Interplay of device structure and intrinsic polymer photophysics and its effects on the ITO/PEDOT:PSS/MEH-PPV/Al photocurrent spectra

Petrović, Jasna

doi:10.1117/1.3594090

Cited by 2 publications

(1 citation statement)

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“…The charge density in the vicinity of the metal cathode is particularly critical because EL, as a result of the reduced electron transport in the polymer film, originates from the recombination of holes and electrons confined in this region . It must be stressed that electronic charges in a conjugated polymer are not present as free electrons or holes, but as polaronic species. − These species can have vastly different mobilities, always bias-dependent, and the equilibrium between them and neutral carriers like excitons is particularly sensitive to the applied field . It can thus be supposed that the simultaneous injection of carriers by a suitable (<15 V) applied electric field and by SPP-ET nearby the metal cathode shifts the equilibrium carrier concentration so that the polaron holes, injected through ITO and traveling toward the cathode under the applied bias, experience a more favorable electron density, giving rise to a more efficient charge recombination farther from the cathode.…”

Section: Discussionmentioning

confidence: 99%

Photophysics and Dynamics of Surface Plasmon Polaritons-Mediated Energy Transfer in the Presence of an Applied Electric Field

et al. 2012

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The possibility to transfer energy between molecular excitons across a metal film up to 150 nm thick represents a very attractive solution to control and improve the performances of thin optoeletronic devices. This process involves the presence of coupled surface plasmon polaritons (SPPs) at the two dielectric-metal interfaces, capable of mediating the interactions between donor and acceptor, located on opposite sides of the metal film. In this Article, the photophysics and the dynamics of an efficient SPP-mediated energy transfer between a suitable dye and a conjugated polymer is characterized by means of steady-state and time-resolved photoluminescence techniques. The process is studied in model multilayer structures (donor/metal/acceptor) as well as in electrically pumped heterostructures (donor/metal cathode/acceptor/anode), to verify the effects of applied electric fields on the efficiency and the dynamics of SPP-mediated energy transfer. A striking enhancement of the overall luminescence was recorded in a particular range of applied bias, suggesting the presence of cooperative effects between optical and electrical stimulations.

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Section: Discussionmentioning

confidence: 99%

Photophysics and Dynamics of Surface Plasmon Polaritons-Mediated Energy Transfer in the Presence of an Applied Electric Field

et al. 2012

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Thickness dependent absorption and polaron photogeneration in poly-(2-metoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene-vinylene)

Petrović

Matavulj

Pinto

et al. 2012

Journal of Applied Physics

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A comprehensive photocurrent spectra analysis of the ITO/PEDOT:PSS/MEH-PPV/Al devices with three different poly-(2-metoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene-vinylene) or MEH-PPV thin-film thicknesses is used to investigate charge carrier photogeneration in this polymer. The photocurrent is calculated based on the hole polaron drift-diffusion model including Poole-Frenkel (P-F) transport. Two mechanisms (monomolecular and Langevin-type bimolecular) for hole polaron recombination are considered separately. The MEH-PPV absorption coefficient spectra dependence on the thin film thickness is experimentally determined and included in our model. By comparing the simulated photocurrent spectra to measured data in the wide range of bias voltages and for devices with different MEH-PPV film thicknesses the polaron photogeneration quantum efficiency (θp) as a function of the electric field is extracted. The θp curves obtained for different devices are perfectly fitted by the P-F expression. It is shown that polaron photogeneration process in the thin MEH-PPV films is affected by the film thickness. A unique polaron photogeneration model which accounts for the field and thickness dependences is achieved when one of the P-F parameters is left to be thickness dependent.

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Interplay of device structure and intrinsic polymer photophysics and its effects on the ITO/PEDOT:PSS/MEH-PPV/Al photocurrent spectra

Cited by 2 publications

References 76 publications

Photophysics and Dynamics of Surface Plasmon Polaritons-Mediated Energy Transfer in the Presence of an Applied Electric Field

Photophysics and Dynamics of Surface Plasmon Polaritons-Mediated Energy Transfer in the Presence of an Applied Electric Field

Thickness dependent absorption and polaron photogeneration in poly-(2-metoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene-vinylene)

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