Field-induced exciton breaking in conjugated polymers

Arkhipov, VI Vi; Bäßler, H.; Deussen, M.; Göbel, E. O.; Kersting, R.; Kurz, H.; Lemmer, Uli; Mahrt, Rainer F.

doi:10.1103/physrevb.52.4932

Cited by 82 publications

(85 citation statements)

References 37 publications

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“…The result is comparable to the work of Arkhipov et al [7] in which they measure 30% of field-induced luminescence quenching for the electric field ≈ 2 × 10 6 V/cm. Luminescence quenching is explained in the light of the field induced exciton dissociation in the film of poly(p-phenylphenylene vinylene) (PPPV) blended with polycarbonate (PC).…”

Section: Resultssupporting

confidence: 79%

“…[10] with linear generation and bimolecular recombination mechanism assumed. The fraction of excitons that undergo dissociation is field dependent [7]. To quantify the dependence of the polaron generation process on the applied electric field we compare simulated photocurrent spectra with experimental data.…”

Section: Theoretical Basis and The Modelmentioning

confidence: 99%

“…The density of singlet excitons is directly related to incident photon flux intensity. If the electric field is applied to photoexcited polymer, the interchain states can be formed from dissociation of singlet excitons [7].…”

Section: Theoretical Basis and The Modelmentioning

confidence: 99%

“…Interchain species are generated by dissociation of singlet excitons and further, free carriers are produced. We assume that field-induced exciton dissociation is very fast, much faster than singlet exciton recombination [5,7]. The majority charge carriers emerged from the exciton dissociation are hole polarons because of the two orders of magnitude smaller electron polaron mobility [8,9].…”

Section: Theoretical Basis and The Modelmentioning

confidence: 99%

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Field Induced Singlet Exciton Dissociation and Exciton-Exciton Annihilation in MEH-PPV Films Studied by Photocurrent Spectra

et al. 2009

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In this paper we investigate different processes which lead to charge carrier generation in ITO/PEDOT:PSS/MEH-PPV/Al photodetector.Primary photogenerated singlet excitons contribute the photocurrent directly through dissociation on the electrodes. Singlet exciton distribution in the active area of the photodetector is calculated on the base of continuity equation including exciton generation, diffusion, and recombination. Depending on the applied electric field and incident photon flux secondary charge carrier generation processes appear in the active MEH-PPV film. Two bulk charge generation mechanisms are considered. Nonlinear recombination of excitons through exciton-exciton annihilation leads to electron and hole polaron generation. Exciton states are also depopulated by exciton dissociation in the presence of high electric field. We assume hole polarons to be majority charge carriers. Polaron contribution to photocurrent is calculated by solving the continuity and drift-diffusion equations for these carriers. Photocurrent spectra are measured for different bias voltages and different incident photon flux intensities. A good agreement between experimental and simulated data confirms our theoretical approach.

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Section: Resultssupporting

confidence: 79%

Section: Theoretical Basis and The Modelmentioning

confidence: 99%

Section: Theoretical Basis and The Modelmentioning

confidence: 99%

Section: Theoretical Basis and The Modelmentioning

confidence: 99%

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Field Induced Singlet Exciton Dissociation and Exciton-Exciton Annihilation in MEH-PPV Films Studied by Photocurrent Spectra

et al. 2009

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“…As a result, the intersystem crossing may be decelerated by the applied electric field, resulting in the increase of the fluorescence intensity. In contrast with the enhancement, electric-field-induced quenching of PL was reported in conjugated polymers, such as in poly(p-terphenylene vinylene), 24 MEH-PPV, 11 poly(p-phenylphenylenevinylene) blended with polycarbonate, [25][26][27] or poly(p-phenylenevinylene). 28 As the origin of the field-induced quenching of PL reported so far, an exciton model and a band model have been proposed.…”

Section: B Effect Of Electric Field On Spectra and Decay Profile Of mentioning

confidence: 99%

Electric-Field-Induced Enhancement/Quenching of Photoluminescence of π-Conjugated Polymer S3-PPV: Excitation Energy Dependence

