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    Role of band states and trap states in the electrical properties of organic semiconductors: Hopping versus mobility edge model

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    Type
    Article
    Authors
    Mehraeen, Shafigh
    Coropceanu, Veaceslav cc
    Brédas, Jean-Luc
    KAUST Grant Number
    KUS-C1-015-21
    Date
    2013-05-28
    Permanent link to this record
    http://hdl.handle.net/10754/599530
    
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    Abstract
    We compare the merits of a hopping model and a mobility edge model in the description of the effect of charge-carrier concentration on the electrical conductivity, carrier mobility, and Fermi energy of organic semiconductors. We consider the case of a composite electronic density of states (DOS) that consists of a superposition of a Gaussian DOS and an exponential DOS. Using kinetic Monte Carlo simulations, we apply the two models in order to interpret the recent experimental data reported for n-doped C60 films. While both models are capable of reproducing the experimental data very well and yield qualitatively similar characteristic parameters for the density of states, some discrepancies are found at the quantitative level. © 2013 American Physical Society.
    Citation
    Mehraeen S, Coropceanu V, Brédas J-L (2013) Role of band states and trap states in the electrical properties of organic semiconductors: Hopping versus mobility edge model. Physical Review B 87. Available: http://dx.doi.org/10.1103/PhysRevB.87.195209.
    Sponsors
    We thank Antoine Kahn and Selina Olthof for many fruitful discussions. This work has been supported by the King Abdullah University of Science and Technology (KAUST), Award No. KUS-C1-015-21, in the framework of the Center for Advanced Molecular Photovoltaics (CAMP). Computational resources have been provided by the CRIF Program of the National Science Foundation under Award CHE-0946869.
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review B
    DOI
    10.1103/PhysRevB.87.195209
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevB.87.195209
    Scopus Count
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