Low-temperature metal–oxide thin-film transistor technologies for implementing flexible electronic circuits and systems

Runxiao Shi; Tengteng Lei; Zhihe Xia; Man Wong

doi:10.1088/1674-4926/44/9/091601

J. Semicond. > 2023, Volume 44 > Issue 9 > 091601

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Low-temperature metal–oxide thin-film transistor technologies for implementing flexible electronic circuits and systems

Runxiao Shi^§, Tengteng Lei^§, Zhihe Xia and Man Wong

+ Author Affiliations

State Key Laboratory of Advanced Displays and Optoelectronics and Technologies, Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
^§Runxiao Shi and Tengteng Lei contributed equally to this work and should be considered as co-first authors.

Author Bio:

Runxiao Shi received his BE degree from Southeast University in 2017 and ME degree from Waseda University in 2018. He is currently working toward a PhD degree with the Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology. His research interests include flexible indium-gallium-zinc–oxide thin-film transistors and circuits based on metal–oxide TFTs.

Tengteng Lei got her BS degree from Sun Yat-sen University in 2017 and MS degree from Peking University in 2020. She is currently a PhD student at the State Key Laboratory of Advanced Displays and Optoelectronics Technologies of The Hong Kong University of Science and Technology under the supervision of Prof. Man Wong. Her research interests include metal–oxide thin-film transistors, thin-film integrated circuit design, and tactile sensor arrays.

Zhihe Xia received a PhD degree from the Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Hong Kong, in 2019. His current research interests include novel metal–oxide thin-film transistors with advanced devices and flexible electronics.

Man Wong received a PhD degree in electrical engineering from the Center for Integrated Systems, Stanford University, Palo Alto, CA, USA. Since 1992, he has been a faculty member at the Department of Electrical and Electronic Engineering of The Hong Kong University of Science and Technology, Hong Kong.

Corresponding author: Man Wong, eemwong@ust.hk

DOI: 10.1088/1674-4926/44/9/091601

Abstract: Here we review two 300 °C metal–oxide (MO) thin-film transistor (TFT) technologies for the implementation of flexible electronic circuits and systems. Fluorination-enhanced TFTs for suppressing the variation and shift of turn-on voltage (V_ON), and dual-gate TFTs for acquiring sensor signals and modulating V_ON have been deployed to improve the robustness and performance of the systems in which they are deployed. Digital circuit building blocks based on fluorinated TFTs have been designed, fabricated, and characterized, which demonstrate the utility of the proposed low-temperature TFT technologies for implementing flexible electronic systems. The construction and characterization of an analog front-end system for the acquisition of bio-potential signals and an active-matrix sensor array for the acquisition of tactile images have been reported recently.

Key words: flexible electronics, metal–oxide semiconductor, thin-film transistor, dual gate, fluorination, analog front-end system, sensors

