Abstract
We compare and contrast the properties of hybrid organic-inorganic self-assembled nanodielectrics (SANDs) based on alternating layers of solution-processed ZrOx and either of two phosphonic acid-functionalized azastilbazolium π-units having opposite dipolar orientations. Conventional Zr-SAND and new inverted IZr-SAND are characterized by Kevin probe, optical spectroscopy, capacitance-voltage measurements, AFM, X-ray reflectivity, and electronic structure computation. The molecular dipolar orientation affects thin-film transistor (TFT) threshold and turn-on voltages for devices based on either p-channel pentacene or n-channel copper perfluorophthalocyanine. Specifically, Zr-SAND shifts the threshold and turn-on voltages to more positive values, whereas IZr-SAND shifts them in the opposite direction. Capping these SANDs with -SiMe3 groups enhances the effect, affording a 1.3 V difference in turn-on voltage for IZr-SAND vs Zr-SAND-gated organic TFTs. Such tunability should facilitate the engineering of more complex circuits.
| Original language | English |
|---|---|
| Pages (from-to) | 9974-9980 |
| Number of pages | 7 |
| Journal | Chemistry of Materials |
| Volume | 29 |
| Issue number | 23 |
| DOIs | |
| Publication status | Published - Dec 12 2017 |
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ASJC Scopus subject areas
- Chemistry(all)
- Chemical Engineering(all)
- Materials Chemistry
Cite this
The Dipole Moment Inversion Effects in Self-Assembled Nanodielectrics for Organic Transistors. / Wang, Binghao; Di Carlo, Gabriele; Turrisi, Riccardo; Zeng, Li; Stallings, Katie; Huang, Wei; Bedzyk, Michael J.; Beverina, Luca; Marks, Tobin J; Facchetti, Antonio.
In: Chemistry of Materials, Vol. 29, No. 23, 12.12.2017, p. 9974-9980.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The Dipole Moment Inversion Effects in Self-Assembled Nanodielectrics for Organic Transistors
AU - Wang, Binghao
AU - Di Carlo, Gabriele
AU - Turrisi, Riccardo
AU - Zeng, Li
AU - Stallings, Katie
AU - Huang, Wei
AU - Bedzyk, Michael J.
AU - Beverina, Luca
AU - Marks, Tobin J
AU - Facchetti, Antonio
PY - 2017/12/12
Y1 - 2017/12/12
N2 - We compare and contrast the properties of hybrid organic-inorganic self-assembled nanodielectrics (SANDs) based on alternating layers of solution-processed ZrOx and either of two phosphonic acid-functionalized azastilbazolium π-units having opposite dipolar orientations. Conventional Zr-SAND and new inverted IZr-SAND are characterized by Kevin probe, optical spectroscopy, capacitance-voltage measurements, AFM, X-ray reflectivity, and electronic structure computation. The molecular dipolar orientation affects thin-film transistor (TFT) threshold and turn-on voltages for devices based on either p-channel pentacene or n-channel copper perfluorophthalocyanine. Specifically, Zr-SAND shifts the threshold and turn-on voltages to more positive values, whereas IZr-SAND shifts them in the opposite direction. Capping these SANDs with -SiMe3 groups enhances the effect, affording a 1.3 V difference in turn-on voltage for IZr-SAND vs Zr-SAND-gated organic TFTs. Such tunability should facilitate the engineering of more complex circuits.
AB - We compare and contrast the properties of hybrid organic-inorganic self-assembled nanodielectrics (SANDs) based on alternating layers of solution-processed ZrOx and either of two phosphonic acid-functionalized azastilbazolium π-units having opposite dipolar orientations. Conventional Zr-SAND and new inverted IZr-SAND are characterized by Kevin probe, optical spectroscopy, capacitance-voltage measurements, AFM, X-ray reflectivity, and electronic structure computation. The molecular dipolar orientation affects thin-film transistor (TFT) threshold and turn-on voltages for devices based on either p-channel pentacene or n-channel copper perfluorophthalocyanine. Specifically, Zr-SAND shifts the threshold and turn-on voltages to more positive values, whereas IZr-SAND shifts them in the opposite direction. Capping these SANDs with -SiMe3 groups enhances the effect, affording a 1.3 V difference in turn-on voltage for IZr-SAND vs Zr-SAND-gated organic TFTs. Such tunability should facilitate the engineering of more complex circuits.
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U2 - 10.1021/acs.chemmater.7b03397
DO - 10.1021/acs.chemmater.7b03397
M3 - Article
VL - 29
SP - 9974
EP - 9980
JO - Chemistry of Materials
JF - Chemistry of Materials
SN - 0897-4756
IS - 23
ER -