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Quantum Confinement of Si Nanosphere with Radius Smaller than 1.2nm |
| ZHAO Pu-Qin1;HU Dong-Sheng2;WU Xing-Long2 |
| 1Department of Applied Physics, College of Science, Nanjing University of Technology, Nanjing 210009
2National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093 |
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| Cite this article: |
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ZHAO Pu-Qin, HU Dong-Sheng, WU Xing-Long 2005 Chin. Phys. Lett. 22 1492-1495 |
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Abstract We calculate the density of states, the squared optical matrix element along the x direction, and the band gap of Si nanosphere with radius r smaller than 1.2nm using the method of linear combination of atomic orbitals. It is shown that the quantum confinement effect of Si nanocrystals exists obviously, fulfilling E =1.92 + 0.23/r1.8, but the band gap exhibits fluctuation with nanocrystal size, which is caused by the dangling bonds of atoms in outer layers. The obtained result indicates that the surface chemical bonds have larger influence on the energy band structure of Si nanosphere when its radius is smaller than 1.2nm.
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| Keywords:
71.15.Ap
71.20.Mq
61.46.+w
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Published: 01 June 2005
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| PACS: |
71.15.Ap
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(Basis sets (LCAO, plane-wave, APW, etc.) and related methodology (scattering methods, ASA, linearized methods, etc.))
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71.20.Mq
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(Elemental semiconductors)
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61.46.+w
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