Studies of Li intercalation of hydrogenated graphene on SiC(0001)

Watcharinyanon, Somsakul; Johansson, L. I.; Zakharov, Alexei; Virojanadara, Charíya

doi:10.1016/j.susc.2011.10.023

Cited by 26 publications

(31 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The energy separation between the G and SiC 0 components has now increased to the largest value observed, 3.0 eV. In earlier investigations on Si-face graphene, [4][5][6][7]9 this increase in energy separation has been attributed to intercalation of the metal at the graphene/SiC interface, thus to a change in the interface dipole layer that increases the separation between the components. Heating at progressively higher temperatures is seen to result in a gradual decrease in the separation, which indicates a gradual reduction of Li at the interface, since the initial C 1s spectrum is essentially restored after heating at 1030 C. The corresponding set of Si 2p spectra in Fig.…”

Section: Resultsmentioning

confidence: 81%

“…In this study, the effects induced in the electronic structure of C-face graphene are investigated after depositing similar amounts of Li and after heating at similar temperatures as earlier done [4][5][6] for Si-face graphene samples. The idea was to reveal if similar effects would be induced in the band structure and core levels.…”

Section: Introductionmentioning

confidence: 99%

“…For Li (Refs. [4][5][6] and Na (Refs. 7-9) on the other hand, the metal at first also intercalates in between the carbon layers but with time also at the SiC interface, thus underneath the carbon buffer layer that forms upon growth of graphene on Si-face SiC.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Li induced effects in the core level and π-band electronic structure of graphene grown on C-face SiC

Johansson

Xia

Virojanadara

2015

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

View full text Add to dashboard Cite

Studies of the effects induced in the electronic structure after Li deposition, and subsequent heating, on graphene samples prepared on C-face SiC are reported. The as prepared graphene samples are essentially undoped, but after Li deposition, the Dirac point shifts down to 1.2 eV below the Fermi level due to electron doping. The shape of the C 1s level also indicates a doping concentration of around 1014 cm−2 after Li deposition, when compared with recent calculated results of core level spectra of graphene. The C 1s, Si 2p, and Li 1s core level results show little intercalation directly after deposition but that most of the Li has intercalated after heating at 280 °C. Heating at higher temperatures leads to desorption of Li from the sample, and at 1030 °C, Li can no longer be detected on the sample. The single π-band observable from multilayer C-face graphene samples in conventional angle resolved photoelectron spectroscopy is reasonably sharp both on the initially prepared sample and after Li deposition. After heating at 280 °C, the π-band appears more diffuse and possibly split. The Dirac point becomes located at 0.4 eV below the Fermi level, which indicates occurrence of a significant reduction in the electron doping concentration. Constant energy photoelectron distribution patterns extracted from the as prepared graphene C-face sample and also after Li deposition and heating at 280 °C look very similar to earlier calculated distribution patterns for monolayer graphene.

show abstract

Section: Resultsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Li induced effects in the core level and π-band electronic structure of graphene grown on C-face SiC

Johansson

Xia

Virojanadara

2015

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

View full text Add to dashboard Cite

show abstract

“…Small Li atoms are expected to penetrate into the interlayer space (presumably, through Svacancies in the surface layer, similarly to H atoms [26]) more readily than larger Na and K. Note that Li can be intercalated into bilayer graphene, without any pronounced distortion of the structure [27]. The DFT calculations of Young's modulus for Li-intercalated bilayer and trilayer graphene have shown that the intercalation increases the intrinsic stiffness.…”

Section: Introductionmentioning

confidence: 99%

Metallization and stiffness of the Li-intercalated MoS2 bilayer

Петрова

Yakovkin

Zeze

2015

Applied Surface Science

View full text Add to dashboard Cite

Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. The band structures, DOS, and Fermi surfaces for the MoS 2 bilayer with adsorbed (a,c,e) and intercalated (b,d,f) Li (1×1) layer. Graphical Abstract (for review)To Reviewer #1:"1. The authors showed the frequencies of phonon modes at Gamma point. In Fig. 6 -We have to confess that the relationship of the phonon frequencies at Gamma with the topic of the paper is only marginal, and therefore have canceled Table 1, Fig. 6 and Fig. 7 (with the related text), as advised. To our view, as a result, the paper has become more focused. Of course, within LDA, one cannot achieve a "chemical accuracy" of the estimates of the interlayer interaction, but for the purposes of the present study of the role of Li intercalation, it is important to use the same approximation for both (pristine and Li-intercalated) systems, and here LDA is a good choice. It should be noted in this regard that, rigorously speaking, vdW description *Response to Reviewers is valid until wave functions of species do not overlap -otherwise, the exchange interaction must be considered instead. Li concentrations, the character of metallization for the adsorbed layer substantially differs from that of the MoS 2 -Li -MoS 2 layered system. In particular, for the adsorbed (1×1) Li monolayer, the increased density of the layer leads to the nonmetal-to-metal transition, which is evident from the appearance of the band crossing E F with an upward dispersion, pertinent to simple metals. It has been demonstrated that intercalated Li substantially increases the interlayer interaction in MoS 2 .Specifically, the estimated 0.12 eV energy of the interlayer interaction in the MoS 2 bilayer increases to 0.60 eV. This result is also consistent with results of earlier DFT calculations and available experimental results for alkali-intercalated graphene layers, which have demonstrated a substantial increase in the stiffness due to intercalation of alkalis.

show abstract

“…The bonds between the buffer layer and SiC can be broken by intercalation of foreign atoms, which therefore converts the buffer layer to a monolayer graphene and opens a way to tailor its electronic properties, i.e., by doping. Intercalation of many species such as H, O, F, Au, Li, Na, Ge, Si and Yb [13][14][15][16][17][18][19][20][21][22] varied graphene doping in a wide range from n-doped to p-doped materials. Si and Ge, both from group IV, can be intercalated and effectively decouple the buffer layer from its supporting SiC substrate [19,20,23,24].…”

Section: Introductionmentioning

confidence: 99%

Metal-dielectric transition in Sn-intercalated graphene on SiC(0001)

2017

Self Cite

View full text Add to dashboard Cite

The Sn intercalation into a buffer layer graphene grown on 4H-SiC(0001) substrate has been studied with spectroscopic photoemission and low energy electron microscope. Both SnSi x and SnOx interfacial layers are found to form below the buffer layer, converting it into a quasi-freestanding monolayer graphene. Combining the various operation modes of the microscope allows a detailed insight into the formation processes of the interlayers and their thermal stability. In particular, at the interface we observed a reversible transition from silicide to oxide after exposure to ambient pressure and subsequent annealing. This metal-dielectric transition might be useful for interface engineering in graphene-based devices.

show abstract

Studies of Li intercalation of hydrogenated graphene on SiC(0001)

Cited by 26 publications

References 26 publications

Li induced effects in the core level and π-band electronic structure of graphene grown on C-face SiC

Li induced effects in the core level and π-band electronic structure of graphene grown on C-face SiC

Metallization and stiffness of the Li-intercalated MoS2 bilayer

Metal-dielectric transition in Sn-intercalated graphene on SiC(0001)

Contact Info

Product

Resources

About