Vacuum level dependent photoluminescence in chemical vapor deposition-grown monolayer MoS 2

Linfeng Sun; Xiaoming Zhang; Fucai Liu; Youde Shen; Xiaofeng Fan; Shoujun Zheng; John T.L. Thong; Zheng Liu; Shengyuan A. Yang; Hui Ying Yang

doi:10.1038/s41598-017-15577-1

Vacuum level dependent photoluminescence in chemical vapor deposition-grown monolayer MoS ₂

Linfeng Sun, Xiaoming Zhang, Fucai Liu, Youde Shen, Xiaofeng Fan, Shoujun Zheng, John T.L. Thong, Zheng Liu, Shengyuan A. Yang, Hui Ying Yang^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

The stronger photoluminescence (PL) in chemical vapor deposition (CVD) grown monolayer MoS₂ has been attributed to its high crystal quality compared with that in mechanically exfoliated (ME) crystal, which is contrary to the cognition that the ME crystal usually have better crystal quality than that of CVD grown one and it is expected with a better optical quality. In this report, the reason of abnormally strong PL spectra in CVD grown monolayer crystal is systematically investigated by studying the in-situ opto-electrical exploration at various environments for both of CVD and ME samples. High resolution transmission electron microscopy is used to investigate their crystal qualities. The stronger PL in CVD grown crystal is due to the high p-doping effect of adsorbates induced rebalance of exciton/trion emission. The first principle calculations are carried out to explore the interaction between adsorbates in ambient and defects sites in MoS₂, which is consistent to the experimental phenomenon and further confirm our proposed mechanisms.

Original language	English
Article number	16714
Journal	Scientific Reports
Volume	7
Issue number	1
DOIs	https://doi.org/10.1038/s41598-017-15577-1
Publication status	Published - 1 Dec 2017
Externally published	Yes

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title = "Vacuum level dependent photoluminescence in chemical vapor deposition-grown monolayer MoS 2",

abstract = "The stronger photoluminescence (PL) in chemical vapor deposition (CVD) grown monolayer MoS2 has been attributed to its high crystal quality compared with that in mechanically exfoliated (ME) crystal, which is contrary to the cognition that the ME crystal usually have better crystal quality than that of CVD grown one and it is expected with a better optical quality. In this report, the reason of abnormally strong PL spectra in CVD grown monolayer crystal is systematically investigated by studying the in-situ opto-electrical exploration at various environments for both of CVD and ME samples. High resolution transmission electron microscopy is used to investigate their crystal qualities. The stronger PL in CVD grown crystal is due to the high p-doping effect of adsorbates induced rebalance of exciton/trion emission. The first principle calculations are carried out to explore the interaction between adsorbates in ambient and defects sites in MoS2, which is consistent to the experimental phenomenon and further confirm our proposed mechanisms.",

author = "Linfeng Sun and Xiaoming Zhang and Fucai Liu and Youde Shen and Xiaofeng Fan and Shoujun Zheng and Thong, {John T.L.} and Zheng Liu and Yang, {Shengyuan A.} and Yang, {Hui Ying}",

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doi = "10.1038/s41598-017-15577-1",

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AU - Sun, Linfeng

AU - Zhang, Xiaoming

AU - Liu, Fucai

AU - Shen, Youde

AU - Fan, Xiaofeng

AU - Zheng, Shoujun

AU - Thong, John T.L.

AU - Liu, Zheng

AU - Yang, Shengyuan A.

AU - Yang, Hui Ying

PY - 2017/12/1

Y1 - 2017/12/1

N2 - The stronger photoluminescence (PL) in chemical vapor deposition (CVD) grown monolayer MoS2 has been attributed to its high crystal quality compared with that in mechanically exfoliated (ME) crystal, which is contrary to the cognition that the ME crystal usually have better crystal quality than that of CVD grown one and it is expected with a better optical quality. In this report, the reason of abnormally strong PL spectra in CVD grown monolayer crystal is systematically investigated by studying the in-situ opto-electrical exploration at various environments for both of CVD and ME samples. High resolution transmission electron microscopy is used to investigate their crystal qualities. The stronger PL in CVD grown crystal is due to the high p-doping effect of adsorbates induced rebalance of exciton/trion emission. The first principle calculations are carried out to explore the interaction between adsorbates in ambient and defects sites in MoS2, which is consistent to the experimental phenomenon and further confirm our proposed mechanisms.

AB - The stronger photoluminescence (PL) in chemical vapor deposition (CVD) grown monolayer MoS2 has been attributed to its high crystal quality compared with that in mechanically exfoliated (ME) crystal, which is contrary to the cognition that the ME crystal usually have better crystal quality than that of CVD grown one and it is expected with a better optical quality. In this report, the reason of abnormally strong PL spectra in CVD grown monolayer crystal is systematically investigated by studying the in-situ opto-electrical exploration at various environments for both of CVD and ME samples. High resolution transmission electron microscopy is used to investigate their crystal qualities. The stronger PL in CVD grown crystal is due to the high p-doping effect of adsorbates induced rebalance of exciton/trion emission. The first principle calculations are carried out to explore the interaction between adsorbates in ambient and defects sites in MoS2, which is consistent to the experimental phenomenon and further confirm our proposed mechanisms.

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Vacuum level dependent photoluminescence in chemical vapor deposition-grown monolayer MoS ₂

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