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iCANXTalks Vol. 52 ︱Piezotronics and Piezo-phototronics of the Third Generation Semiconductors

MAY . 21 2021
Theme: Piezotronics and Piezo-phototronics of the Third Generation Semiconductors

Time: May 21,2021, 20:00-21:30 (Beijing)

Zhonglin Wang  (Beijing Institute of Nanoenergy and Nanosystems)

Website for live show and replay: talks.ican-x.com

Piezoelectricity, a phenomenon known for centuries, is an effect that is about the production of electrical potential in a substance as the pressure on it changes. For wurtzite structures such as ZnO, GaN, InN and ZnS, due to the polarization of ions in a crystal that has non-central symmetry, a piezoelectric potential (piezopotential) is created in the crystal by applying a stress. The effect of piezopotential to the transport behavior of charge carriers is significant due to their multiple functionalities of piezoelectricity, semiconductor and photon excitation. By utilizing the advantages offered by these properties, a few new fields have been created. Electronics fabricated by using inner-crystal piezopotential as a “gate” voltage to tune/control the charge transport behavior is named piezotronics, with applications in strain/force/pressure triggered/controlled electronic devices, sensors and logic units. This effect was also extended to 2D materials such as MoS2. The objective of this talk is to introduce the fundamentals of piezotronics and their application for robotics and human-machine interfacing.