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Proceedings Paper

Photovoltaic properties dependance on the active layer morphology of small molecule organic solar cells
Author(s): Roshanak Radbeh; Bernard Ratier; Wassim Hojeij; Benoit Brousse; André Moliton
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Paper Abstract

The active layer morphology of vacuum deposited organic solar cells based on phthalocyanine-perylene donor-acceptor couple have been studied, comparing coevaporated bulk heterojunction with multilayer structures consisting in alternated donor and acceptor very thin layers. These latter devices show current-voltage behaviour indicating that their active layer acts as an interpenetrated network. They show better photovoltaic parameters, with power conversion efficiencies 2.5 time higher than the bulk heterojunctions, and better external quantum efficiencies. A compromise with vacuum evaporation growth rate has to be taken in order to realize the multilayer solar cells: high growth rate produces a better bulk interpenetrated structure giving rise to a better external quantum efficiency, but low growth rate favours the planar molecular arrangement that gives a better absorption of the perylene molecules. From the comparison between measurements held in open air and under dry nitrogen atmosphere, we think that multilayer solar cells seem to be far less sensible to open air condition than the coevaporated solar cells.

Paper Details

Date Published: 20 April 2006
PDF: 10 pages
Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 619223 (20 April 2006); doi: 10.1117/12.663120
Show Author Affiliations
Roshanak Radbeh, Univ. de Limoges, CNRS (France)
Bernard Ratier, Univ. de Limoges, CNRS (France)
Wassim Hojeij, Univ. de Limoges, CNRS (France)
Benoit Brousse, Univ. de Limoges, CNRS (France)
CEA Saclay, DSM, DRECAM, SPCSI (France)
André Moliton, Univ. de Limoges, CNRS (France)


Published in SPIE Proceedings Vol. 6192:
Organic Optoelectronics and Photonics II
Paul L. Heremans; Michele Muccini; Eric A. Meulenkamp, Editor(s)

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