Fig. 13.

Printed CNT-TFT and integrated circuits using ion-gel dielectrics. a Schematic diagram and optical micrograph of the printed CNT TFT on flexible substrate with ion-gel dielectric and PEDOT:PSS gate electrode. The top right AFM image shows the printed CNT network. b Representative transfer (left) and output (right) characteristics of the printed TFT. c Photograph and circuit schematic of a ring oscillator with printed TFTs. Reproduced from ref. [46]. d Output signal of a ring oscillator driven by a supply voltage of 2 V with a stage delay time of 4.5 μs. e Frequency and stage delay times as functions of supply voltage. Reproduced from ref. [59]