期刊
NANO LETTERS
卷 16, 期 2, 页码 849-855出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b02826
关键词
Two-dimensional materials; MoS2; surface acoustic waves; photoluminesence; exciton; trion; piezoelectricity
类别
资金
- Australian Research Council Discovery Project [DP140100805, DP150103837, FL120100038]
- RMIT University
- Australian Research Council DECRA [DE140101555]
- Australian Research Council [FT130100672]
- Australian Research Council [DE140101555, FT130100672] Funding Source: Australian Research Council
By exploiting the very recent discovery of the piezoelectricity in odd-numbered layers of two-dimensional molybdenum disulfide (MoS2), we show the possibility of reversibly tuning the photoluminescence of single and odd-numbered multilayered MoS2 using high frequency sound wave coupling. We observe a strong quenching in the photoluminescence associated with the dissociation and spatial separation of electrons holes quasi-particles at low applied acoustic powers. At the same applied powers, we note a relative preference for ionization of trions into excitons. This work also constitutes the first visual presentation of the surface displacement in one-layered MoS2 using laser Doppler vibrometry. Such observations are associated with the acoustically generated electric field arising from the piezoelectric nature of MoS2 for odd-numbered layers. At larger applied powers, the thermal effect dominates the behavior of the two-dimensional flakes. Altogether, the work reveals several key fundamentals governing acousto-optic properties of odd-layered MoS2 that can be implemented in future optical and electronic systems.
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