References

[1]	Zhu Y, He Y L, Jiang S S, et al. Indium–gallium–zinc–oxide thin-film transistors: Materials, devices, and applications. J Semicond, 2021, 42, 031101 doi: 10.1088/1674-4926/42/3/031101
[2]	Myny K, Lai Y C, Papadopoulos N, et al. A flexible ISO14443-a compliant 7.5mW 128b metal-oxide NFC barcode tag with direct clock division circuit from 13.56MHz carrier. 2017 IEEE International Solid-State Circuits Conference (ISSCC), 2017, 258 doi: 10.1109/ISSCC.2017.7870359
[3]	Fuketa H, Yoshioka K, Shinozuka Y, et al. 1µm-thickness 64-channel surface electromyogram measurement sheet with 2V organic transistors for prosthetic hand control. 2013 IEEE International Solid-State Circuits Conference Digest of Technical Papers, 2013, 104 doi: 10.1109/ISSCC.2013.6487656
[4]	Biggs J, Myers J, Kufel J, et al. A natively flexible 32-bit Arm microprocessor. Nature, 2021, 595, 532 doi: 10.1038/s41586-021-03625-w
[5]	Hosono H. How we made the IGZO transistor. Nat Electron, 2018, 1, 428 doi: 10.1038/s41928-018-0106-0
[6]	Xia Z H, Lu L, Li J P, et al. Self-aligned elevated-metal metal-oxide thin-film transistors for displays and flexible electronics. 2019 IEEE International Electron Devices Meeting (IEDM), 2020, 8.4. 1 doi: 10.1109/IEDM19573.2019.8993653
[7]	Wang S S, Shi R X, Li J P, et al. Resilience of fluorinated indium-gallium-zinc oxide thin-film transistor against hydrogen-induced degradation. IEEE Electron Device Lett, 2020, 41, 729 doi: 10.1109/LED.2020.2983789
[8]	Wang Y Q, Jiang W, Xie X Y, et al. A kinetic model for the generation and annihilation of thermally induced carrier donors in a semiconducting metal-oxide thin film. Small, 2022, 18, 2203346 doi: 10.1002/smll.202203346
[9]	Lu L, Xia Z H, Li J P, et al. A comparative study on fluorination and oxidation of indium–gallium–zinc oxide thin-film transistors. IEEE Electron Device Lett, 2018, 39, 196 doi: 10.1109/LED.2017.2781700
[10]	Li J P, Lu L, Feng Z Q, et al. An oxidation-last annealing for enhancing the reliability of indium-gallium-zinc oxide thin-film transistors. Appl Phys Lett, 2017, 110, 142102 doi: 10.1063/1.4979649
[11]	Wang S S, Shi R X, Li J P, et al. 24-2: Distinguished student paper: Fluorination for enhancing the resistance of indium-gallium-zinc oxide thin-film transistor against hydrogen-induced degradation. SID Symp Dig Tech Pap, 2020, 51, 347 doi: 10.1002/sdtp.13875
[12]	Myny K. The development of flexible integrated circuits based on thin-film transistors. Nat Electron, 2018, 1, 30 doi: 10.1038/s41928-017-0008-6
[13]	Spijkman M J, Myny K, Smits E C P, et al. Dual-gate thin-film transistors, integrated circuits and sensors. Adv Mater, 2011, 23, 3231 doi: 10.1002/adma.201101493
[14]	Lei T, Shao L L, Zheng Y Q, et al. Low-voltage high-performance flexible digital and analog circuits based on ultrahigh-purity semiconducting carbon nanotubes. Nat Commun, 2019, 10, 1 doi: 10.1038/s41467-018-07882-8
[15]	Liu F Y, Liu Z H, Gao S Y, et al. Polyimide film with low thermal expansion and high transparency by self-enhancement of polyimide/SiC nanofibers net. RSC Adv, 2018, 8, 19034 doi: 10.1039/C8RA02479K
[16]	Yung K C, Zeng D W, Yue T M. XPS investigation of Upilex-S polyimide ablated by 355 nm Nd: YAG laser irradiation. Appl Surf Sci, 2001, 173, 193 doi: 10.1016/S0169-4332(00)00884-9
[17]	Shi R X, Wang S S, Xia Z H, et al. Fluorinated metal-oxide thin-film transistors for circuit implementation on a flexible substrate. IEEE J Flex Electron, 2022, 1, 58 doi: 10.1109/JFLEX.2021.3140044
[18]	Lu L, Li J P, Kwok H S, et al. High-performance and reliable elevated-metal metal-oxide thin-film transistor for high-resolution displays. 2016 IEEE International Electron Devices Meeting (IEDM), 2017, 32.2. 1 doi: 10.1109/IEDM.2016.7838526
[19]	Xie X, Chen K, Zhou Z, et al. Conductive indium-tin-zinc-oxide formed using an oxygen plasma treatment through a silicon oxide cover layer. in Digest Tech. Papers SID'23 Conference, 2023.
[20]	Huang T C, Fukuda K, Lo C M, et al. Pseudo-CMOS: A design style for low-cost and robust flexible electronics. IEEE Trans Electron Devices, 2011, 58, 141 doi: 10.1109/TED.2010.2088127
[21]	Shi R X, Liu X C, Lei T T, et al. An integrated analog front-end system on flexible substrate for the acquisition of bio-potential signals. Adv Sci, 2023, 10, 2207683 doi: 10.1002/advs.202207683
[22]	Lei T, Hu Y, Xie X, et al. An active-matrix piezoelectric tactile sensor array with in-pixel amplifier and non-uniformity compensation. in Digest Tech. Papers Transducers'23 Conference, 2023.
[23]	Lei T T, Hu Y S, Wong M. Active-matrix tactile sensor array based on the monolithic integration of pvdf and dual-gate transistors. 2022 IEEE 35th International Conference on Micro Electro Mechanical Systems Conference (MEMS), 2022, 71 doi: 10.1109/MEMS51670.2022.9699743

