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Radiation Hardness for Silicon Oxide and Aluminum Oxide on 4H-SiC
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Kinetics Modeling of the Carbon Vacancy Thermal Equilibration in 4H-SiC
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High Resolution Optical Spectroscopy of Free Exciton and Electronic Band Structure near the Fundamental Gap in 4H SiC
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Growth Conditions and In Situ Computed Tomography Analysis of Facetted Bulk Growth of SiC Boules
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Rearrangement of Surface Structure of 4^o Off-Axis 4H-SiC (0001) Epitaxial Wafer by High Temperature Annealing in Si/Ar Ambient
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The Effects of Illumination on Point Defects Detected in High Purity Semi-Insulating 4H-SiC
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Effect of Electron Irradiation on Electrical and Electroluminescent Properties of n⁺p 4H-SiC Structures
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HomeMaterials Science ForumMaterials Science Forum Vol. 924High Resolution Optical Spectroscopy of Free...

High Resolution Optical Spectroscopy of Free Exciton and Electronic Band Structure near the Fundamental Gap in 4H SiC

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Abstract:

We use thick, relatively high purity 4H SiC boule material to measure the wavelength modulated absorption spectrum with improved wavelength resolution and sensitivity with respect to previous work. We observe several small 0.6 ± 0.1 meV splittings, which we attribute to electron mass anisotropy and electron-hole exchange interaction. In addition, we identify several features in the absorption spectrum as signatures of nonparabolicity in the free exciton dispersion relations, the primary origin of which is likely the nonparabolic energy dispersion of the valence bands, as revealed by published band structure calculations based on density functional theory.

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Silicon Carbide and Related Materials 2017

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Periodical:

Materials Science Forum (Volume 924)

Pages:

239-244

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.924.239

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Online since:

June 2018

Authors:

Walter M. Klahold, Wolfgang J. Choyke, Robert P. Devaty*

Keywords:

Band Structure, Electron-Hole Exchange, Free Exciton, Mass Anisotropy, Nonparabolicity, Spin-Orbit Splitting, Wavelength Modulated Absorption

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[1] W. J. Choyke, L. Patrick, and D. R. Hamilton, Proc. 7th Int. Conf. Phys. Semiconductors (Dunod, Paris, 1964) 751-758.

[2] W. J. Choyke, R. P. Devaty, and S. G. Sridhara, Phys. Scripta T79 (1999) 9.

[3] S. G. Sridhara, S. Bai, O. Shigiltchoff, R. P. Devaty, and W. J. Choyke, Mater. Sci. Forum 338-342 (2000) 567.

DOI: 10.4028/www.scientific.net/msf.338-342.567

[4] W. R. L. Lambrecht, S. Limpijumnong, S. N. Rashkeev, and B. Segall, Phys. Status Solidi B 202 (1997) 5.

[5] C. Persson and U. Lindefelt, J. Appl. Phys. 82 (1997) 5496.

[6] G. Wellenhofer and U. Rössler, Phys. Status Solidi B 202 (1997) 107.

[7] R. J. Elliott, Phys. Rev. 108 (1957) 1384.

[8] N. O. Lipari and M. Altarelli, Phys. Rev. B 15 (1977) 4883.

[9] G. F. Koster, J. O. Dimmock, R. G. Wheeler, and H. Statz, Properties of Thirty-Two Point Groups, MIT Press, Cambridge, MA, (1963).

[10] K. L. Shaklee and J. E. Rowe, Appl. Opt. 9 (1970) 627.

[11] S.G. Sridhara, T.J. Eperjesi, R.P. Devaty and W.J. Choyke, Mater. Sci. Eng. B 61-62 (1999) 229.

[12] J. Serrano, J. Strempfer, M. Cardona, M. Schwoerer-Böhning, H. Requardt, M. Lorenzen, B. Stojetz, P. Pavone, and W. J. Choyke, Mater. Sci. Forum 433-436 (2003) 257.

DOI: 10.4028/www.scientific.net/msf.433-436.257

[13] W. J. Choyke, R. P. Devaty, L. L. Clemen, M. F. MacMillan, M. Yoganathan, and G. Pensl, Inst. Phys. Conf. Ser. 142 (1996) 257.

[14] I. G. Ivanov, U. Lindefelt, A. Henry, O. Kordina, C. Hallin, M. Aroyo, T. Egilsson, and E. Janzén, Phys. Rev. B 58 (1998) 13634.

DOI: 10.1103/physrevb.58.13634

[15] I. S. Gorban, V. A. Gubanov, V. G. Lysenko, A. A. Pletyushkin, and V. B. Timofeev, Fiz. Tverd. Tela 26 (1984) 2282 [Sov. Phys. Solid State 26 (1984) 1385].

[16] A. Frova, G. A. Thomas, R. E. Miller, and E. O. Kane, Phys. Rev. Lett. 34 (1975) 1572.

[17] M. Altarelli and N. O. Lipari, Phys. Rev. Lett. 36 (1976) 619.