The relationship between threshold voltage and dipolar character of self-assembled monolayers in organic thin-film transistors.
We report a quantitative study that describes and correlates the threshold voltage of low-voltage organic field-effect transistors with the molecular structure of self-assembled monolayer dielectrics. We have observed that the component of the dipole moment of such self-assembled molecules perpendicular to the surface correlates linearly with the threshold voltage shift in devices. The model was validated using three different organic semiconductors (pentacene, α,α'-dihexylsexithiophene, and fullerene-C(60)) on six different self-assembled monolayers. The correlation found can help optimize future devices, by tuning the dipole moments of the molecules that constitute the self-assembled monolayer.
Organic Materials & Devices, Institute of Polymer Materials, University Erlangen-Nürnberg, Erlangen, Germany.
Michael
M
Salinas
Christof M
CM
Jäger
Atefeh Y
AY
Amin
Pavlo O
PO
Dral
Timo
T
Meyer-Friedrichsen
Andreas
A
Hirsch
Timothy
T
Clark
Marcus
M
Halik