Effects of thermal and electrical stress on DH4T-based organic thin-film-transistors with PMMA gate dielectrics

Wrachien, Nicola; Lago, Nicolò; Rizzo, Antonio; D’Alpaos, Riccardo; Stefani, Andrea; Turatti, Guido; Muccini, Michele; Meneghesso, Gaudenzio; Cester, A.

doi:10.1016/j.microrel.2015.06.073

Cited by 5 publications

(1 citation statement)

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“…Ambipolar behaviours are observed for both systems. This observation is in contradiction with previous reports which showed that DH4T-based OTFTs present p-type behaviours in both organic [32] and inorganic [33] dielectric materials. However, it has already been reported that organic semiconductors can be ambipolar on hydroxyl-terminated dielectrics though surface dipoles make n-channel behaviour less likely [10,16,23,34].…”

Section: Discussioncontrasting

confidence: 99%

Hybrid gate dielectrics: a comparative study between polyvinyl alcohol/ $$\hbox {SiO}_{2}$$ SiO 2 nanocomposite and pure polyvinyl alcohol thin-film transistors

Afsharimani

Nysten

2019

Bull Mater Sci

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Polyvinyl alcohol (PVA) thin films as polymer gate dielectrics, with and without SiO 2 nanoparticles were fabricated using spin-coating. Surface roughness and hydrophilicity of PVA and PVA/SiO 2 thin films were studied by contact-angle measurements and atomic force microscopy. The dielectric properties were characterized via capacitance and leakage-current measurements on metal-insulator-metal structures. In order to further investigate the application potential of such materials as a replacement for conventional inorganic dielectrics such as SiO 2 in organic thin-film transistors, devices were fabricated based on these polymers using α, ω-dihexylquaterthiophene as an active layer. Performance of the devices was realized by electrical measurements and Kelvin probe force microscopy. All transistors showed hole and electron mobilities in the low-voltage range. PVA/SiO 2 films showed larger capacitance, less hydrophilicity, rougher surfaces and considerable leakage currents compared with those with neat PVA. Although integrating nanoparticles modified surface electronic properties and showed a shift in surface potential as observed in Kelvin probe force measurements, it appears that non-polymeric and neat polymeric dielectric materials could still be a privilege to nanocomposite polymeric dielectrics for optoelectronic applications.

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