F4-TCNQ on Epitaxial Bi-Layer Graphene: Concentration- and Orientation-Dependent Charge Transfer at the Interface

Research output: Contribution to journalArticleResearchpeer review

Authors

  • Sudeshna Chattopadhyay
  • Vikas Munya
  • Ravinder Kumar
  • Dipayan Pal
  • Sucheta Bandyopadhyay
  • Arpan Ghosh
  • Priyanka Yogi
  • Julian Koch
  • Herbert Pfnür

Research Organisations

External Research Organisations

  • Indian Institute of Technology Indore (IITI)
  • Indian Statistical Institute
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Details

Original languageEnglish
Pages (from-to)16067-16072
Number of pages6
JournalLANGMUIR
Volume38
Issue number51
Early online date13 Dec 2022
Publication statusPublished - 27 Dec 2022

Abstract

Bi-layer epitaxial graphene (BLG) on 6H-SiC(0001) (EG/SiC) was grown and modified by thermal deposition of the molecular electron acceptor tetrafluoro-tetra cyano quinodimethane (F4-TCNQ). The surface-modified system, F4-TCNQ/EG/SiC, was studied by X-ray photoelectron spectroscopy (XPS) and angle-resolved polarized Raman spectroscopy (ARPRS). XPS results indicate that bonding of deposited F4-TCNQ molecules depends on their concentration. Although bonding through the cyano groups is present at all concentrations, charge transfer from graphene to fluorine is evident only at sub-monolayer concentrations. The corresponding change in bond character is coupled with a change in molecular orientation. Raman spectroscopy not only provides results consistent with the findings from the XPS study but also reveals a significant degree of molecular stacking above the monolayer concentration. Thus, both the variation of the acceptor concentration and the number of graphene layers provide further handles to manipulate charge and doping that may be useful in device applications.

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Cite this

F4-TCNQ on Epitaxial Bi-Layer Graphene: Concentration- and Orientation-Dependent Charge Transfer at the Interface. / Chattopadhyay, Sudeshna; Munya, Vikas; Kumar, Ravinder et al.
In: LANGMUIR, Vol. 38, No. 51, 27.12.2022, p. 16067-16072.

Research output: Contribution to journalArticleResearchpeer review

Chattopadhyay, S, Munya, V, Kumar, R, Pal, D, Bandyopadhyay, S, Ghosh, A, Yogi, P, Koch, J & Pfnür, H 2022, 'F4-TCNQ on Epitaxial Bi-Layer Graphene: Concentration- and Orientation-Dependent Charge Transfer at the Interface', LANGMUIR, vol. 38, no. 51, pp. 16067-16072. https://doi.org/10.1021/acs.langmuir.2c02676
Chattopadhyay, S., Munya, V., Kumar, R., Pal, D., Bandyopadhyay, S., Ghosh, A., Yogi, P., Koch, J., & Pfnür, H. (2022). F4-TCNQ on Epitaxial Bi-Layer Graphene: Concentration- and Orientation-Dependent Charge Transfer at the Interface. LANGMUIR, 38(51), 16067-16072. https://doi.org/10.1021/acs.langmuir.2c02676
Chattopadhyay S, Munya V, Kumar R, Pal D, Bandyopadhyay S, Ghosh A et al. F4-TCNQ on Epitaxial Bi-Layer Graphene: Concentration- and Orientation-Dependent Charge Transfer at the Interface. LANGMUIR. 2022 Dec 27;38(51):16067-16072. Epub 2022 Dec 13. doi: 10.1021/acs.langmuir.2c02676
Chattopadhyay, Sudeshna ; Munya, Vikas ; Kumar, Ravinder et al. / F4-TCNQ on Epitaxial Bi-Layer Graphene : Concentration- and Orientation-Dependent Charge Transfer at the Interface. In: LANGMUIR. 2022 ; Vol. 38, No. 51. pp. 16067-16072.
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title = "F4-TCNQ on Epitaxial Bi-Layer Graphene: Concentration- and Orientation-Dependent Charge Transfer at the Interface",
abstract = "Bi-layer epitaxial graphene (BLG) on 6H-SiC(0001) (EG/SiC) was grown and modified by thermal deposition of the molecular electron acceptor tetrafluoro-tetra cyano quinodimethane (F4-TCNQ). The surface-modified system, F4-TCNQ/EG/SiC, was studied by X-ray photoelectron spectroscopy (XPS) and angle-resolved polarized Raman spectroscopy (ARPRS). XPS results indicate that bonding of deposited F4-TCNQ molecules depends on their concentration. Although bonding through the cyano groups is present at all concentrations, charge transfer from graphene to fluorine is evident only at sub-monolayer concentrations. The corresponding change in bond character is coupled with a change in molecular orientation. Raman spectroscopy not only provides results consistent with the findings from the XPS study but also reveals a significant degree of molecular stacking above the monolayer concentration. Thus, both the variation of the acceptor concentration and the number of graphene layers provide further handles to manipulate charge and doping that may be useful in device applications.",
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T1 - F4-TCNQ on Epitaxial Bi-Layer Graphene

T2 - Concentration- and Orientation-Dependent Charge Transfer at the Interface

AU - Chattopadhyay, Sudeshna

AU - Munya, Vikas

AU - Kumar, Ravinder

AU - Pal, Dipayan

AU - Bandyopadhyay, Sucheta

AU - Ghosh, Arpan

AU - Yogi, Priyanka

AU - Koch, Julian

AU - Pfnür, Herbert

N1 - Funding Information: We acknowledge support from the Deutsche Akademischer Austauschdienst (DAAD) who funded the project under the “A New Passage to India” program between Leibniz Universität Hannover and Indian Institute of Technology Indore. We would also like to acknowledge Project No. SR/FST/PSI/225/2016 under the FIST program of the DST, Government of India, for Raman characterization facility. This work is partially supported by the Science and Engineering Research Board (SERB), India Project No: CRG/2020/005595. V.M. is thankful to CSIR-UGC, New Delhi, under the UGC-Ref. No.: 1364/(CSIR-UGC NET JUNE 2018), and R.K. is thankful to DST-INDIA, New Delhi, under the Award No. IF190536 for providing the fellowships.

PY - 2022/12/27

Y1 - 2022/12/27

N2 - Bi-layer epitaxial graphene (BLG) on 6H-SiC(0001) (EG/SiC) was grown and modified by thermal deposition of the molecular electron acceptor tetrafluoro-tetra cyano quinodimethane (F4-TCNQ). The surface-modified system, F4-TCNQ/EG/SiC, was studied by X-ray photoelectron spectroscopy (XPS) and angle-resolved polarized Raman spectroscopy (ARPRS). XPS results indicate that bonding of deposited F4-TCNQ molecules depends on their concentration. Although bonding through the cyano groups is present at all concentrations, charge transfer from graphene to fluorine is evident only at sub-monolayer concentrations. The corresponding change in bond character is coupled with a change in molecular orientation. Raman spectroscopy not only provides results consistent with the findings from the XPS study but also reveals a significant degree of molecular stacking above the monolayer concentration. Thus, both the variation of the acceptor concentration and the number of graphene layers provide further handles to manipulate charge and doping that may be useful in device applications.

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