Organic semiconductors are highly susceptible to defect formation, leading to electronic states in the gap—traps—which typically reduce the performance and stability of devices. To study these effects, we tuned the degree of charge trapping in organic thin-film transistors by modifying the film deposition procedures and device structure. The resulting charge carrier mobility varied between 10−3 and 10 cm2/V s in 2,8-difluoro-5,11-bis(triethylsilylethynyl)anthradithiophene. We analyzed the data using a Poole-Frenkel-like model and found a strong dependence of mobility on the field in low-mobility transistors and a field-independent mobility in high-performance devices. We confirmed the presence of traps in all films investigated in this study and concluded that the Poole-Frenkel model is not sufficiently sensitive to identify traps when their concentration is below the detection limit.
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12 August 2019
Research Article|
August 12 2019
Field-dependent charge transport in organic thin-film transistors: Impact of device structure and organic semiconductor microstructure
Sajant Anand
;
Sajant Anand
1
Department of Physics and Center for Functional Materials, Wake Forest University
, Winston-Salem, North Carolina 27109, USA
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Katelyn P. Goetz
;
Katelyn P. Goetz
2
Kirchhoff Institute of Physics and Center for Advanced Materials, Universität Heidelberg
, 69120 Heidelberg, Germany
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Zachary A. Lamport
;
Zachary A. Lamport
1
Department of Physics and Center for Functional Materials, Wake Forest University
, Winston-Salem, North Carolina 27109, USA
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Andrew M. Zeidell;
Andrew M. Zeidell
1
Department of Physics and Center for Functional Materials, Wake Forest University
, Winston-Salem, North Carolina 27109, USA
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Oana D. Jurchescu
Oana D. Jurchescu
a)
1
Department of Physics and Center for Functional Materials, Wake Forest University
, Winston-Salem, North Carolina 27109, USA
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Appl. Phys. Lett. 115, 073301 (2019)
Article history
Received:
April 09 2019
Accepted:
July 23 2019
Citation
Sajant Anand, Katelyn P. Goetz, Zachary A. Lamport, Andrew M. Zeidell, Oana D. Jurchescu; Field-dependent charge transport in organic thin-film transistors: Impact of device structure and organic semiconductor microstructure. Appl. Phys. Lett. 12 August 2019; 115 (7): 073301. https://doi.org/10.1063/1.5099388
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