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Probing the intrinsic optical quality of CVD grown MoS2

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Abstract

Optical emission efficiency of two-dimensional layered transition metal dichalcogenides (TMDs) is one of the most important parameters affecting their optoelectronic performance. The optimization of the growth parameters by chemical vapor deposition (CVD) to achieve optoelectronic-grade quality TMDs is, therefore, highly desirable. Here, we present a systematic photoluminescence (PL) spectroscopic approach to assess the intrinsic optical and crystalline quality of CVD grown MoS2 (CVD MoS2). We propose the use of the intensity ratio between the PL measured in air and vacuum as an effective way to monitor the intrinsic optical quality of CVD MoS2. Low-temperature PL measurements are also used to evaluate the structural defects in MoS2, via defect-associated bound exciton emission, which well correlates with the field-effect carrier mobility of MoS2 grown at different temperatures. This work therefore provides a sensitive, noninvasive method to characterize the optical properties of TMDs, allowing the tuning of the growth parameters for the development of optoelectronic devices.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (Nos. 61422503, 21541013, and 61376104), Natural Science Foundation of Jiangsu Province (No. BK20150596), the open research funds of Key Laboratory of MEMS of Ministry of Education (SEU, China), and the Fundamental Research Funds for the Central Universities.

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Authors and Affiliations

  1. Department of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing, 211189, China

    Amina Zafar, Haiyan Nan, Zhangting Wu, Jie Jiang & Zhenhua Ni

  2. Ordered Matter Science Research Center, Southeast University, Nanjing, 211189, China

    Zainab Zafar & Yumeng You

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  1. Amina Zafar
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  2. Haiyan Nan
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  3. Zainab Zafar
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  4. Zhangting Wu
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  5. Jie Jiang
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  6. Yumeng You
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  7. Zhenhua Ni
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Correspondence to Yumeng You or Zhenhua Ni.

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These authors contributed equally to this work.

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Zafar, A., Nan, H., Zafar, Z. et al. Probing the intrinsic optical quality of CVD grown MoS2 . Nano Res. 10, 1608–1617 (2017). https://doi.org/10.1007/s12274-016-1319-z

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  • DOI: https://doi.org/10.1007/s12274-016-1319-z

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