Fig. 1. (Color online) (a) A schematic cross-section of an IGZO or IGZO:F TFT. (b) Comparison of the measured transfer characteristics of IGZO:F and IGZO TFTs with W = 10 µm and L decreasing from 50 to 2 µm. (c) Comparison of the measured transfer characteristics of IGZO:F and IGZO TFTs before and after LLO. (d) Measured statistical distributions of the $ {V}_{\mathrm{O}\mathrm{N}} $ of IGZO:F and IGZO TFTs before and after LLO^[17]. Copyright 2021 IEEE.

DownLoad: Full-Size Img PowerPoint

Fig. 2. (Color online) The fabrication process of SG and DG ITZO TFTs.

DownLoad: Full-Size Img PowerPoint

Fig. 3. (Color online) Transfer characteristics of (a) SG TFTs, (b) DG TFTs with BG as the MG and TG as the OG, and (c) DG TFTs with TG as the MG and BG as the OG; extracted $ {V}_{\mathrm{T}\mathrm{H}} $ of (d) SG TFTs, (e) DG TFTs with BG as the MG and TG as the OG, and (f) DG TFTs with TG as the MG and BG as the OG.

DownLoad: Full-Size Img PowerPoint

Fig. 4. (Color online) Fluorination-enhanced 2-4 decoder^[17]. (a) Gate-level schematic and truth table of a 2-4 decoder. (b) TFT-level circuit diagram and truth table of an INV. (c) TFT-level circuit diagram and truth table of a NOR. (d) A photograph of a fabricated 2-4 decoder on PI. (e) Measured VTCs of 2-4 decoders fabricated using IGZO:F TFTs. (f) Measured VTCs of 2-4 decoders fabricated using IGZO TFTs. (g) Simulated VTCs of ideal implementation with the same $ {V}_{\mathrm{O}\mathrm{N}} $ ~ 0 V for all TFTs. (h) Implementation with $ {V}_{\mathrm{O}\mathrm{N}} $ shifts of −4 V for both TFT T8 of the NOR0 gate and the pull-down TFT T6 of the NOR1 gate^[17]. Copyright 2021 IEEE.

DownLoad: Full-Size Img PowerPoint

Fig. 5. (Color online) An AFE system for the acquisition of bio-potential signals. (a) System architecture. (b) PI carrying AFE systems placed on the thenar muscle of a hand. In-vitro measurements of (c) EMG and (d) ECG^[21]. Copyright 2023 Wiley.

DownLoad: Full-Size Img PowerPoint

Fig. 6. (Color online) DG ITZO TFT-based in-pixel amplifiers w/ and w/o provision for compensation of TFT parameter variation: (a) circuit schematic and (b) timing diagram; (c) distribution of MG voltage $ {V}_{\mathrm{B}} $ for 40 pixel circuits w/ and w/o compensation; (d) dependance of $ {A}_{\mathrm{V}} $ on $ {V}_{\mathrm{I}} $ and (e) distribution of $ {A}_{\mathrm{V}} $ at $ {V}_{\mathrm{I}}=0 $ V for 40 amplifiers w/o compensation. In-pixel amplifiers w/ provision for compensation of TFT parameter variation: (f) circuit schematic and (g) timing diagram; (h) microscope image of a tactile pixel and (i) photograph of a 16 $ \times $16 active-matrix tactile sensor array; (j) dependance of $ {A}_{\mathrm{V}} $ on $ {V}_{\mathrm{I}} $ and (k) distribution of $ {A}_{\mathrm{V}} $ at $ {V}_{\mathrm{I}}=0 $ V for 40 amplifiers w/ compensation^[22]. Copyright 2023 IEEE.

