Substrate doping effects on Raman spectrum of epitaxial graphene on SiC

In this paper, we reported a Raman scattering study of epitaxial graphene on different doped 6H-SiC (0001) substrates and investigated the substrate induced charge-transfer doping to the epitaxial graphene. We found that the charge carrier type and concentration of epitaxial graphene can be altered by SiC substrates with different doping level and doping type. This effect is comparable to that obtained by electrochemical doping. As Raman scattering is very sensitive to the doping level, the charge carrier concentration of epitaxial graphene can be estimated by the Raman G-peak shift. Our results are fundamental and may have implications for future epitaxial-graphene-based micro/nanoelectronic devices.

[1]  Wei Chen,et al.  Surface transfer p-type doping of epitaxial graphene. , 2007, Journal of the American Chemical Society.

[2]  K. Novoselov,et al.  Raman Fingerprint of Charged Impurities in Graphene , 2007, 0709.2566.

[3]  K. Emtsev,et al.  Schottky barrier between 6H-SiC and graphite: Implications for metal/SiC contact formation , 2006 .

[4]  M. Potemski,et al.  Few-layer graphene on SiC, pyrolitic graphite, and graphene: A Raman scattering study , 2007, 0709.2538.

[5]  K. Novoselov,et al.  Born-Oppenheimer Breakdown in Graphene , 2006, cond-mat/0611714.

[6]  Klaus Kern,et al.  Atomic hole doping of graphene. , 2008, Nano letters.

[7]  Peter Sutter,et al.  Epitaxial graphene: How silicon leaves the scene. , 2009, Nature materials.

[8]  M. Dresselhaus,et al.  Studying disorder in graphite-based systems by Raman spectroscopy. , 2007, Physical chemistry chemical physics : PCCP.

[9]  Francesco Mauri,et al.  Kohn anomalies and electron-phonon interactions in graphite. , 2004, Physical review letters.

[10]  Klaus von Klitzing,et al.  Raman spectra of epitaxial graphene on SiC and of epitaxial graphene transferred to SiO2. , 2008, Nano letters.

[11]  H. R. Krishnamurthy,et al.  Monitoring dopants by Raman scattering in an electrochemically top-gated graphene transistor. , 2008, Nature nanotechnology.

[12]  M. Lazzeri,et al.  Nonadiabatic Kohn anomaly in a doped graphene monolayer. , 2006, Physical review letters.

[13]  N. Marzari,et al.  Uniaxial Strain in Graphene by Raman Spectroscopy: G peak splitting, Gruneisen Parameters and Sample Orientation , 2008, 0812.1538.

[14]  A. Ferrari,et al.  Raman spectroscopy of graphene and graphite: Disorder, electron phonon coupling, doping and nonadiabatic effects , 2007 .

[15]  J. Robertson,et al.  Interpretation of Raman spectra of disordered and amorphous carbon , 2000 .

[16]  K. Novoselov,et al.  Breakdown of the adiabatic Born-Oppenheimer approximation in graphene. , 2007, Nature materials.

[17]  Taisuke Ohta,et al.  Interlayer interaction and electronic screening in multilayer graphene investigated with angle-resolved photoemission spectroscopy. , 2006, Physical review letters.

[18]  W. D. de Heer,et al.  The growth and morphology of epitaxial multilayer graphene , 2008 .

[19]  Alexander Mattausch,et al.  Ab initio study of graphene on SiC. , 2007, Physical review letters.

[20]  D. B. Fischbach,et al.  New Lines in the Raman Spectra of Carbons and Graphite , 1978 .

[21]  Structural properties of the multilayer graphene/4H-SiC(0001) system as determined by surface x-ray diffraction , 2007, cond-mat/0702540.

[22]  P. Kim,et al.  Electric field effect tuning of electron-phonon coupling in graphene. , 2006, Physical review letters.

[23]  Ying Ying Wang,et al.  Uniaxial strain on graphene: Raman spectroscopy study and band-gap opening. , 2008, ACS nano.

[24]  K. Emtsev,et al.  Effect of an intermediate graphite layer on the electronic properties of metal/SiC contacts , 2008 .

[25]  H. B. Weber,et al.  Towards wafer-size graphene layers by atmospheric pressure graphitization of silicon carbide. , 2009, Nature materials.

[26]  F. Tuinstra,et al.  Raman Spectrum of Graphite , 1970 .

[27]  Andre K. Geim,et al.  Raman spectrum of graphene and graphene layers. , 2006, Physical review letters.

[28]  C. Berger,et al.  Epitaxial graphene , 2007, 0704.0285.

[29]  C. Keast,et al.  Epitaxial Graphene Transistors on SiC Substrates , 2008, IEEE Transactions on Electron Devices.

[30]  Linear and non-linear optical experiments based on macroporous silicon photonic crystals , 2007 .

[31]  X. F. Fan,et al.  Raman spectroscopy of epitaxial graphene on a SiC substrate , 2008 .

[32]  Ralf Graupner,et al.  Raman spectra of epitaxial graphene on SiC(0001) , 2008 .

[33]  P. D. Ye,et al.  Top-gated graphene field-effect-transistors formed by decomposition of SiC , 2008, 0802.4103.

[34]  Michael G. Spencer,et al.  Thickness Estimation of Epitaxial Graphene on SiC Using Attenuation of Substrate Raman Intensity , 2009 .