Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3429085
Keywords
conduction bands; energy gap; germanium; k; p calculations; photoluminescence; triboluminescence; valence bands
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Funding
- National Science Council of ROC [97-2221-E-002-229-MY3, 98-2120-M-002-007-]
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Strong enhancement of Ge direct transition by biaxial-tensile strain was observed. The reduction in band gap difference between the direct and indirect valleys by biaxial tensile strain increases the electron population in the direct valley, and enhances the direct transition. The band gap reduction in the direct and indirect valleys can be extracted from the photoluminescence spectra and is consistent with the calculations using k.p and deformation potential methods for conduction bands and valence bands, respectively. (C) 2010 American Institute of Physics. [doi:10.1063/1.3429085]
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