DownLoad: Full-Size Img PowerPoint

Fig. 7. (Color online) MG voltage $ {V}_{\mathrm{B}} $ distribution over a 16 $ \times $16 tactile sensor array (a) w/o and (b) w/ compensation^[22]; tactile images from arrays (c) w/o and (d) w/ compensation when loaded with a letter stamp “O”; (e) tactile images acquired from an 8 × 8 tactile sensor array^[23]. Copyright 2022 and 2023 IEEE.

DownLoad: Full-Size Img PowerPoint

Fig. 8. (Color online) A schematic system diagram of a more capable bio-potential acquisition system on a flexible substrate.

DownLoad: Full-Size Img PowerPoint

Fig. 9. (Color online) Flexible tactile sensor array integrated with an artificial neural network as a bionic “smart” system.

DownLoad: Full-Size Img PowerPoint

[1]	Zhu Y, He Y L, Jiang S S, et al. Indium–gallium–zinc–oxide thin-film transistors: Materials, devices, and applications. J Semicond, 2021, 42, 031101 doi: 10.1088/1674-4926/42/3/031101
[2]	Myny K, Lai Y C, Papadopoulos N, et al. A flexible ISO14443-a compliant 7.5mW 128b metal-oxide NFC barcode tag with direct clock division circuit from 13.56MHz carrier. 2017 IEEE International Solid-State Circuits Conference (ISSCC), 2017, 258 doi: 10.1109/ISSCC.2017.7870359
[3]	Fuketa H, Yoshioka K, Shinozuka Y, et al. 1µm-thickness 64-channel surface electromyogram measurement sheet with 2V organic transistors for prosthetic hand control. 2013 IEEE International Solid-State Circuits Conference Digest of Technical Papers, 2013, 104 doi: 10.1109/ISSCC.2013.6487656
[4]	Biggs J, Myers J, Kufel J, et al. A natively flexible 32-bit Arm microprocessor. Nature, 2021, 595, 532 doi: 10.1038/s41586-021-03625-w
[5]	Hosono H. How we made the IGZO transistor. Nat Electron, 2018, 1, 428 doi: 10.1038/s41928-018-0106-0
[6]	Xia Z H, Lu L, Li J P, et al. Self-aligned elevated-metal metal-oxide thin-film transistors for displays and flexible electronics. 2019 IEEE International Electron Devices Meeting (IEDM), 2020, 8.4. 1 doi: 10.1109/IEDM19573.2019.8993653
[7]	Wang S S, Shi R X, Li J P, et al. Resilience of fluorinated indium-gallium-zinc oxide thin-film transistor against hydrogen-induced degradation. IEEE Electron Device Lett, 2020, 41, 729 doi: 10.1109/LED.2020.2983789
[8]	Wang Y Q, Jiang W, Xie X Y, et al. A kinetic model for the generation and annihilation of thermally induced carrier donors in a semiconducting metal-oxide thin film. Small, 2022, 18, 2203346 doi: 10.1002/smll.202203346
[9]	Lu L, Xia Z H, Li J P, et al. A comparative study on fluorination and oxidation of indium–gallium–zinc oxide thin-film transistors. IEEE Electron Device Lett, 2018, 39, 196 doi: 10.1109/LED.2017.2781700
[10]	Li J P, Lu L, Feng Z Q, et al. An oxidation-last annealing for enhancing the reliability of indium-gallium-zinc oxide thin-film transistors. Appl Phys Lett, 2017, 110, 142102 doi: 10.1063/1.4979649
[11]	Wang S S, Shi R X, Li J P, et al. 24-2: Distinguished student paper: Fluorination for enhancing the resistance of indium-gallium-zinc oxide thin-film transistor against hydrogen-induced degradation. SID Symp Dig Tech Pap, 2020, 51, 347 doi: 10.1002/sdtp.13875
[12]	Myny K. The development of flexible integrated circuits based on thin-film transistors. Nat Electron, 2018, 1, 30 doi: 10.1038/s41928-017-0008-6
[13]	Spijkman M J, Myny K, Smits E C P, et al. Dual-gate thin-film transistors, integrated circuits and sensors. Adv Mater, 2011, 23, 3231 doi: 10.1002/adma.201101493
[14]	Lei T, Shao L L, Zheng Y Q, et al. Low-voltage high-performance flexible digital and analog circuits based on ultrahigh-purity semiconducting carbon nanotubes. Nat Commun, 2019, 10, 1 doi: 10.1038/s41467-018-07882-8
[15]	Liu F Y, Liu Z H, Gao S Y, et al. Polyimide film with low thermal expansion and high transparency by self-enhancement of polyimide/SiC nanofibers net. RSC Adv, 2018, 8, 19034 doi: 10.1039/C8RA02479K
[16]	Yung K C, Zeng D W, Yue T M. XPS investigation of Upilex-S polyimide ablated by 355 nm Nd: YAG laser irradiation. Appl Surf Sci, 2001, 173, 193 doi: 10.1016/S0169-4332(00)00884-9
[17]	Shi R X, Wang S S, Xia Z H, et al. Fluorinated metal-oxide thin-film transistors for circuit implementation on a flexible substrate. IEEE J Flex Electron, 2022, 1, 58 doi: 10.1109/JFLEX.2021.3140044
[18]	Lu L, Li J P, Kwok H S, et al. High-performance and reliable elevated-metal metal-oxide thin-film transistor for high-resolution displays. 2016 IEEE International Electron Devices Meeting (IEDM), 2017, 32.2. 1 doi: 10.1109/IEDM.2016.7838526
[19]	Xie X, Chen K, Zhou Z, et al. Conductive indium-tin-zinc-oxide formed using an oxygen plasma treatment through a silicon oxide cover layer. in Digest Tech. Papers SID'23 Conference, 2023.
[20]	Huang T C, Fukuda K, Lo C M, et al. Pseudo-CMOS: A design style for low-cost and robust flexible electronics. IEEE Trans Electron Devices, 2011, 58, 141 doi: 10.1109/TED.2010.2088127
[21]	Shi R X, Liu X C, Lei T T, et al. An integrated analog front-end system on flexible substrate for the acquisition of bio-potential signals. Adv Sci, 2023, 10, 2207683 doi: 10.1002/advs.202207683
[22]	Lei T, Hu Y, Xie X, et al. An active-matrix piezoelectric tactile sensor array with in-pixel amplifier and non-uniformity compensation. in Digest Tech. Papers Transducers'23 Conference, 2023.
[23]	Lei T T, Hu Y S, Wong M. Active-matrix tactile sensor array based on the monolithic integration of pvdf and dual-gate transistors. 2022 IEEE 35th International Conference on Micro Electro Mechanical Systems Conference (MEMS), 2022, 71 doi: 10.1109/MEMS51670.2022.9699743

