Averboukh, B. and Huber, Rupert and Cheah, K. W. and Shen, Y. R. and Qin, G.G. and Ma, Z. C. and Zong , W. H. (2002) Luminescence studies of a Si/SiO₂ superlattice. Journal of Applied Physics 92 (7), pp. 3564-3568.
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Photoluminescence and electroluminescence from a Si/SiO2 superlattice have been measured. They show similar characteristics and exhibit an inhomogeneously broadened photoluminescence band peaked at 2.06 eV. The excitation spectrum indicates that excitations occur in the Si layers. The insensitivity of the luminescence spectrum and decay to temperature and excitation wavelength suggests that luminescence originates from transitions between localized defect states. These localized states are most likely defect states residing at the Si/SiO2 interfaces, because there should be a significant concentration of defects at the interface and SiO2 due to the large lattice mismatch and the amorphous state. The close proximity of these states offers a more rapid transition path for the excited electrons. An energy band diagram of the superlattice is constructed based on our results.
|Institutions:||Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber|
|Subjects:||500 Science > 530 Physics|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||01 Feb 2011 11:15|
|Last Modified:||21 Jul 2011 02:06|