Figure 3.

Dielectric features and OFET application of NPSG. (a) The dielectric constant (k) in the frequency range of 500~10⁵ Hz. (b) The optical dielectric constant (k_o) and refractive index (n) of NPSG and other nanopolymer films. (c) The dependence of DP on the dipole moment, via quantum calculations. The dipole direction on the NPSG oligomer (DP = 4) was marked in red arrow. (d) The dielectric loss tangent (tan δ) of nanopolymer/SiO₂ bilayer at 500~10⁵ Hz. (e) The transfer characteristics of top-gate/bottom-contact devices, where polystyrene (PS) and the doped NPSG serve as the dielectric layer; the pentacene serve as the semiconductor layer. The device structure is shown as well. (f) The field-effect carrier mobility (μ_FET) and the on/off ratio (I_on/I_off), extracted from (e).