Vertically stacked complementary inverters with solution-processed organic semiconductors

We report on vertically stacked complementary inverters implemented with a solution-processed [6,6]-phenyl c61 butyric acid methyl ester (PCBM) n-channel thin-film transistor (TFT) fabricated on top of a 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene) and poly(triarylamine) (PTAA) blend p-channel TFT. With a shared common gate electrode positioned between two dielectric layers, bottom-contact p- and top-contact n-channel TFTs showed saturation mobility values of 0.25 and 0.004 cm2/V s and threshold voltages of −3.9, and 0.3 V, respectively. The inverter yielded a gain value of −24 V/V with a switching threshold voltage value of 3.3 V at a supply voltage of 7 V. This demonstration of the use of solution-processed semiconductors in a vertically stacked complementary inverter geometry is a step forward towards the development of low-cost complementary electronics.

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► Solution-processed p- and n-channel organic semiconductors.
► Vertically stacked p- and n-channel transistors and complementary inverters.
► Independent control of capacitance density and gate dielectric interfaces.
► Low temperature processing below 110 °C.
► High packing density and interconnectivity.