Flexible CMOS-Like Circuits Based on Printed P-Type and N-Type Carbon Nanotube Thin-Film Transistors

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• 作者：Xiang Zhang ; Jianwen Zhao ; Junyan Dou ; Masayoshi Tange ; Weiwei Xu ; Lixin Mo ; Jianjun Xie ; Wenya Xu ; Changqi Ma ; Toshiya Okazaki and Zheng Cui
• 刊名：Small
• 出版年：2016
• 出版时间：September 28, 2016
• 年：2016
• 卷：12
• 期：36
• 页码：5066-5073
• 全文大小：3666K
• ISSN：1613-6829

文摘

P-type and n-type top-gate carbon nanotube thin-film transistors (TFTs) can be selectively and simultaneously fabricated on the same polyethylene terephthalate (PET) substrate by tuning the types of polymer-sorted semiconducting single-walled carbon nanotube (sc-SWCNT) inks, along with low temperature growth of HfO₂ thin films as shared dielectric layers. Both the p-type and n-type TFTs show good electrical properties with on/off ratio of ≈10⁵, mobility of ≈15 cm² V⁻¹ s⁻¹, and small hysteresis. Complementary metal oxide semiconductor (CMOS)-like logic gates and circuits based on as-prepared p-type and n-type TFTs have been achieved. Flexible CMOS-like inverters exhibit large noise margin of 84% at low voltage (1/2 V_dd = 1.5 V) and maximum voltage gain of 30 at V_dd of 1.5 V and low power consumption of 0.1 μW. Both of the noise margin and voltage gain are one of the best values reported for flexible CMOS-like inverters at V_dd less than 2 V. The printed CMOS-like inverters work well at 10 kHz with 2% voltage loss and delay time of ≈15 μs. A 3-stage ring oscillator has also been demonstrated on PET substrates and the oscillation frequency of 3.3 kHz at V_dd of 1 V is achieved.