Z H Yang, G L Liu, Y D Qu, R D Li. First-principle study on energy gap of CNT superlattice structure[J]. J. Semicond., 2015, 36(10): 102002. doi: 10.1088/1674-4926/36/10/102002.
Zhonghua Yang 1, 2, , Guili Liu 1, , Yingdong Qu 2, and Rongde Li 2,
Abstract: By using the CASTEP modules based on density functional theory, the electronic structures of B/N pair co-doping (5, 5) CNT rings superlattice have been investigated.The calculation results show that the formation energies of B/N pair co-doping CNT rings are negative, indicating that the new type construction will probably be stable.The band structure and state density of the new type construction show that the energy gap is opened by B/N co-doping in (5, 5) metallic CNT and the metallic CNT is changed into a semiconductor.The energy gap of pure CNT is strongly sensitive to the changes of CNT diameter but the energy gap of B/N co-doping CNT rings remains stable when the diameters are in a reasonable scope, which means that the requirements for the production of CNT have been reduced.The compressive deformation effects mean that the energy gaps are narrowed, which is equivalent to enhancing the doping volume concentration.However, the changes of the energy gap under the tensile deformation effect are opposite.Achieving control of the electrical conductivity of CNT has an important significance for electron devices.
Key words: carbon nanotube, doping, density functional theory, electrical conductivity
Abstract: By using the CASTEP modules based on density functional theory, the electronic structures of B/N pair co-doping (5, 5) CNT rings superlattice have been investigated.The calculation results show that the formation energies of B/N pair co-doping CNT rings are negative, indicating that the new type construction will probably be stable.The band structure and state density of the new type construction show that the energy gap is opened by B/N co-doping in (5, 5) metallic CNT and the metallic CNT is changed into a semiconductor.The energy gap of pure CNT is strongly sensitive to the changes of CNT diameter but the energy gap of B/N co-doping CNT rings remains stable when the diameters are in a reasonable scope, which means that the requirements for the production of CNT have been reduced.The compressive deformation effects mean that the energy gaps are narrowed, which is equivalent to enhancing the doping volume concentration.However, the changes of the energy gap under the tensile deformation effect are opposite.Achieving control of the electrical conductivity of CNT has an important significance for electron devices.
Key words:
carbon nanotube, doping, density functional theory, electrical conductivity
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Rassato J, Baierle R J, Orellana W. Stability and electronic properties of vacancies and antisites in BC2N nanotubes[J]. Phys Rev B, 2007, 75(23): 5401. |
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Schrodinge E. An undulatory theory of the mechanics of atoms and molecules[J]. Phys Rev, 1926, 28(6): 1049. |
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Philip J H, Keith R, Matt I J P. Density functional theory in the solid state[J]. Phil Trans R Soc A, 2014, 372: 20130270. |
[11] |
Perdew J P, Wang Y. Accurate and simple analytic representation of the electron-gas correlation energy[J]. Phys Rev B, 1992, 45(23): 13244. |
[12] |
Vanderbilt D. Soft self-consistent pseudopotentials in a generalized eigenvalue formalism[J]. Phys Rev B, 1990, 41(11): 7892. |
[13] |
Monkhorst H J, Pack J D. Special points for Brillouin-zone integrations[J]. Phys Rev B, 1976, 13(12): 5188. |
[14] |
Yang K, Wang Y F, Zhou Q. Density functional theory study on the energy gap and electronic structure of armchair carbon nanotube[J]. J Mater Sin Eng, 2013, 31(5): 748. |
[1] |
Iijima S. Helical microtubules of graphitic carbon[J]. Nature, 1991, 354(6348): 56. |
[2] |
Song J X, Yang Y T, Liu H X. Electronic transport properties of the armchair silicon carbide nanotube[J]. Journal of Semiconductors, 2010, 31(11): 114003. |
[3] |
Wang F X, Cai X L, Yan D W. Synthesis and luminescence characteristics of ZnO nanotubes[J]. Journal of Semiconductors, 2014, 35(9): 093004. |
[4] |
Bala V, Seema K, Kumar R. Structural and electronic properties of endohedral doped SWCNTs:a DFT study[J]. Physica E, 2015, 65: 68. |
[5] |
Jiao N D, Wang Y C, Xi N. AFM based anodic oxidation and its application to oxidative cutting and welding of CNT[J]. Science in China Ser E:Tech Sci, 2009, 52(11): 3149. |
[6] |
Chen Q, Wei X L. In-situ manipulation, fabricating and measuring nanostructures inside SEM[J]. J Chin Electr Microsc Soc, 2011, 30(6): 473. |
[7] |
Knittle E, Kaner R B, Jeanloz R. High-pressure synthesis, characterization, and equation of state of cubic C-BN solid solutions[J]. Phys Rev B, 1995, 51: 12149. |
[8] |
Rassato J, Baierle R J, Orellana W. Stability and electronic properties of vacancies and antisites in BC2N nanotubes[J]. Phys Rev B, 2007, 75(23): 5401. |
[9] |
Schrodinge E. An undulatory theory of the mechanics of atoms and molecules[J]. Phys Rev, 1926, 28(6): 1049. |
[10] |
Philip J H, Keith R, Matt I J P. Density functional theory in the solid state[J]. Phil Trans R Soc A, 2014, 372: 20130270. |
[11] |
Perdew J P, Wang Y. Accurate and simple analytic representation of the electron-gas correlation energy[J]. Phys Rev B, 1992, 45(23): 13244. |
[12] |
Vanderbilt D. Soft self-consistent pseudopotentials in a generalized eigenvalue formalism[J]. Phys Rev B, 1990, 41(11): 7892. |
[13] |
Monkhorst H J, Pack J D. Special points for Brillouin-zone integrations[J]. Phys Rev B, 1976, 13(12): 5188. |
[14] |
Yang K, Wang Y F, Zhou Q. Density functional theory study on the energy gap and electronic structure of armchair carbon nanotube[J]. J Mater Sin Eng, 2013, 31(5): 748. |
Z H Yang, G L Liu, Y D Qu, R D Li. First-principle study on energy gap of CNT superlattice structure[J]. J. Semicond., 2015, 36(10): 102002. doi: 10.1088/1674-4926/36/10/102002.
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Manuscript received: 02 April 2015 Manuscript revised: Online: Published: 01 October 2015
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