Fullerenes in Photoconductive Polymers. Charge Generation and Charge Transport

and, Ying Wang; Suna, A.

doi:10.1021/jp964019t

Cited by 86 publications

(61 citation statements)

References 60 publications

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“…Evidences of emission from a charge transfer exciton recombination have been found in blends of fullerenes and poly(vinycarbazole), [18] while the shift of the charge transfer PL peak with the increasing of the fullerene concentration was not reported. Such a shift can be explained with the decrease of the binding energy of the charge transfer exciton.…”

Section: Full Papermentioning

confidence: 99%

Charge Transfer Excitons in Bulk Heterojunctions of a Polyfluorene Copolymer and a Fullerene Derivative

Loi¹,

Toffanin²,

Muccini³

et al. 2007

Adv Funct Materials

209

211

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The photophysical properties of blends of fluorene copolymer and the fullerene derivative PCBM are analyzed with a particular attention to photovoltaic applications. The properties of the blends are determined by the relative alignment of the HOMO energy levels. In the blend where the HOMO levels of the copolymer and the fullerene are aligned there is not signature of charge stabilization and photovoltaic effect. While in the blend where there is an offset between the HOMO levels the charge stabilization is accompanied by good photovoltaic performances. The photoluminescence spectrum of the latter blend is characterized by the appearance of a new peak at low energy with a lifetime of a few ns that red‐shifts with the increase of the PCBM percentage. The feature is attributed to the emission from a charge‐transfer exciton that is red‐shifted by the change of dielectric constant of the medium.

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Section: Full Papermentioning

confidence: 99%

Charge Transfer Excitons in Bulk Heterojunctions of a Polyfluorene Copolymer and a Fullerene Derivative

Loi¹,

Toffanin²,

Muccini³

et al. 2007

Adv Funct Materials

209

211

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“…CT complexes are known to form in blends of C 60 with poly(vinyl carbazole), PVK, [60] or polyimides, [61] and are responsible for slowed charge recombination in these systems, and they have also been observed in blends of C 60 with zinc phthalocyanine. [62] Until recently, the existence of CT states in MDMO-PPV:PCBM blends was dismissed on the basis of optical spectra.…”

Section: Mechanism For Hole-mobility Enhancementmentioning

confidence: 99%

Ambipolar Charge Transport in Films of Methanofullerene and Poly(phenylenevinylene)/Methanofullerene Blends

et al. 2005

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Herein, we report experimental studies of electron and hole transport in thin films of [6,6]‐phenyl C61 butyric acid methyl ester (PCBM) and in blends of poly[2‐methoxy‐5‐(3′,7′‐dimethyloctyloxy)‐1,4‐phenylenevinylene] (MDMO‐PPV) with PCBM. The low‐field hole mobility in pristine MDMO‐PPV is of the order of 10–7 cm2 V–1 s–1, in agreement with previous studies, whereas the electron mobility in pristine PCBM was found by current‐density–voltage (J–V) measurements to be of the order of 10–2 cm2 V–1 s–1, which is about one order of magnitude greater than previously reported. Adding PCBM to the blend increases both electron and hole mobilities, compared to the pristine polymer, and results in less dispersive hole transport. The hole mobility in a blend containing 67 wt.‐% PCBM is at least two orders of magnitude greater than in the pristine polymer. This result is independent of measurement technique and film thickness, indicating a true bulk property of the material. We therefore propose that PCBM may assist hole transport in the blend, either by participating in hole transport or by changing the polymer‐chain packing to enhance hole mobility. Time‐of‐flight mobility measurements of PCBM dispersed in a polystyrene matrix yield electron and hole mobilities of similar magnitude and relatively non‐dispersive transport. To the best of our knowledge, this is the first report of hole transport in a methanofullerene. We discuss the conditions under which hole transport in the fullerene phase of a polymer/fullerene blend may be expected. The relevance to photovoltaic device function is also discussed.

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“…The singlet state CT complex of PVK with C 60 and C 70 was identifi ed as the main source for generated charges. [ 103 ] Chargetransfer complexes used in literature so far provide absorption in the visible and the near infrared up to 830 nm.…”

Section: Organic Sensitizersmentioning

confidence: 99%

Organic Photorefractive Materials and Applications

2011

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This review describes recent advances and applications in the field of organic photorefractive materials, an interesting area in the field of organic electronics and promising candidate for various aspects of photonic applications. We describe the current state of knowledge about the processes involved in the formation of photorefractive gratings in organic materials and focus on the chemical and photo‐physical aspects of the material structures employed in low glass‐transition temperature amorphous composites and organic photorefractive glasses. State‐of‐the art materials are highlighted and recent demonstrations of photonic applications relying on the reversible holographic nature of the photorefractive materials are discussed.

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Fullerenes in Photoconductive Polymers. Charge Generation and Charge Transport

Cited by 86 publications

References 60 publications

Charge Transfer Excitons in Bulk Heterojunctions of a Polyfluorene Copolymer and a Fullerene Derivative

Charge Transfer Excitons in Bulk Heterojunctions of a Polyfluorene Copolymer and a Fullerene Derivative

Ambipolar Charge Transport in Films of Methanofullerene and Poly(phenylenevinylene)/Methanofullerene Blends

Organic Photorefractive Materials and Applications

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