1. The Dipole Moment Inversion Effects in Self-Assembled Nanodielectrics for Organic Transistors
- Author
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Tobin J. Marks, Li Zeng, Antonio Facchetti, Wei Huang, Binghao Wang, Michael J. Bedzyk, Riccardo Turrisi, Gabriele Di Carlo, Luca Beverina, Katie Stallings, Wang, B, Di Carlo, G, Turrisi, R, Zeng, L, Stallings, K, Huang, W, Bedzyk, M, Beverina, L, Marks, T, and Facchetti, A
- Subjects
Materials science ,General Chemical Engineering ,chemistry.chemical_element ,02 engineering and technology ,Electronic structure ,010402 general chemistry ,01 natural sciences ,law.invention ,Pentacene ,chemistry.chemical_compound ,Nuclear magnetic resonance ,law ,Materials Chemistry ,Chemical Engineering (all) ,Spectroscopy ,Materials Chemistry2506 Metals and Alloy ,business.industry ,Transistor ,Chemistry (all) ,General Chemistry ,021001 nanoscience & nanotechnology ,Copper ,0104 chemical sciences ,Dipole ,chemistry ,Thin-film transistor ,Optoelectronics ,0210 nano-technology ,business ,Voltage - Abstract
We compare and contrast the properties of hybrid organic-inorganic self-assembled nanodielectrics (SANDs) based on alternating layers of solution-processed ZrOxand either of two phosphonic acid-functionalized azastilbazolium Ï -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 -SiMe3groups 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
- Published
- 2017