2021학년도 2학기 물리학과 세미나를 안내해 드립니다.
– 연사: 오홍석 교수(숭실대학교 물리학과)
– 제목: An analytical model for dual gate ZnO TFTs with field-tunable piezoelectric responses
– 초록:
The recent development of zinc oxide (ZnO) piezoelectric thin film transistors (TFTs) has paved the way to fabricate high-density force sensor arrays that utilize the TFT as both a switch and a force sensor. This dual functionality enables building active-matrix force sensor arrays combining the performance merit of the active-matrix structure with the merit of a cost-effective simple device architecture. Despite the successful demonstrations of active piezoelectric devices in force sensor applications, however, their responsivity has been only qualitatively described by modulation of the energy band-edge profiles.The lack of an analytical model hinders the quantitative prediction of piezoelectric device response to external forces.
In this presentation, the fabrication and characterization of dual-gated piezoelectric TFTs along with an analytical model that accurately predicts the current modulation and force responses for independently biased gate electrodes will be introduced. To understand the force response of the TFT, a simplified 1D charge distribution model was used to calculate the shift in the band-edge profiles induced by the piezoelectric charges, and accounts for surface accumulation and bulk channels. Finally, the response amplitude and polarity were shown to strongly correlate with the biasing regime defined by the gate voltages on both sides of the channel and with the quality of the material at either interface.
– 일시: 9월 9일 오후 4시 30분
– 장소: 온라인(접속링크: https://ssu-ac-kr.zoom.us/j/83265012552)
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