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. 2019 May 14;10:2161. doi: 10.1038/s41467-019-10145-9

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Device layer structures and electrical characterizations of CNT TFTs on a plastic substrate. a Layer structures of the CNT TFT device. b Photos of CNT TFT devices fabricated on a 10-μm flexible polyimide substrate. The thin flexible devices show good conformal attachment to human skin. c Transfer characterizations of CNT TFTs before and after SAM layer modification and Al₂O₃ encapsulation (V_DS = −1 V). d On-current bias stability of a CNT TFT before and after Al₂O₃ encapsulation. Inset shows the enlarged area (0–16 s) of the bias stability test. e Off-current bias stability of a CNT TFT before and after Al₂O₃ encapsulation. Inset shows the enlarged area (0–16 s). f, g Mobility statistics from 56 CNT TFTs tested on a 4-inch wafer. The 56 CNT TFTs are distributed on the yellow areas. The colored scale bar indicates the mobility values. Dark blue areas are circuit areas and were not tested. The average mobility of CNT TFTs is 23.4 cm² V⁻¹ s⁻¹ with a standard deviation of 2.15 cm² V^-1 s^-1. h Bending test of a flexible TFT with a bending radius of 5 mm. Only slight current changes (<10%) were observed after 10 times of repeated bending. Inset shows the bending and testing setup image