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Received: 23 April 2023 Revised: 06 June 2023 Online: Accepted Manuscript: 15 August 2023Corrected proof: 18 August 2023Uncorrected proof: 21 August 2023Published: 10 September 2023

Article Navigation > Journal of Semiconductors > 2023 > 44(9): 091601

Runxiao Shi, Tengteng Lei, Zhihe Xia, Man Wong. Low-temperature metal–oxide thin-film transistor technologies for implementing flexible electronic circuits and systems[J]. Journal of Semiconductors, 2023, 44(9): 091601. doi: 10.1088/1674-4926/44/9/091601 ****Runxiao Shi, Tengteng Lei, Zhihe Xia, Man Wong, Low-temperature metal–oxide thin-film transistor technologies for implementing flexible electronic circuits and systems[J]. Journal of Semiconductors, 2023, 44(9), 091601 doi: 10.1088/1674-4926/44/9/091601

Citation:

Runxiao Shi, Tengteng Lei, Zhihe Xia, Man Wong, Low-temperature metal–oxide thin-film transistor technologies for implementing flexible electronic circuits and systems[J]. Journal of Semiconductors, 2023, 44(9), 091601 doi: 10.1088/1674-4926/44/9/091601

Citation:

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Low-temperature metal–oxide thin-film transistor technologies for implementing flexible electronic circuits and systems

DOI: 10.1088/1674-4926/44/9/091601

State Key Laboratory of Advanced Displays and Optoelectronics and Technologies, Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Hong Kong, China

