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Photocurrent Spectra and Fast Kinetic Studies of P3HT/PCBM Mixed with a Dye for Photoconversion in the Near-IR Region
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics I.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics I.
2009 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 113, no 7, 3014-3020 p.Article in journal (Refereed) Published
Abstract [en]

Photoconversion properties are demonstrated for a device based on a small dye molecule, absorbing light in the near-IR region, mixed with two organic charge transport materials and together forming a dye-sensitized organic bulk heterojunction. The organic dye molecule, phthalocyanine (1,4,8,11,15,18,22,25-octabutoxy-29H,31H-phthalocyanine), mixed with a blend of poly(3-hexylthiophene) (P3HT) and 1-(3-methoxycarbonyl)-propyl-1-phenyl-(6,6)C-61 (PCBM), shows a photoconversion spectrum extended more than 150 nm toward longer wavelengths, as compared to a device without such dye sensitization. In the dye-sensitized region of the photoconversion spectrum the maximum infernal quantum efficiency was estimated to 40%. With higher dye concentrations the internal quantum efficiency decreases. Transient laser spectroscopy measurements show that after excitation of the dye there is an electron transfer from the dye to PCBM and a subsequent hole transfer from the dye to P3HT, which results in a long-lived (P3HT(+)/dye/PCBM-) charge-separated state.

Place, publisher, year, edition, pages
2009. Vol. 113, no 7, 3014-3020 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-137322DOI: 10.1021/jp808610fISI: 000263299600051OAI: oai:DiVA.org:uu-137322DiVA: diva2:378202
Available from: 2010-12-15 Created: 2010-12-15 Last updated: 2017-12-11Bibliographically approved

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Rensmo, Håkan

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