Molybdenum disulfide (MoS2) semiconductors have closely been studied for potential applications in detectors, optoelectronics, and flexible electronics due to its high electrical and robust mechanical performance. Herein, the first experimental study of the high-speed ultrasound wave detection by the combinational structure of flexible MoS2 field-effect transistor (FET) and piezoelectric device based on polyvinylidene fluoride trifluoro ethylene P(VDF-TrFE) is reported. The proposed flexible MoS2 based FET device exhibits maximum mobility of 18.12 cm2 Vs−1, high on/off current ratio of ≈105, high robustness over mechanical tests, and excellent gate-pulsed switching behavior at different frequencies (10, 100, and 500 kHz), thus, utilized as supporting electronics to detect ultrasound wave at high-speed. The ultrasound waves are applied to the self-assembled piezoelectric device under different power scales (0 ≈ 1.5 W cm−2) and the transfer curve of the proposed FET is analyzed. The results show a clear detection of ultrasound waves with high stability and excellent linearity in terms of threshold voltage (Vth) shift and drain current (Ids) under different power levels. Also, the pulsed gate-switching behavior is analyzed and the ultrasound detection with high stability is observed at high-speed switching, thus, enabling the development of applications in high-speed electronic devices and biomedical imaging tools.
|Journal||Advanced Functional Materials|
|Publication status||Published - 2021 Feb 10|
Bibliographical noteFunding Information:
This research was supported in part by the National Research Foundation of Korea (2018R1A2B2003558). This work was partly funded by Ministry of Science and ICT under Nano Material Technology Development Program (2020M3H4A1A03084600) through the National Research Foundation of Korea (NRF).
© 2020 Wiley-VCH GmbH
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics