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Sökning: WFRF:(Fuhrmann Jürgen)

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1.
  • Fuhrmann, Jürgen, et al. (författare)
  • Unipolar Drift-Diffusion Simulation of S-Shaped Current-Voltage Relations for Organic Semiconductor Devices
  • 2020
  • Ingår i: Finite Volumes for Complex Applications IX - Methods, Theoretical Aspects, Examples. FVCA 2020. - Cham : Springer. - 9783030436506 - 9783030436513 ; , s. 625-633
  • Bokkapitel (refereegranskat)abstract
    • We discretize a unipolar electrothermal drift-diffusion model for organic semiconductor devices with Gauss–Fermi statistics and charge carrier mobilities having positive temperature feedback. We apply temperature dependent Ohmic contact boundary conditions for the electrostatic potential and use a finite volume based generalized Scharfetter-Gummel scheme. Applying path-following techniques we demonstrate that the model exhibits S-shaped current-voltage curves with regions of negative differential resistance, only recently observed experimentally.
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2.
  • Görtz, Morgan, et al. (författare)
  • On the convergence rate of the dirichlet-neumann iteration for coupled poisson problems on unstructured grids
  • 2020
  • Ingår i: Finite Volumes for Complex Applications IX - Methods, Theoretical Aspects, Examples, FVCA 2020. - Cham : Springer International Publishing. - 2194-1009 .- 2194-1017. - 9783030436506 ; 323, s. 355-363
  • Konferensbidrag (refereegranskat)abstract
    • We consider thermal fluid structure interaction with a partitioned approach, where typically, a finite volume and a finite element code would be coupled. As a model problem, we consider two coupled Poisson problems with heat conductivities $$\lambda _1$$, $$\lambda _2$$ in one dimension on intervals of length $$l:1$$ and $$l:2$$. Hereby, we consider linear discretizations on arbitrary meshes, such as finite volumes, finite differences, finite elements. For these, we prove that the convergence rate of the Dirichlet-Neumann iteration is given by $$\lambda _1l_2/\lambda _2l_1$$ and is thus independent of discretization and mesh.
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  • Resultat 1-2 av 2

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