Piezospectroscopy of isolated lithium donors and lithium-oxygen donor complexes in silicon
- 1 May 1981
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 23 (9) , 4426-4440
- https://doi.org/10.1103/physrevb.23.4426
Abstract
The effect of uniaxial stress on the excitation spectra of interstitial lithium donors (Li) and of lithium-oxygen donor complexes (Li-O) in silicon is studied under a high resolution. For a compressive force, , along [001], each transition in Si(Li) splits into three components, the central component occurring at the zero-stress position even at 2 kbar, the highest stress used. The intensity of the high-energy component decreases dramatically while that of the low-energy component increases. At the highest stress only the central and the low-energy components survive and the position of the low-energy component reaches a constant value as the stress increases. Interstitial lithium donors have an anomalous, "inverted" ground state with the fivefold state close to the effective-mass position, its site symmetry being ; the totally symmetric state lies meV above it. The inverted ground state, the small value of , the stress dependence of the ground-state wave functions, and a shear-deformation-potential constant of 8.77 ± 0.07 eV characterizing both the ground and the excited states account for its striking piezospectroscopic behavior. Our studies in Li-O donor centers show that they have a group-V-like ground state with lying below and . One of the donor species has a symmetry lower than with a symmetry axis along , showing the effects of orientational degeneracy in its piezospectroscopic behavior.
Keywords
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