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Picosecond Transient Photoconductivity in a Soluble Derivative of Poly(p-phenylene vinylene)

Cited 15 time in Web of Science Cited 16 time in Scopus
Authors
Lee, Changhee; Yu, G.; Sariciftci, N. S.; Heeger, A. J.; Zhang, C.
Issue Date
1995
Publisher
Elsevier
Citation
Synth. Met. 75 (1995) 127
Keywords
PhotoconductivityLuminescencePoly(p-phenylene vinylene)
Abstract
We report the results of picosecond transient photoconductivity (PC) measurements in films of poly[2-methoxy-5-(2′-ethyl-hexyloxy)-p-phenylene vinylene] (MEH-PPV), a soluble derivative of poly(p-phenylene vinylene) (PPV). The onset of picosecond transient PC and the onset of steady-state PC are both found to coincide with that of optical absorption. The peak transient PC is proportional to the electric field, independent of temperature, and proportional to the light intensity. Since the transient PC is an order of magnitude smaller than that of PPV, early recombination is more probable due to the large side groups of MEH-PPV. This has been checked through photoinduced charge-transfer studies; both the magnitude and lifetime of the transient PC increase substantially on addition of dilute concentrations of C60 into MEH-PPV. Thus, ultrafast photoinduced electron transfer reduces early recombination and enhances the quantum yield for photogeneration of free charge carriers. These results indicate direct photogeneration of free carriers via an interband transition.
ISSN
0379-6779
Language
English
URI
http://hdl.handle.net/10371/13727
DOI
https://doi.org/10.1016/0379-6779(95)03404-8
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Journal Papers (저널논문_전기·정보공학부)
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