More Information

Runxiao Shi：received his BE degree from Southeast University in 2017 and ME degree from Waseda University in 2018. He is currently working toward a PhD degree with the Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology. His research interests include flexible indium-gallium-zinc–oxide thin-film transistors and circuits based on metal–oxide TFTs
Tengteng Lei：got her BS degree from Sun Yat-sen University in 2017 and MS degree from Peking University in 2020. She is currently a PhD student at the State Key Laboratory of Advanced Displays and Optoelectronics Technologies of The Hong Kong University of Science and Technology under the supervision of Prof. Man Wong. Her research interests include metal–oxide thin-film transistors, thin-film integrated circuit design, and tactile sensor arrays
Zhihe Xia：received a PhD degree from the Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Hong Kong, in 2019. His current research interests include novel metal–oxide thin-film transistors with advanced devices and flexible electronics
Man Wong：received a PhD degree in electrical engineering from the Center for Integrated Systems, Stanford University, Palo Alto, CA, USA. Since 1992, he has been a faculty member at the Department of Electrical and Electronic Engineering of The Hong Kong University of Science and Technology, Hong Kong
Corresponding author: eemwong@ust.hk
Received Date: 2023-04-23
Revised Date: 2023-06-06

Available Online: 2023-08-15

Abstract

Abstract

Here we review two 300 °C metal–oxide (MO) thin-film transistor (TFT) technologies for the implementation of flexible electronic circuits and systems. Fluorination-enhanced TFTs for suppressing the variation and shift of turn-on voltage (V_ON), and dual-gate TFTs for acquiring sensor signals and modulating V_ON have been deployed to improve the robustness and performance of the systems in which they are deployed. Digital circuit building blocks based on fluorinated TFTs have been designed, fabricated, and characterized, which demonstrate the utility of the proposed low-temperature TFT technologies for implementing flexible electronic systems. The construction and characterization of an analog front-end system for the acquisition of bio-potential signals and an active-matrix sensor array for the acquisition of tactile images have been reported recently.
- flexible electronics,
- metal–oxide semiconductor,
- thin-film transistor,
- dual gate,
- fluorination,
- analog front-end system,
- sensors

^§Runxiao Shi and Tengteng Lei contributed equally to this work and should be considered as co-first authors.

