tandem arrays where two subcells are combined. We investigated different cathodes based on Al-doped ZnO and thin LiF and Al layers. Apparently, the different cathode layer preparation conditions strongly influence the cell performance. Our standard LiF/Al cells do not usually require annealing for improved efficiencies, in contrast to cells with sputtered cathodes. For the latter, a thermal post-treatment can greatly enhance the performance, depending on the sputtering process. We could demonstrate power conversion efficiencies of up to 3.4% for single cells and up to 4.2% for stacked tandem arrays.
PACS: 72.40.+w – Photoconduction and photovoltaic effects / 84.60.Jt – Photovoltaic conversion / 72.80.Le – Polymers, organic compounds / 82.35.Cd – Conductive polymers / 81.05.Tp – Fullerenes and related materials / 81.15.Cd – Deposition by sputtering
© EDP Sciences, 2007
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.