Stable Logic Operation of Fiber-Based Single-Walled Carbon Nanotube Transistor Circuits Toward Thread-Like CMOS Circuitry

Jae Sang Heo; Kyung-Tae Kim; Seok-Gyu Ban; Yoon-Jeong Kim; Daesik Kim; Taehoon Kim; Yongtaek Hong; In-Soo Kim; Sung Kyu Park

doi:10.3390/ma11101878

Stable Logic Operation of Fiber-Based Single-Walled Carbon Nanotube Transistor Circuits Toward Thread-Like CMOS Circuitry

Materials (Basel). 2018 Oct 1;11(10):1878. doi: 10.3390/ma11101878.

Authors

Jae Sang Heo^{1

2}, Kyung-Tae Kim³, Seok-Gyu Ban⁴, Yoon-Jeong Kim⁵, Daesik Kim⁶, Taehoon Kim⁷, Yongtaek Hong⁸, In-Soo Kim⁹, Sung Kyu Park¹⁰

Affiliations

¹ School of Electrical and Electronic Engineering, Chung-Ang University, Seoul 06980, Korea. heojs38@gmail.com.
² Department of Medicine, University of Connecticut Health Center, Farmington, CT 06030, USA. heojs38@gmail.com.
³ School of Electrical and Electronic Engineering, Chung-Ang University, Seoul 06980, Korea. ktkim0314@gmail.com.
⁴ School of Electrical and Electronic Engineering, Chung-Ang University, Seoul 06980, Korea. skban39@naver.com.
⁵ School of Electrical and Electronic Engineering, Chung-Ang University, Seoul 06980, Korea. kyj9122875@naver.com.
⁶ Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Korea. goodkds@snu.ac.kr.
⁷ Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Korea. rhlight4@snu.ac.kr.
⁸ Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Korea. yongtaek@snu.ac.kr.
⁹ Department of Medicine, University of Connecticut Health Center, Farmington, CT 06030, USA. ikim@uchc.edu.
¹⁰ School of Electrical and Electronic Engineering, Chung-Ang University, Seoul 06980, Korea. skpark@cau.ac.kr.

Abstract

A fiber-based single-walled carbon nanotube (SWCNT) thin-film-transistor (TFT) has been proposed. We designed complementary SWCNT TFT circuit based on SPICE simulations, with device parameters extracted from the fabricated fiber-based SWCNT TFTs, such as threshold voltage, contact resistance, and off-/gate-leakage current. We fabricated the SWCNTs CMOS inverter circuits using the selective passivation and n-doping processes on a fiber substrate. By comparing the simulation and experimental results, we could enhance the circuit's performance by tuning the threshold voltage between p-type and n-type TFTs, reducing the source/drain contact resistance and off current level, and maintaining a low output capacitance of the TFTs. Importantly, it was found that the voltage gain, output swing range, and frequency response of the fiber-based inverter circuits can be dramatically improved.

Keywords: e-textile; fiber-based electronics; logic circuits; single-walled carbon nanotubes (SWCNTs); thin-film-transistors (TFTs).