Photovoltaic properties dependance on the active layer morphology of small molecule organic solar cells

Roshanak Radbeh; Bernard Ratier; Wassim Hojeij; Benoit Brousse; André Moliton

doi:10.1117/12.663120

20 April 2006 Photovoltaic properties dependance on the active layer morphology of small molecule organic solar cells

Roshanak Radbeh, Bernard Ratier, Wassim Hojeij, Benoit Brousse, André Moliton

Proceedings Volume 6192, Organic Optoelectronics and Photonics II; 619223 (2006) https://doi.org/10.1117/12.663120
Event: SPIE Photonics Europe, 2006, Strasbourg, France

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.

Citation Download Citation

Roshanak Radbeh, Bernard Ratier, Wassim Hojeij, Benoit Brousse, and André Moliton "Photovoltaic properties dependance on the active layer morphology of small molecule organic solar cells", Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 619223 (20 April 2006); https://doi.org/10.1117/12.663120

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