Abstract
Ambipolar and p-type single-walled carbon nanotube (SWCNT) thin-film transistors (TFTs) are reliably integrated into various complementary-like circuits on the same substrate by inkjet printing. We describe the fabrication and characteristics of inverters, ring oscillators, and NAND gates based on complementary-like circuits fabricated with such TFTs as building blocks. We also show that complementary-like circuits have potential use as chemical sensors in ambient conditions since changes to the TFT characteristics of the p-channel TFTs in the circuit alter the overall operating characteristics of the circuit. The use of circuits rather than individual devices as sensors integrates sensing and signal processing functions, thereby simplifying overall system design.
Highlights
Ambipolar and p-type single-walled carbon nanotubes (SWCNTs) TFTs were integrated on the same glass substrate using inkjet printing
Various complementary-like circuits have been realized by integrating ambipolar and p-type SWCNT TFTs three-dimensionally on the same glass substrate
Different doping conditions are achieved by employing the same channel material (SWCNTs) with an Al2O3 layer for ambipolar TFTs or exposure to air for p-TFTs
Summary
P-type SWCNT TFTs fabricated by photo/shadow mask-free methods. Inkjet printing is employed in a more complex circuit fabrication scheme, rather than unit TFTs, where all seven layers are deposited or patterned by inkjet printing. In these circuits, ambipolar and p-type TFTs in the circuits are implemented on different planes as a three-dimensional integrated circuit demonstration, which is not possible with conventional semiconductor materials. A shared Al2O3 layer is utilized for conductivity type conversion (from p- to ambipolar-type) and gate dielectric layers for p-TFTs whose channels are open to the air. Various complementary-like circuits, which include inverters, ROSCs, and NAND gates, are demonstrated. SWCNTs are exposed to acetone vapor, which is an exemplary polar analyte, to investigate the effects of chemical vapors on these circuits
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