Dependence of Seebeck Coefficient on the Density of States in Organic Semiconductors

The thermoelectric properties of organic semiconductors are studied theoretically. Based on the Miller-Abrahams hopping model and the concept of genuine transport energy, we obtained the analytic expressions of carriers concentration, conductivity, and Seebeck coefficient. Combining an exponential-t...

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Bibliographic Details
Published in:IEEE electron device letters Vol. 38; no. 12; pp. 1728 - 1731
Main Authors: Shi, Xiaohong, Sun, Jiuxun
Format: Journal Article
Language:English
Published: IEEE 01.12.2017
Subjects:
Charge carrier density
Conductivity
density of states
Energy states
genuine transport energy
Mathematical model
Organic light emitting diodes
Organic semiconductors
Seebeck coefficient
ISSN:0741-3106, 1558-0563
Online Access:Get full text
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Summary:The thermoelectric properties of organic semiconductors are studied theoretically. Based on the Miller-Abrahams hopping model and the concept of genuine transport energy, we obtained the analytic expressions of carriers concentration, conductivity, and Seebeck coefficient. Combining an exponential-type density of states with clear cutting tail at some places, the dependence of Seebeck coefficient on carrier concentration and temperature can be evaluated. The numerical results with optimized parameters describe the experimental data well.
ISSN:0741-3106
1558-0563
DOI:10.1109/LED.2017.2765458