Excited state electron transfer of fullerenes. Singlet states versus triplet states

Caspar, Jonathan V.; Wang, Y.

doi:10.1016/0009-2614(93)e1471-r

Cited by 38 publications

(11 citation statements)

References 19 publications

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“…The triplet−triplet transient absorption was measured with the flash photolysis apparatus, described in detail before 9b. The luminescence spectra were taken with a Spex Fluorolog equipped with a cooled R928 photomultiplier tube (250−850 nm).…”

Section: Methodsmentioning

confidence: 99%

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Fullerenes in Photoconductive Polymers. Charge Generation and Charge Transport

and

Suna

1997

J. Phys. Chem. B

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Fullerenes enhance the photoconductivity of photoconductive polymers. This paper studies the mechansim of enhancement both experimentally and theoretically. The effects of fullerene doping on the spectroscopic, charge generation, and charge transport properties of the polymer are reported. Electrical field effects and magnetic field effects are examined. On the basis of these data a charge generation mechansim involving a singlet of weak charge-transfer complex is proposed for fullerene-doped N-poly(vinylcarbazole). A new theoretical model combining both the Onsager and Marcus theory is developed to quantitatively account for the field-dependent charge generation efficiency in nonpolar medium.

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Section: Methodsmentioning

confidence: 99%

“…Ferromagnetism 6 and enhanced second-order optical nonlinearity have been observed from these charge transfer complexes. The direct optical excitation of fullerene can lead to excited state electron transfer reactons, ,,− which is the basis of photoconductivity.…”

mentioning

confidence: 99%

Fullerenes in Photoconductive Polymers. Charge Generation and Charge Transport

and

Suna

1997

J. Phys. Chem. B

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“…1.5 eV. [44] Thus, the Fö rster energy transfer from PPV singlet exciton to C 60 would reduce the charge separation efficiency at the interface. In either case, the high-efficiency PL quenching is rationalized because the thickness of the PPV layer is 9 nm, [45] which is comparable to the singlet exciton diffusion length in PPV films.…”

Section: Donor-acceptor Interface and The Photovoltaic Performancementioning

confidence: 99%

Design of Multilayered Nanostructures and Donor–Acceptor Interfaces in Solution‐Processed Thin‐Film Organic Solar Cells

Benten

Ogawa

Ohkita

et al. 2008

Adv Funct Materials

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Multilayered polymer thin‐film solar cells have been fabricated by wet processes such as spin‐coating and layer‐by‐layer deposition. Hole‐ and electron‐transporting layers were prepared by spin‐coating with poly(3,4‐ethylenedioxythiophene) oxidized with poly(4‐styrenesulfonate) (PEDOT:PSS) and fullerene (C60), respectively. The light‐harvesting layer of poly‐(p‐phenylenevinylene) (PPV) was fabricated by layer‐by‐layer deposition of the PPV precursor cation and poly(sodium 4‐styrenesulfonate) (PSS). The layer‐by‐layer technique enables us to control the layer thickness with nanometer precision and select the interfacial material at the donor–acceptor heterojunction. Optimizing the layered nanostructures, we obtained the best‐performance device with a triple‐layered structure of PEDOT:PSS|PPV|C60, where the thickness of the PPV layer was 11 nm, comparable to the diffusion length of the PPV singlet exciton. The external quantum efficiency spectrum was maximum (ca. 20%) around the absorption peak of PPV and the internal quantum efficiency was estimated to be as high as ca. 50% from a saturated photocurrent at a reverse bias of −3 V. The power conversion efficiency of the triple‐layer solar cell was 0.26% under AM1.5G simulated solar illumination with 100 mW cm−2 in air.

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“…C60 anda variety of C60 derivatives are known to undergo inter-or intramolecular electron transfer (ET), in presence of suitable electron donors, to give chargeseparated species [13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Spin polarization and photoinduced electron transfer between ferrocene and fullerene derivatives containing a nitroxide group

et al. 1997

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Fulleropyrrolidine derivatives containing a TEMPO group (FPNOs) are examined in toluene solution, between 200 and 270 K, by TR-EPR spectroscopy afler LASER excitation. Signals of the ground and exeited states are observed and their time profiles are recorded. In presente of ferrocene the time pattern of the pola¡ is modified, showing the occurrence of intermoleeular electron transfer from the donor ferrocene to the excited FPNOs. The rate constant k~r is obtained from the simulation of the EPR signal time evolution of the ground and excited states.

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Excited state electron transfer of fullerenes. Singlet states versus triplet states

Cited by 38 publications

References 19 publications

Fullerenes in Photoconductive Polymers. Charge Generation and Charge Transport

Fullerenes in Photoconductive Polymers. Charge Generation and Charge Transport

Design of Multilayered Nanostructures and Donor–Acceptor Interfaces in Solution‐Processed Thin‐Film Organic Solar Cells

Spin polarization and photoinduced electron transfer between ferrocene and fullerene derivatives containing a nitroxide group

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