Interfacial optical sensing of ferroelectricity in freestanding perovskite oxides with monolayer Transition Metal Dichalcogenides
ORAL
Abstract
In this work, we integrate monolayer MoSe2 with a free-standing BaTiO3 (BTO) membrane and study the ferroelectricity induced PL modulation in WSe2. Two-dimensional (2D) transition-metal dichalcogenides (TMDs) can be easily integrated with other functional materials due to their lack of dangling bonds. Also, owing to their atomic thickness, electronic and photoluminescence (PL) properties of 2D TMDs can be modulated by external perturbations, which opens new avenues for quantum sensing and tunable optoelectronic devices [1,2,3]. Recent studies show that BTO can be separated from its oxide substrate using a sacrificial oxide layer, which opens new opportunities in material integration [4,5]. Using this method, we fabricated a dual gate field effect device where the BTO polarization can be switched and sensed simultaneously with monolayer MoSe2 in-situ. We observe that the relative density of charge carriers in MoSe2 changes as the polarization switches, and this gives rise to PL intensity modulation. The relative emission intensity of neutral and charged excitons show gate dependent hysteresis, which confirms that MoSe2 senses and optically reads out the ferroelectricity in BTO.
*This work is supported by AFOSR MURI (FA9550-18-1-0480).
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Publication: [1]Chen, J. et al, Nat Commun 9, 3143 (2018)
[2]Li, T. et al, Nano Lett 17, 2, 922-927 (2017)
[3]Mao, X. et al, ACS Appl. Mater. Interfaces 13, 20, 24250–24257 (2021)
[4]Lu, D. et al, Nature Mater 15, 1255-1260 (2016)
[5]Salles, P. et al, Adv. Mater. Interfaces 8, 2001643 (2021)
Presenters
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Jaehong Choi
- Cornell University