Enhanced mobility and effective control of threshold voltage in P3HT-based field-effect transistors via inclusion of oligothiophenes

ACS Applied Materials & Interfaces
Ping-Hsun ChuElsa Reichmanis

Abstract

Improved organic field-effect transistor (OFET) performance through a polymer-oligomer semiconductor blend approach is demonstrated. Incorporation of 2,5-bis(3-dodecylthiophen-2-yl)thieno[3,2-b]thiophene (BTTT) into poly(3-hexylthiophene) (P3HT) thin films leads to approximately a 5-fold increase in charge carrier mobility, a 10-fold increase in current on-off ratio, and concomitantly, a decreased threshold voltage to as low as 1.7 V in comparison to single component thin films. The blend approach required no pre- and/or post treatments, and processing was conducted under ambient conditions. The correlation of crystallinity, surface morphology and photophysical properties of the blend thin films was systematically investigated via X-ray diffraction, atomic force microscopy and optical absorption measurements respectively, as a function of blend composition. The dependence of thin-film morphology on the blend composition is illustrated for the P3HT:BTTT system. The blend approach provides an alternative avenue to combine the advantageous properties of conjugated polymers and oligomers for optimized semiconductor performance.

References

Mar 18, 2004·Journal of the American Chemical Society·Beng S OngSandra Gardner
Mar 16, 2006·Journal of the American Chemical Society·Rui ZhangTomasz Kowalewski
Aug 30, 2011·Nature Nanotechnology·Uwe Holzwarth, Neil Gibson
Nov 25, 2011·Chemical Communications : Chem Comm·Emanuele OrgiuPaolo Samorì
Apr 16, 2014·Nanoscale·Mirella El GemayelPaolo Samorì
Oct 28, 2014·ACS Applied Materials & Interfaces·Mincheol ChangElsa Reichmanis

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Citations

Nov 8, 2017·The Journal of Physical Chemistry. a·Austin L JonesKirk S Schanze

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