Eur. Phys. J. Appl. Phys.
Volume 44, Number 3, December 2008
|Page(s)||223 - 228|
|Section||Physics of Organic Materials and Devices|
|Published online||24 October 2008|
On the improvement of the efficiency of organic photovoltaic cells by the presence of an ultra-thin metal layer at the interface organic/ITO
Université de Nantes, Nantes Atlantique Universités, LAMP, EA
3825, Faculté des Sciences et des Techniques, 2 rue de la
Houssinière, BP 92208, 44000 Nantes, France
2 Université de Badji-Ammar Annaba, Faculté des Sciences, Algeria
3 Université de Lomé, Togo
Corresponding author: firstname.lastname@example.org
Accepted: 22 August 2008
Published online: 24 October 2008
Organic photovoltaic cells based on the multilayers structure, indium tin oxide (ITO)/copper-phthalocyanine(CuPc)/fullerene(C60)/aluminium tris(8-hydroxyquinoline) (Alq3)/aluminium, have been studied. When an ultra-thin metal layer is deposited onto the surface of the ITO anode the power conversion efficiency of the cells is significantly improved. The improvement depends on the ITO used. These differences have been attributed to the difficulty to control the surface chemistry of ITO. The best result has been obtained with a gold layer thick of about 0.5 nm. We propose that the gold ultra-thin film, which is too thin to be continuous, allows to improve the agreement between the work function of the anode and the highest occupied molecular orbital (HOMO) of the organic donor CuPc and to passivate the surface contamination of ITO.
PACS: 72.80.Le – Polymers; organic compounds / 73.40.-c – Electronic transport in interface structures / 73.50.Pz – Photoconduction and photovoltaic effects / 81.15.Ef – Vacuum deposition
© EDP Sciences, 2008
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