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381 results on '"Sariciftci, N.S."'

103. Oriented organic semiconductor thin films

Author

Andreev, A., primary, Resel, R., additional, Smilgies, D.-M., additional, Hoppe, H., additional, Matt, G., additional, Sitter, H., additional, Sariciftci, N.S., additional, Meissner, D., additional, Plank, H., additional, and Zrzavecka, O., additional

Published
2003
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106. Spectroscopic properties of PEDOTEHIITN

Author

Cravino, A., primary, Loi, M.A., additional, Scharber, M.C., additional, Winder, C., additional, Neugebauer, H., additional, Denk, P., additional, Meng, H., additional, Chen, Y., additional, Wudl, F., additional, and Sariciftci, N.S., additional

Published
2003
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117. Photoinduced electron transfer between conjugated polymers and a homologous series of TCNQ derivatives

Author

Heeger, A.J., Wudl, F., Sariciftci, N.S., Janssen, R.A.J., Martin, N., Heeger, A.J., Wudl, F., Sariciftci, N.S., Janssen, R.A.J., and Martin, N.

Abstract

The results of photoinduced absorption (PIA) and photoluminescence studies of the photoinduced electron transfer reactions from conjugated polymer donors onto a series of acceptors based on TCNQ and benzoquinone derivatives containing fused aromatic rings are summarized. The results are compared to the well-defined photoinduced electron transfer demonstrated from conjugated polymer donors onto buckminsterfullerene, C 60. For the TCNQ derivatives, the efficiency of the electron transfer process correlates with the reduction potential of the acceptors. However, photoinduced electron transfer was not observed in the case of the benzoquinone derivatives, although their electrochemical reduction potentials are similar to C 60.

Published
1996

125. Low band-gap polymeric photovoltaic devices

Author

Shaheen, S.E., primary, Vangeneugden, D., additional, Kiebooms, R., additional, Vanderzande, D., additional, Fromherz, T., additional, Padinger, F., additional, Brabec, C.J., additional, and Sariciftci, N.S., additional

Published
2001
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141. Photoinduced electron transfer from pi-conjugated polymers onto Buckminsterfullerene, fulleroids and methanofullerenes

Author

Janssen, R.A.J., Hummelen, J.C., Lee, Kwanghee, Pakbaz, K., Sariciftci, N.S., Heeger, A.J., Wudl, F., Janssen, R.A.J., Hummelen, J.C., Lee, Kwanghee, Pakbaz, K., Sariciftci, N.S., Heeger, A.J., and Wudl, F.

Abstract

We present near-steady-state photoinduced absorption (PIA), photoluminescence, and light-induced electron spin resonance (LESR) studies on photoinduced electron transfer reactions from poly(bis-2,5-epi-cholestanoxy-1,4-phenylene vinylene) (BeCHA-PPV) as a donor to Buckminsterfullerene (C60) and a number of functionalized fullerenes as acceptors. We show that functionalized fullerenes with a solubilizing side chain linked to C60 in a [5,6] (fulleroid) or [6,6] (methanofullerene) fashion, are efficient electron acceptors towards BeCHA-PPV, as evidenced from changes in the PIA, the efficient quenching of the photoluminescence, and the LESR spectra of BeCHA-PPV cation and fullerene anion radicals. The increased miscibility of the functionalized fullerenes with the conjugated polymer as compared to C60, can be important for the preparation of future electrooptic devices, based on the photoinduced charge separation.

Published
1995

145. Photoinduced electron transfer reactions in mixed films of pi-conjugated polymers and a homologous series of tetracyano-p-quinodimethane derivatives

Author

Janssen, R.A.J., Christiaans, M.P.T., Hare, C., Martin, N., Sariciftci, N.S., Heeger, A.J., Wudl, F., Janssen, R.A.J., Christiaans, M.P.T., Hare, C., Martin, N., Sariciftci, N.S., Heeger, A.J., and Wudl, F.

Abstract

Near-steady-state photoinduced absorption (PIA) and photoluminescence studies are presented on photoinduced electron transfer reactions from poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene] (MEH-PPV) and poly[3-(2-(3-methylbutoxy)ethyl)thiophene] (P3MBET) as donors (D) onto a homologous series of tetracyano-p-quinodimethane (TCNQ) derivatives containing fused aromatic rings as acceptors (A) to systematically study the effect of acceptor electron affinity. We observe that composite films of these D/A couples give rise to long-lived charge separated states upon photoexcitation, as evidenced from the formation of polaron bands (radical cation absorption) in the PIA and the concomitant loss of the metastable triplet PIA and photoluminescence that are observed in pristine MEH-PPV and P3MBET. We find that the efficiency of the photoinduced electron transfer reaction correlates with the reduction potential of the acceptors.

Published
1995

150. Infrared photoexcitation spectroscopy of conducting polymer and C60 composites: direct evidence of photo-induced electron transfer

Author

Lee, Kwanghee, Janssen, R.A.J., Sariciftci, N.S., Heeger, A.J., Lee, Kwanghee, Janssen, R.A.J., Sariciftci, N.S., and Heeger, A.J.

Abstract

We report direct spectral evidence of photoinduced electron transfer from the excited state of conducting polymer onto C60 by infrared photoexcitation spectroscopy, from 0.01 eV (100 cm-1) to 1.3 eV (11,000 cm-1). The photoinduced absorption spectra of poly(3-octylthiophene) (P30T) and poly[2-methoxy, 5- (2'ethyl-hexyloxy)-p-phenylene vinylene] (MEH-PPV) are characterized by subgap electronic absorptions and associated infrared-active vibrational modes. Upon adding a few percent of C60 into both conducting polymers, the photoinduced absorption spectra are significantly enhanced in magnitude and two new peaks are found at 1.15 eV and 1.25 eV. The photoinduced charge transfer from conducting polymer onto C60 enhances the quantum efficiency for photogeneration of charge carriers, resulting in the enhanced photoinduced response of conducting polymer and the appearance of 1.15 eV and 1.25 eV signatures associated with C60.

Published
1994

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