Carbon doping of WS2 monolayers: Bandgap reduction and p-type doping transport

Fu Zhang, Yanfu Lu, Daniel S. Schulman, Tianyi Zhang, Kazunori Fujisawa, Zhong Lin, Yu Lei, Ana LauraElias, Saptarshi Das, Susan B. Sinnott, Mauricio Terrones

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Chemical doping constitutes an effective route to alter the electronic, chemical, and optical properties of twodimensional transition metal dichalcogenides (2D-TMDs). We used a plasma-assisted method to introduce carbon-hydrogen (CH) units into WS2 monolayers. We found CH-groups to be the most stable dopant to introduce carbon into WS2, which led to a reduction of the optical bandgap from 1.98 to 1.83 eV, as revealed by photoluminescence spectroscopy. Aberration corrected high-resolution scanning transmission electron microscopy (AC-HRSTEM) observations in conjunction with first-principle calculations confirm that CH-groups incorporate into S vacancies within WS2. According to our electronic transport measurements, undoped WS2 exhibits a unipolar n-type conduction. Nevertheless, the CH-WS2 monolayers show the emergence of a p-branch and gradually become entirely p-type, as the carbon doping level increases. Therefore, CH-groups embedded into the WS2 lattice tailor its electronic and optical characteristics. This route could be used to dope other 2D-TMDs for more efficient electronic devices.

Original languageEnglish (US)
Article numberaav5003
JournalScience Advances
Volume5
Issue number5
DOIs
StatePublished - Jan 1 2019

Fingerprint

carbon
hydrogen
electronics
routes
chemical properties
aberration
transition metals
photoluminescence
optical properties
conduction
transmission electron microscopy
scanning electron microscopy
high resolution
spectroscopy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)
  • General

Cite this

Zhang, Fu ; Lu, Yanfu ; Schulman, Daniel S. ; Zhang, Tianyi ; Fujisawa, Kazunori ; Lin, Zhong ; Lei, Yu ; LauraElias, Ana ; Das, Saptarshi ; Sinnott, Susan B. ; Terrones, Mauricio. / Carbon doping of WS2 monolayers : Bandgap reduction and p-type doping transport. In: Science Advances. 2019 ; Vol. 5, No. 5.
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abstract = "Chemical doping constitutes an effective route to alter the electronic, chemical, and optical properties of twodimensional transition metal dichalcogenides (2D-TMDs). We used a plasma-assisted method to introduce carbon-hydrogen (CH) units into WS2 monolayers. We found CH-groups to be the most stable dopant to introduce carbon into WS2, which led to a reduction of the optical bandgap from 1.98 to 1.83 eV, as revealed by photoluminescence spectroscopy. Aberration corrected high-resolution scanning transmission electron microscopy (AC-HRSTEM) observations in conjunction with first-principle calculations confirm that CH-groups incorporate into S vacancies within WS2. According to our electronic transport measurements, undoped WS2 exhibits a unipolar n-type conduction. Nevertheless, the CH-WS2 monolayers show the emergence of a p-branch and gradually become entirely p-type, as the carbon doping level increases. Therefore, CH-groups embedded into the WS2 lattice tailor its electronic and optical characteristics. This route could be used to dope other 2D-TMDs for more efficient electronic devices.",
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Zhang, F, Lu, Y, Schulman, DS, Zhang, T, Fujisawa, K, Lin, Z, Lei, Y, LauraElias, A, Das, S, Sinnott, SB & Terrones, M 2019, 'Carbon doping of WS2 monolayers: Bandgap reduction and p-type doping transport', Science Advances, vol. 5, no. 5, aav5003. https://doi.org/10.1126/sciadv.aav5003

Carbon doping of WS2 monolayers : Bandgap reduction and p-type doping transport. / Zhang, Fu; Lu, Yanfu; Schulman, Daniel S.; Zhang, Tianyi; Fujisawa, Kazunori; Lin, Zhong; Lei, Yu; LauraElias, Ana; Das, Saptarshi; Sinnott, Susan B.; Terrones, Mauricio.

In: Science Advances, Vol. 5, No. 5, aav5003, 01.01.2019.

Research output: Contribution to journalArticle

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AU - Zhang, Fu

AU - Lu, Yanfu

AU - Schulman, Daniel S.

AU - Zhang, Tianyi

AU - Fujisawa, Kazunori

AU - Lin, Zhong

AU - Lei, Yu

AU - LauraElias, Ana

AU - Das, Saptarshi

AU - Sinnott, Susan B.

AU - Terrones, Mauricio

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Chemical doping constitutes an effective route to alter the electronic, chemical, and optical properties of twodimensional transition metal dichalcogenides (2D-TMDs). We used a plasma-assisted method to introduce carbon-hydrogen (CH) units into WS2 monolayers. We found CH-groups to be the most stable dopant to introduce carbon into WS2, which led to a reduction of the optical bandgap from 1.98 to 1.83 eV, as revealed by photoluminescence spectroscopy. Aberration corrected high-resolution scanning transmission electron microscopy (AC-HRSTEM) observations in conjunction with first-principle calculations confirm that CH-groups incorporate into S vacancies within WS2. According to our electronic transport measurements, undoped WS2 exhibits a unipolar n-type conduction. Nevertheless, the CH-WS2 monolayers show the emergence of a p-branch and gradually become entirely p-type, as the carbon doping level increases. Therefore, CH-groups embedded into the WS2 lattice tailor its electronic and optical characteristics. This route could be used to dope other 2D-TMDs for more efficient electronic devices.

AB - Chemical doping constitutes an effective route to alter the electronic, chemical, and optical properties of twodimensional transition metal dichalcogenides (2D-TMDs). We used a plasma-assisted method to introduce carbon-hydrogen (CH) units into WS2 monolayers. We found CH-groups to be the most stable dopant to introduce carbon into WS2, which led to a reduction of the optical bandgap from 1.98 to 1.83 eV, as revealed by photoluminescence spectroscopy. Aberration corrected high-resolution scanning transmission electron microscopy (AC-HRSTEM) observations in conjunction with first-principle calculations confirm that CH-groups incorporate into S vacancies within WS2. According to our electronic transport measurements, undoped WS2 exhibits a unipolar n-type conduction. Nevertheless, the CH-WS2 monolayers show the emergence of a p-branch and gradually become entirely p-type, as the carbon doping level increases. Therefore, CH-groups embedded into the WS2 lattice tailor its electronic and optical characteristics. This route could be used to dope other 2D-TMDs for more efficient electronic devices.

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Zhang F, Lu Y, Schulman DS, Zhang T, Fujisawa K, Lin Z et al. Carbon doping of WS2 monolayers: Bandgap reduction and p-type doping transport. Science Advances. 2019 Jan 1;5(5). aav5003. https://doi.org/10.1126/sciadv.aav5003