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High seebeck coefficient in mixtures of conjugated polymers

A universal method to obtain record-high electronic Seebeck coefficients is demonstrated while preserving reasonable conductivities in doped blends of organic semiconductors through rational design of the density of states (DOSs). A polymer semiconductor with a shallow highest occupied molecular orb...

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Hauptverfasser: Zuo, Guangzheng (VerfasserIn) , Liu, Xianjie (VerfasserIn) , Fahlman, Mats (VerfasserIn) , Kemerink, Martijn (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2018
In: Advanced functional materials
Year: 2017, Jahrgang: 28, Heft: 15
ISSN:1616-3028
DOI:10.1002/adfm.201703280
Online-Zugang:Verlag, Volltext: https://doi.org/10.1002/adfm.201703280
Verlag, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.201703280
Volltext
Verfasserangaben:Guangzheng Zuo, Xianjie Liu, Mats Fahlman, and Martijn Kemerink

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520 |a A universal method to obtain record-high electronic Seebeck coefficients is demonstrated while preserving reasonable conductivities in doped blends of organic semiconductors through rational design of the density of states (DOSs). A polymer semiconductor with a shallow highest occupied molecular orbital (HOMO) level-poly(3-hexylthiophene) (P3HT) is mixed with materials with a deeper HOMO (PTB7, TQ1) to form binary blends of the type P3HTx:B1-x (0 ≤ x ≤ 1) that is p-type doped by F4TCNQ. For B = PTB7, a Seebeck coefficient S = 1100 µV K−1 with conductivity σ = 0.3 S m−1 at x = 0.10 is achieved, while for B = TQ1, S = 2000 µV K−1 and σ = 0.03 S m−1 at x = 0.05 is found. Kinetic Monte Carlo simulations with parameters based on experiments show good agreement with the experimental results, confirming the intended mechanism. The simulations are used to derive a design rule for parameter tuning. These results can become relevant for low-power, low-cost applications like (providing power to) autonomous sensors, in which a high Seebeck coefficient translates directly to a proportionally reduced number of legs in the thermogenerator, and hence in reduced fabrication cost and complexity. 
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