Mehata¹,

Hsu²,

Lee³

et al. 2010

J. Phys. Chem. B

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The effects of electric field on absorption and photoluminescence (PL) of films of sulfide-substituted PPV derivative S3-PPV, poly[2-(phenyl)-3-(4′-(3,7-dimethyloctyloxy)phenyl)-1,4-phenylenevinylene-co-2-(11′-decyl sulfanylundecanyloxy)-5-methoxy-1,4-phenylene vinylene], were investigated. Electroabsorption (E-A) and electrophotoluminescence (E-PL) responses of S3-PPV show the Stark shifts, indicating a significant alternation in the molecular polarizability (∆R j) associated with the optical transitions. Field-induced enhancement or quenching is also observed for PL of S3-PPV, depending on the photoexcitation energy, whereas the shape of the PL spectra is independent of the excitation wavelength. The field effects on the decay profiles of PL indicate that the quenching results from a diminished population of the emitting states on excitation at 300 nm, whereas the PL is enhanced on excitation at 471 nm because the emitting state has an increased lifetime. The efficiency of field-assisted generation of electron-hole pairs produced through excitons monotonically increases with increasing excitation energy, and the nonradiative decay rate in the emitting state is diminished by electric fields in S3-PPV. The photoirradiation of S3-PPV in ambient air resulted in rapid degradation of the polymer film.

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Photorefractive Polymers

Chellapan

Joseph

Ramachandran

2011

Handbook of Stimuli‐Responsive Materials

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When perturbed with electromagnetic radiation of appropriate wavelength and intensity, photorefractive (PR) systems alter their local refractive index properties. To achieve PR properties, photoconductivity and electro-optical response are required. This chapter describes the physics and chemistry of PR systems to stimuli such as electric field and light. Various processes such as photogeneration of charge carriers, charge transport, electro-optic (EO) effect, and grating formation are described in the introductory sections. Material requirements, experimental techniques, and types of PR systems are discussed in the context of the recent progress in PR polymers and their applications.The PR effect is observed in materials showing both photoconductivity and an electric-field-dependent refractive index. The first observation of PR effect in a polymer system was made in the EO polymer bisphenol-A-diglycidylether 4-nitro-1,2-phenylenediamine doped with the charge-transporting molecule diethylamino-benzaldehyde diphenylhydrazone [1]. PR media can be used to store a replica of the incident nonuniform intensity pattern as a refractive index modulation. Illumination with uniform intensity distribution of appropriate wavelength will erase any grating that has already been written inside the material, making them suitable for reversible and real-time holography. Many applications such as multiplexed data storage [2], holographic filters [3], neural networks [4], and updatable 3D display [5] have been demonstrated on a laboratory scale, but commercial products are not yet available mainly because of the strict requirements on material quality and the complexity of the optics required to implement these systems. Early searches for better materials had been concentrated on inorganic crystals, but after the invention of polymer PR materials, significant research efforts have directed to this class of materials as well due to the ease of processability, which is an advantage over inorganic crystals. Diffraction efficiency approaching 100% and two-beam coupling (TBC) gain coefficient of >400 cm −1 have been achieved in PR polymers. The gain coefficients in hybrid systems combining liquid crystals or low-molecular-weight glass-forming materials and polymers have Handbook of Stimuli-Responsive Materials. Edited by Marek W. Urban

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Field-induced exciton breaking in conjugated polymers

Cited by 82 publications

References 37 publications

Field Induced Singlet Exciton Dissociation and Exciton-Exciton Annihilation in MEH-PPV Films Studied by Photocurrent Spectra

Field Induced Singlet Exciton Dissociation and Exciton-Exciton Annihilation in MEH-PPV Films Studied by Photocurrent Spectra

Electric-Field-Induced Enhancement/Quenching of Photoluminescence of π-Conjugated Polymer S3-PPV: Excitation Energy Dependence

Photorefractive Polymers

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