46‐2: Invited Paper: Strip‐Helix‐Fiber Architecture for Stretchable TFTs and Circuits

• Published in: SID International Symposium Digest of technical papers Vol. 53; no. 1; pp. 581 - 584
• Main Authors: Nathan, Arokia, Yu, Jun, Jiang, Chen, Ma, Hanbin
• Format: Journal Article
• Language: English
• Published: Campbell Wiley Subscription Services, Inc 01.06.2022
• Subjects: Amplifiers; Circuit design; Coils (strip); Inkjet printing; inkjet printing technology; Organic thin film transistor; Power consumption; Power management; Semiconductor devices; Stretchability; stretchable electronics; Strip; Thin film transistors; Transconductance; ultralow power; Voltage gain
• ISSN: 0097-966X; 2168-0159
• DOI: 10.1002/sdtp.15554

This paper reviews design considerations for ultralow power thin‐film transistor and amplifier circuits with high stretchability for newly emerging wearable applications. To achieve high stretchability, the device/circuit is layered on an active strip fiber that is coiled in a helical pattern around a core carrier‐fiber. This results in a helical strain of the device/circuit to below 1% despite the core carrier‐fiber being subject to an external strain of 50%. The active helical strip fiber architecture comprises a low‐voltage organic thin‐film transistor and amplifier operating in deep‐subthreshold regime. The thin film transistor and amplifier is layered entirely using inkjet printing technology. The highly stretchable amplifier has a high voltage gain of 214 V/V with subthreshold transconductance efficiency of 0. 6q/kT and ultralow power consumption of 681 pW.