Mechanism of Degradation and Improvement of Stability on Mesogenic-Phthalocyanine-Based Bulk Heterojunction Solar Cell

The stability of bulk heterojunction organic solar cells utilizing the phthalocyanine derivative 1,4,8,11,15,18,22,25-octahexylphthalocyanine (C6PcH 2 ) and the fullerene derivative 1-(3-methoxy-carbonyl)-propyl-1-1-phenyl-(6,6)C61 has been studied. In the same environment, C6PcH 2 -based cells have...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2013-01, Vol.52 (1), p.012301-012301-5
Main Authors: Dao, Quang Duy, Hori, Tetsuro, Masuda, Tetsuya, Fukumura, Kaoru, Kamikado, Toshiya, Nekelson, Fabien, Fujii, Akihiko, Shimizu, Yo, Ozaki, Masanori
Format: Article
Language:English
Subjects:
Buckminsterfullerene
Degradation
Derivatives
Diffusion
Fullerenes
Photovoltaic cells
Solar cells
Stability
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Summary:The stability of bulk heterojunction organic solar cells utilizing the phthalocyanine derivative 1,4,8,11,15,18,22,25-octahexylphthalocyanine (C6PcH 2 ) and the fullerene derivative 1-(3-methoxy-carbonyl)-propyl-1-1-phenyl-(6,6)C61 has been studied. In the same environment, C6PcH 2 -based cells have shown higher stability than the cells fabricated using the conventional donor material poly(3-hexylthiophene). Furthermore, the degradation mechanisms of these solar cells have been investigated. It was found that the chemical bonds of two pyrrole aza nitrogens as well as the four mesobridging aza nitrogens with neighboring carbons in the C6PcH 2 molecule were broken after irradiation with a solar simulator, which affected the device lifetime. To improve the stability, various buffer layers have been deposited between the counterelectrode and the active layer. Obviously, the C 60 thin film and the oxidized layer play an important role as blocking layers that prevent the diffusion of metal atoms into the active layer, resulting in the higher stability.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.52.012301