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Tuning Excitonic Properties of Monolayer MoS 2 with Microsphere Cavity by High‐Throughput Chemical Vapor Deposition Method
Author(s) -
Mi Yang,
Zhang Zhepeng,
Zhao Liyun,
Zhang Shuai,
Chen Jie,
Ji Qingqing,
Shi Jianping,
Zhou Xiebo,
Wang Rui,
Shi Jia,
Du Wenna,
Wu Zhiyong,
Qiu Xiaohui,
Zhang Qing,
Zhang Yanfeng,
Liu Xinfeng
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201701694
Subject(s) - materials science , photoluminescence , whispering gallery wave , optoelectronics , femtosecond , chemical vapor deposition , semiconductor , monolayer , spectroscopy , refractive index , purcell effect , absorption (acoustics) , exciton , laser , resonator , spontaneous emission , optics , nanotechnology , physics , quantum mechanics , composite material
Tuning the optical properties of 2D direct bandgap semiconductors is crucial for applications in photonic light source, optical communication, and sensing. In this work, the excitonic properties of molybdenum disulphide (MoS 2 ) are successfully tuned by directly depositing it onto silica microsphere resonators using chemical vapor deposition method. Multiple whispering gallery mode (WGM) peaks in the emission wavelength range of ≈650–750 nm are observed under continuous wave excitation at room temperature. Time‐resolved photoluminescence (TRPL) and femtosecond transient absorption (TA) spectroscopy are conducted to study light‐matter interaction dynamics of the MoS 2 microcavities. TRPL study suggests radiative recombination rate of carrier‐phonon scattering and interband transition processes in MoS 2 is enhanced by a factor of ≈1.65 due to Purcell effect in microcavities. TA spectroscopy study shows modulation of the interband transition process mainly occurs at PB‐A band with an estimated F ≈ 1.60. Furthermore, refractive index sensing utilizing WGM peaks of MoS 2 is established with sensitivity up to ≈150 nm per refractive index unit. The present work provides a large‐scale and straightforward method for coupling atomically thin 2D gain media with cavities for high‐performance optoelectronic devices and sensors.