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Communication Dans Un Congrès Année : 2008

Bipolar Charge Transport Model with Trapping and Recombination: Criticality of Model Parameters on the Steady State Solution

Fulbert Baudoin
  • Fonction : Auteur
  • PersonId : 1173638
  • IdRef : 08390705X
Séverine Le Roy
Gilbert Teyssedre
Christian Laurent
  • Fonction : Auteur
  • PersonId : 959909
  • IdRef : 063246104

Résumé

Abstract Charge transport in large band gap insulating materials is still poorly understood and described. Numerical models could help in evaluating the field-dependent dynamical behaviour of the space charge that is customary measured nowadays. As a first step along this approach, we have recently introduced a model describing charge transport and space charge in polyethylene. It consists of bi-polar carrier production (Schottky injection mechanism at the interfaces) and transport including the effects of trapping and recombination. The model has been solved in transient conditions by using state of the art numeric methods producing the space and time evolution of internal charge density and transient external current. Although the approach is useful for predicting transient processes, reaching the steady state conditions can be extremely time-consuming. Hence, we have developed a specific code intended to solve directly the model in steady state conditions. The aim of this communication is to evaluate the critical character of some parameters as regards the charge distribution and external current reached in steady-state conditions. Barrier heights for electron and hole injection at the electrodes, carriers mobility, trapping, detrapping and recombination coefficients have been varied and the effect of such variations are presented. The current-voltage characteristic exhibits three regimes with deviation from the Schottky current. This behaviour is discussed in the light of space charge and profiles obtained in the respective case studies. The role of recombination processes is highlighted in determining the shape of the J-V characteristic. Moreover, we could characterize the different physical phenomena responsible for the change in slope of a characteristic having a sigmoid-like shape which has often been reported experimentally.
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Dates et versions

hal-03987903 , version 1 (14-02-2023)

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  • HAL Id : hal-03987903 , version 1

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Fulbert Baudoin, Séverine Le Roy, Gilbert Teyssedre, Christian Laurent. Bipolar Charge Transport Model with Trapping and Recombination: Criticality of Model Parameters on the Steady State Solution. IOP Conference on charge transport in non-metallic Solids, Londres, UNITED KINGDOM, 2008, Londres, United Kingdom. ⟨hal-03987903⟩
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