High-$\kappa$ field-effect transistor with copper-phthalocyanine

The use of SrTiO${}_3$ dielectrics as high-permittivity insulator in organic thin film field effect transistors (FET) is evaluated. Field-effect transistors with sputtered SrTiO${}_3$ and copper-phthalocyanine (CuPc) as semiconducting layer were fabricated. The device preparation was performed in-situ in an ultra high vacuum chamber system. The dielectric in the transistors had a permittivity of up to 200 which led to low driving voltages of 3 V. The field effect transistors were p-type and reached mobilities of about $\mu = 1.5\times 10^{-3}$cm$^2$\mathrm{/}Vsandanon\mathrm{/}offratioof$10^3$. These properties are compared to devices based on other dielectric materials.