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Absence of Photoinduced Electron-Transfer from the Excitonic Electron-Hole Bound-State in Polydiacetylene Conjugated Polymers

Cited 32 time in Web of Science Cited 31 time in Scopus
Authors
Sariciftci, N. S.; Kraabel, B.; Lee, Changhee; Pakbaz, K.; Heeger, A. J.; Sandman, D. J.
Issue Date
1994-10-15
Publisher
The American Physical Society
Citation
Phys. Rev. B 50, 12044
Abstract
We present the results of comparative studies of photoinduced electron transfer from semiconducting polymers onto C60, focusing on the effect of strong Coulomb correlations, which lead to excitons (bound electron-hole pairs) as the primary photoexcitations. For this purpose, we investigated two different soluble polydiacetylene (PDA) derivatives in which the lowest-energy photoexcitations are excitons with a binding energy of approximately 0.5 eV. The experimental studies (absorption and emission spectroscopy, subpicosecond and millisecond photoinduced absorption spectroscopy, and picosecond transient and near-steady-state photoconductivity) were carried out in pristine materials and in composites of PDA with C60. The PDA data are compared with the results of similar studies on semiconducting conjugated polymers such as poly(para-phenylene-vinylene) and its derivatives, the PPV’s, and polythiophene and its derivatives, the P3AT’s. The results show clearly that in contrast to the high quantum efficiency photoinduced electron transfer discovered earlier in the PPV’s and the P3AT’s, the excitonic bound state of the electron and hole inhibits photoinduced electron transfer from PDA onto C60. We conclude that in the PPV’s and the P3AT’s, the Coulomb interaction is sufficiently well screened that upon photoexcitation free carriers are created, thereby making possible facile electron transfer to a nearby acceptor.
ISSN
1098-0121
Language
English
URI
http://hdl.handle.net/10371/13609
DOI
https://doi.org/10.1103/PhysRevB.50.12044
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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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