Jump to main content
Jump to site search

Issue 39, 2012
Previous Article Next Article

Effects of gate dielectrics and their solvents on characteristics of solution-processed N-channel polymer field-effect transistors

Author affiliations

Abstract

In this study, we investigated the effects of polymer gate dielectrics and their solvents on the characteristics of n-channel top-gate-structured organic field-effect transistors (OFETs) that used poly{[N,N-9-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,59-(2,29-bithiophene)} (P(NDI2OD-T2)) (ActivInk™ N2200). The characteristics of P(NDI2OD-T2)-based OFETs are strongly dependent on the chemical properties of the polymer gate dielectrics used and the morphology of the semiconductor–dielectric interface, which is dependent of the dielectric solvent used for dielectric-layer deposition. Both spin-coated and inkjet-printed P(NDI2OD-T2)-based FETs exhibited reasonably high values of field-effect mobility (μFET) at 0.1–0.3 cm2 V−1 s−1 with poly(methyl methacrylate) as the gate dielectric and a number of carefully selected orthogonal solvents. The value of μFET decreased to 0.03 cm2 V−1 s−1 for a solvent with poor orthogonality (1,2-dichloroethane). This was due to the semiconductor–dielectric interface being rough owing to the dissolution and/or swelling of the underlying P(NDI2OD-T2) layer. In addition, the value of μFET decreased dramatically, to 0.005 cm2 V−1 s−1, with poly(4-vinyl phenol) (PVP) as the dielectric material, dissolved in a perfectly orthogonal solvent (1-butanol). This was due to electron trapping by the hydroxyl groups in PVP.

Graphical abstract: Effects of gate dielectrics and their solvents on characteristics of solution-processed N-channel polymer field-effect transistors

Back to tab navigation

Publication details

The article was received on 29 Jun 2012, accepted on 19 Aug 2012 and first published on 21 Aug 2012


Article type: Paper
DOI: 10.1039/C2JM34218A
J. Mater. Chem., 2012,22, 21138-21143

  •   Request permissions

    Effects of gate dielectrics and their solvents on characteristics of solution-processed N-channel polymer field-effect transistors

    K. Baeg, A. Facchetti and Y. Noh, J. Mater. Chem., 2012, 22, 21138
    DOI: 10.1039/C2JM34218A

Search articles by author

Spotlight

Advertisements