Photophysics and morphology of poly (3-dodecylthienylenevinylene)-[6,6]-phenyl-C{sub 61}-butyric acid methyl ester composite

Journal Article · Mon May 21 00:00:00 EDT 2012 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4720091· OSTI ID:22025566

Lafalce, E; Toglia, P; Jiang, X ^[1]; Zhang, C ^[2]

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1. Department of Physics, University of South Florida, Tampa, Florida 33620 (United States)
2. Department of Chemistry and Biochemistry, South Dakota State University, Brookings, South Dakota 57007 (United States)

A series of low band gap poly(3-dodecylthienylenevinylene) (PTV) with controlled morphological order have been synthesized and blended with the electron acceptor [6,6]-phenyl-C{sub 61}-butyric acid methyl ester (PCBM) for organic photovoltaic devices. Two polymers with the most and least side chain regioregularity were chosen in this work, namely the PTV010 and PTV55, respectively. Using photoluminescence, photo-induced absorption spectroscopy, and atomic force microscopy, we find no direct evidence of photoinduced charge transfer between the two constituents, independent of the bulk-heterojunction morphology of the film, although the possibility of formation of P{sup +}/C{sub 60}{sup -} charge transfer complex was not completely ruled out. The large exciton binding energy (E{sub b} = 0.6 eV) in PTV inhibits the photoinduced electron transfer from PTV to PCBM. In addition, excitons formed on polymer chains suffer ultrafast (

• OSTI ID: 22025566
• Journal Information: Applied Physics Letters, Vol. 100, Issue 21; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
ATOMIC FORCE MICROSCOPY
BINDING ENERGY
BUTYRIC ACID
CHARGE EXCHANGE
COMPOSITE MATERIALS
ENERGY GAP
ENERGY TRANSFER
ESTERS
EV RANGE
EXCITATION
EXCITONS
FULLERENES
HETEROJUNCTIONS
MORPHOLOGY
PHOTOLUMINESCENCE
PHOTOVOLTAIC EFFECT
THIN FILMS