Light-induced persistent resonance frequency shift of MoS2 mechanical resonator. (23rd February 2021)

• Record Type: Journal Article
• Authors: Inoue, Taichi; Saito, Tetsuki; Takei, Kuniharu; Arie, Takayuki; Miyata, Yasumitsu; Akita, Seiji
• Is Part Of: Applied physics express. Volume 14:Number 3(2021)
• Publication Date: 2021-02-23
• Subjects: atomically thin materials -- transition metal dichalcogenides -- nano-electro-mechanical system -- persistent photoconductivity -- nano-mechanical resonators; Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.35848/1882-0786/abe289
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: We investigate light-induced persistent resonance frequency shift on MoS2 mechanical resonators towards optically tunable nano-electro-mechanical systems with optical memory function. After the termination of light irradiation, the resonance frequency shifts downwards and the downshift is maintained for more than 20 min. This behavior is induced by trapped photogenerated holes at defects or contamination on MoS2 similar to the persistent photoconductivity. The trapped holes screen the electrostatic force acting on MoS2, which results in the reduction of the tension of MoS2 . The downshift can be eliminated by applying the excess voltage pulse to MoS2 to induce Joule heating.