Air-stable ambipolar organic thin-film transistors based on an organic homostructure

Ambipolar organic thin-film transistors (TFTs) based on a fluorinated copper phthalocyanine $\left({\mathrm{F}}_{16}\mathrm{Cu}\mathrm{Pc}\right)∕\text{copper}$ phthalocyanine (CuPc) homostructure layer were fabricated and characterized. The homostructure TFTs showed typical air-stable ambipolar characteristics, with hole and electron mobilities of $1.44\times {10}^{-3}$ and $9.97\times {10}^{-4}{\mathrm{cm}}^2∕\mathrm{V}\mathrm{s}$ , respectively, which are comparable to unipolar mobilities in these single-layer devices. X-ray diffraction analysis suggests highly ordered ${\mathrm{F}}_{16}\mathrm{Cu}\mathrm{Pc}$ and CuPc polycrystalline thin films could be continuously grown via an intermediate-phase layer in the homostructure.