Currents and photocurrents in organic materials determined by the interface phenomena

Godlewski, J.

doi:10.1016/j.cis.2005.04.004

Cited by 20 publications

(12 citation statements)

References 85 publications

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“…Several approaches have been utilized to enhance the OLED performance, including perfect matching between the working functions of the electrodes and the energy levels of the polymer, multilayer device fabrication, and utilization of hole and electron transporting layers . Another recent technique involves the enhancement of Förster energy transfer …”

Section: Introductionmentioning

confidence: 74%

Long‐range dipole–dipole energy transfer enhancement via addition of SiO₂/TiO₂ nanocomposite in PFO/MEH‐PPV hybrid thin films

Al‐Asbahi

Qaid

Jumali

et al. 2019

J of Applied Polymer Sci

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Different weight ratios of poly(9,9‐dioctylfluorene‐2,7‐diyl) (PFO)/poly[2‐methoxy‐5‐(2‐ethylhexyloxy)‐1,4‐phenylenevinylene] (MEH‐PPV) hybrid thin films, with and without a SiO2/TiO2 nanocomposite (NC), were successfully prepared using a solution blending method. All samples were deposited onto glass substrates by a spin coating technique to produce homogeneous thin films. The effect of the SiO2/TiO2 NC on the enhancement of the energy transfer mechanism in the PFO/MEH‐PPV hybrids was investigated. The energy transfer parameters were calculated on the basis of the absorption and emission measurements. The long‐range dipole–dipole energy transfer (Förster type) between the acceptor and donor molecules was enhanced in the presence of the SiO2/TiO2 NC in the hybrid thin films. The addition of the SiO2/TiO2 NC in the PFO/MEH‐PPV hybrids reduced the distance between the donor and acceptor molecules more than the individual addition of SiO2 or TiO2 nanoparticles. Moreover, the direct relationships between the acceptor contents and energy transfer parameters, such as the energy transfer radius (RDA), energy transfer efficiency (η), and energy transfer probability (PDA), were estimated using theoretical fittings. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47845.

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Section: Introductionmentioning

confidence: 74%

Long‐range dipole–dipole energy transfer enhancement via addition of SiO₂/TiO₂ nanocomposite in PFO/MEH‐PPV hybrid thin films

Al‐Asbahi

Qaid

Jumali

et al. 2019

J of Applied Polymer Sci

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“…[9][10][11][12][13][14] The models are based on the standard set of the Poisson equation, current continuity equations, and current equations including both drift and diffusion. 15 The diffusion coefficients are obtained from the Einstein relation.…”

Section: Introductionmentioning

confidence: 99%

Dipole induced anomalous S-shape I-V curves in polymer solar cells

Kumar

Sista

Yang

2009

Journal of Applied Physics

233

165

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A kink is sometimes seen in the I-V curves for organic solar cells. In literature charge blocking has been speculated to be responsible for such kind of anomalous features. In this manuscript, we use poly(3-hexylthiophene):[6, 6]-phenyl-C61-butyric acid methyl ester as our model polymer system and investigate different device structures using ultraviolet photoelectron spectroscopy as our primary tool to investigate the reason for this S-shaped kink. We attribute this anomalous feature to the presence of strong interface dipoles. We further propose a model based on the standard set of Poisson equation, continuity equation, and current density equations including both drift and diffusion components.

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“…2). Possible interfacial recombination mechanisms include reverse diffusive recombination at contacts 34,42 or recombination through defects or impurity states at the interface for thin devices. 43 As such, the simulation suggests that improving the selectivity of the electrodes will lead to an increase in device performance.…”

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confidence: 99%

Towards the development of a virtual organic solar cell: An experimental and dynamic Monte Carlo study of the role of charge blocking layers and active layer thickness

Feron

Fell

Rozanski

et al. 2012

Applied Physics Letters

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Monte Carlo (MC) simulations have been used to fully model organic solar cells. The quantum efficiency and short-circuit current of these virtual devices are in excellent agreement with experimental measurements. Simulations show that, contrary to expectation, indium tin oxide/ poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate)/poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methylester (PCBM)/aluminium devices lack effective charge blocking layers at the electrode interfaces. X-ray photoelectron spectroscopy depth profiling shows that despite a PCBM-rich region near the cathode, interface intermixing at the electrodes combined with incomplete PCBM coverage leads to significant interface recombination. This work highlights the effectiveness of MC simulations as a predictive tool and emphasizes the need to control electrode interface processes. V

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Currents and photocurrents in organic materials determined by the interface phenomena

Cited by 20 publications

References 85 publications

Long‐range dipole–dipole energy transfer enhancement via addition of SiO₂/TiO₂ nanocomposite in PFO/MEH‐PPV hybrid thin films

Long‐range dipole–dipole energy transfer enhancement via addition of SiO₂/TiO₂ nanocomposite in PFO/MEH‐PPV hybrid thin films

Dipole induced anomalous S-shape I-V curves in polymer solar cells

Towards the development of a virtual organic solar cell: An experimental and dynamic Monte Carlo study of the role of charge blocking layers and active layer thickness

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Currents and photocurrents in organic materials determined by the interface phenomena

Cited by 20 publications

References 85 publications

Long‐range dipole–dipole energy transfer enhancement via addition of SiO2/TiO2 nanocomposite in PFO/MEH‐PPV hybrid thin films

Long‐range dipole–dipole energy transfer enhancement via addition of SiO2/TiO2 nanocomposite in PFO/MEH‐PPV hybrid thin films

Dipole induced anomalous S-shape I-V curves in polymer solar cells

Towards the development of a virtual organic solar cell: An experimental and dynamic Monte Carlo study of the role of charge blocking layers and active layer thickness

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Long‐range dipole–dipole energy transfer enhancement via addition of SiO₂/TiO₂ nanocomposite in PFO/MEH‐PPV hybrid thin films

Long‐range dipole–dipole energy transfer enhancement via addition of SiO₂/TiO₂ nanocomposite in PFO/MEH‐PPV hybrid thin films