Space-charge formation in thick MDMO-PPV:PCBM solar cells

M. Lenes; V. D. Mihailetchi; L. J. A. Koster; P. W. M. Blom

doi:10.1117/12.664957

20 April 2006 Space-charge formation in thick MDMO-PPV:PCBM solar cells

M. Lenes, V. D. Mihailetchi, L. J. A. Koster, P. W. M. Blom

Proceedings Volume 6192, Organic Optoelectronics and Photonics II; 61922E (2006) https://doi.org/10.1117/12.664957
Event: SPIE Photonics Europe, 2006, Strasbourg, France

Abstract

One of the most studied systems in the field of organic photovoltaic devices are bulk heterojunction solar cells based on poly[2-methoxy-5-(3',7'-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) as electron donor and methano[60] fullerene [6,6]-phenyl C61 butyric acid methyl ester (PCBM) as electron acceptor. A striking feature of these types of solar cells is that at the optimal device thickness of typically 100 nm only 60% of the incident light is absorbed. It is evident that the absorption can be enhanced by increasing the thickness of the active layer. However, in spite of an increased absorption the overall power conversion efficiency shows a negative trend when increasing the device thickness beyond 100nm. From device point of view the reduced performance with increasing thickness mainly originates from a decrease of the fill factor. We demonstrate that this fill factor decrease is a result of the formation of space-charges in thick devices and charge recombination.

Citation Download Citation

M. Lenes, V. D. Mihailetchi, L. J. A. Koster, and P. W. M. Blom "Space-charge formation in thick MDMO-PPV:PCBM solar cells", Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 61922E (20 April 2006); https://doi.org/10.1117/12.664957

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