Modified charge carrier density for organic semiconductors modeled by an exponential density of states

Charge-transport models are usually developed by first finding an appropriate density of states (DOS) which is extracted from experimental data. For organic materials, two of the more common ones include the Gaussian density of states and the exponential density of states (EDOS). This article will f...

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Bibliographic Details
Published in:Journal of computational electronics 2021-02, Vol.20 (1), p.259-266
Main Authors: Hart, Kevin, Hart, Sean, Selvaggi, Jerry P.
Format: Article
Language:English
Subjects:
Carrier density
Current carriers
Density of states
Electrical Engineering
Engineering
Exponential functions
Mathematical and Computational Engineering
Mathematical and Computational Physics
Mathematical models
Mechanical Engineering
Optical and Electronic Materials
Organic materials
Organic semiconductors
Semiconductors
Temperature
Theoretical
Transistors
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Summary:Charge-transport models are usually developed by first finding an appropriate density of states (DOS) which is extracted from experimental data. For organic materials, two of the more common ones include the Gaussian density of states and the exponential density of states (EDOS). This article will focus on the latter. Charge-transport models which employ an EDOS have been extensively researched, and many articles are still being published. However, from an analytical point of view, only approximate mathematical expressions for the charge carrier density are ever used. This, in general, forces a charge-transport model to be valid only within a limited temperature range. This article illustrates a more mathematically exact way to handle an organic semiconductor whose DOS can be represented by an exponential function.
ISSN:1569-8025
1572-8137
DOI:10.1007/s10825-020-01569-4