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

  • Nasima AfsharimaniEmail author
  • Bernard Nysten


Polyvinyl alcohol (PVA) thin films as polymer gate dielectrics, with and without \(\hbox {SiO}_{2}\) nanoparticles were fabricated using spin-coating. Surface roughness and hydrophilicity of PVA and PVA/\(\hbox {SiO}_{2}\) 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 \(\hbox {SiO}_{2}\) in organic thin-film transistors, devices were fabricated based on these polymers using \(\upalpha \), \(\upomega \)-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/\(\hbox {SiO}_{2}\) 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.


Polymer dielectrics surface chemistry electrical and structural properties scanning probe microscopy (SPM) ambipolar thin-film transistor 



The authors gratefully acknowledge Prof Yves Geerts (ULB, Belgium) for providing them with DH4T. They acknowledge financial support provided by the Fondation Louvain (Partenariat Solvay), the Belgian Federal Science Policy (IAP P6/27) and the F.R.S.-FNRS.


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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.Institute of Condensed Matter and Nanosciences (Bio and Soft Matter)Université catholique de LouvainLouvain-la-NeuveBelgium

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