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References

[1]	Zhu Y, He Y L, Jiang S S, et al. Indium–gallium–zinc–oxide thin-film transistors: Materials, devices, and applications. J Semicond, 2021, 42, 031101 doi: 10.1088/1674-4926/42/3/031101
[2]	Myny K, Lai Y C, Papadopoulos N, et al. A flexible ISO14443-a compliant 7.5mW 128b metal-oxide NFC barcode tag with direct clock division circuit from 13.56MHz carrier. 2017 IEEE International Solid-State Circuits Conference (ISSCC), 2017, 258 doi: 10.1109/ISSCC.2017.7870359
[3]	Fuketa H, Yoshioka K, Shinozuka Y, et al. 1µm-thickness 64-channel surface electromyogram measurement sheet with 2V organic transistors for prosthetic hand control. 2013 IEEE International Solid-State Circuits Conference Digest of Technical Papers, 2013, 104 doi: 10.1109/ISSCC.2013.6487656
[4]	Biggs J, Myers J, Kufel J, et al. A natively flexible 32-bit Arm microprocessor. Nature, 2021, 595, 532 doi: 10.1038/s41586-021-03625-w
[5]	Hosono H. How we made the IGZO transistor. Nat Electron, 2018, 1, 428 doi: 10.1038/s41928-018-0106-0
[6]	Xia Z H, Lu L, Li J P, et al. Self-aligned elevated-metal metal-oxide thin-film transistors for displays and flexible electronics. 2019 IEEE International Electron Devices Meeting (IEDM), 2020, 8.4. 1 doi: 10.1109/IEDM19573.2019.8993653
[7]	Wang S S, Shi R X, Li J P, et al. Resilience of fluorinated indium-gallium-zinc oxide thin-film transistor against hydrogen-induced degradation. IEEE Electron Device Lett, 2020, 41, 729 doi: 10.1109/LED.2020.2983789
[8]	Wang Y Q, Jiang W, Xie X Y, et al. A kinetic model for the generation and annihilation of thermally induced carrier donors in a semiconducting metal-oxide thin film. Small, 2022, 18, 2203346 doi: 10.1002/smll.202203346
[9]	Lu L, Xia Z H, Li J P, et al. A comparative study on fluorination and oxidation of indium–gallium–zinc oxide thin-film transistors. IEEE Electron Device Lett, 2018, 39, 196 doi: 10.1109/LED.2017.2781700
[10]	Li J P, Lu L, Feng Z Q, et al. An oxidation-last annealing for enhancing the reliability of indium-gallium-zinc oxide thin-film transistors. Appl Phys Lett, 2017, 110, 142102 doi: 10.1063/1.4979649
[11]	Wang S S, Shi R X, Li J P, et al. 24-2: Distinguished student paper: Fluorination for enhancing the resistance of indium-gallium-zinc oxide thin-film transistor against hydrogen-induced degradation. SID Symp Dig Tech Pap, 2020, 51, 347 doi: 10.1002/sdtp.13875
[12]	Myny K. The development of flexible integrated circuits based on thin-film transistors. Nat Electron, 2018, 1, 30 doi: 10.1038/s41928-017-0008-6
[13]	Spijkman M J, Myny K, Smits E C P, et al. Dual-gate thin-film transistors, integrated circuits and sensors. Adv Mater, 2011, 23, 3231 doi: 10.1002/adma.201101493
[14]	Lei T, Shao L L, Zheng Y Q, et al. Low-voltage high-performance flexible digital and analog circuits based on ultrahigh-purity semiconducting carbon nanotubes. Nat Commun, 2019, 10, 1 doi: 10.1038/s41467-018-07882-8
[15]	Liu F Y, Liu Z H, Gao S Y, et al. Polyimide film with low thermal expansion and high transparency by self-enhancement of polyimide/SiC nanofibers net. RSC Adv, 2018, 8, 19034 doi: 10.1039/C8RA02479K
[16]	Yung K C, Zeng D W, Yue T M. XPS investigation of Upilex-S polyimide ablated by 355 nm Nd: YAG laser irradiation. Appl Surf Sci, 2001, 173, 193 doi: 10.1016/S0169-4332(00)00884-9
[17]	Shi R X, Wang S S, Xia Z H, et al. Fluorinated metal-oxide thin-film transistors for circuit implementation on a flexible substrate. IEEE J Flex Electron, 2022, 1, 58 doi: 10.1109/JFLEX.2021.3140044
[18]	Lu L, Li J P, Kwok H S, et al. High-performance and reliable elevated-metal metal-oxide thin-film transistor for high-resolution displays. 2016 IEEE International Electron Devices Meeting (IEDM), 2017, 32.2. 1 doi: 10.1109/IEDM.2016.7838526
[19]	Xie X, Chen K, Zhou Z, et al. Conductive indium-tin-zinc-oxide formed using an oxygen plasma treatment through a silicon oxide cover layer. in Digest Tech. Papers SID'23 Conference, 2023.
[20]	Huang T C, Fukuda K, Lo C M, et al. Pseudo-CMOS: A design style for low-cost and robust flexible electronics. IEEE Trans Electron Devices, 2011, 58, 141 doi: 10.1109/TED.2010.2088127
[21]	Shi R X, Liu X C, Lei T T, et al. An integrated analog front-end system on flexible substrate for the acquisition of bio-potential signals. Adv Sci, 2023, 10, 2207683 doi: 10.1002/advs.202207683
[22]	Lei T, Hu Y, Xie X, et al. An active-matrix piezoelectric tactile sensor array with in-pixel amplifier and non-uniformity compensation. in Digest Tech. Papers Transducers'23 Conference, 2023.
[23]	Lei T T, Hu Y S, Wong M. Active-matrix tactile sensor array based on the monolithic integration of pvdf and dual-gate transistors. 2022 IEEE 35th International Conference on Micro Electro Mechanical Systems Conference (MEMS), 2022, 71 doi: 10.1109/MEMS51670.2022.9699743

Low-temperature metal–oxide thin-film transistor technologies for implementing flexible electronic circuits and systems

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