Abstract
The sharp resonances in reflectance difference spectroscopy (RDS) data at the critical points of the dielectric function of bulk semiconductors have been assigned to surface-bulk transitions, photon localization, or optical transitions from bound dimer states to excited dimer states. For the case of ZnTe, CdTe, and ZnSe, we present experimental data indicating that a uniaxial in-plane stress component induces sharp resonances at these critical points by lifting the degeneracy of the optical transitions at the Λ and Γ points due to the resulting anisotropic strain. Even small stresses of about 1–5 MPa, or strains on the order of 1×10−5 can be detected with RDS.
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More From: Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena
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