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Englishhotoreflectance (PR) and optical absorption (OA) have been used to study the energy-gap dependence on temperature in In1-xGaxAs thin layers, metalorganic vapor-phase epitaxy grown on InP substrates under nearly lattice-matched conditions (‖Δa/a0‖≤10-3). Both PR and OA spectra show a split structure in the band-gap energy region. Moreover, the energy-gap values at all temperatures, obtained by Franz-Keldysh-oscillations analysis of PR line shapes, are blueshifted with respect to the values of the perfectly lattice-matched alloy (x=0.472). The results are related to the valence-band splitting at k=0 generated by the biaxial strain in In1-xGaxAs, due to the small lattice mismatch. We calculated the splitting and shift values using the orbital-strain Hamiltonian and accounting for compositional effects. The values are in agreement with the experimental results giving optical evidence of coherent growth of the alloy film.
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| Titolo: | Optical study of the strain effect in pseudomorphic In1-xGaxAs-InP heterostructures |
| Autori: | |
| Data di pubblicazione: | 1994 |
| Rivista: | |
| Abstract: | hotoreflectance (PR) and optical absorption (OA) have been used to study the energy-gap dependence on temperature in In1-xGaxAs thin layers, metalorganic vapor-phase epitaxy grown on InP substrates under nearly lattice-matched conditions (‖Δa/a0‖≤10-3). Both PR and OA spectra show a split structure in the band-gap energy region. Moreover, the energy-gap values at all temperatures, obtained by Franz-Keldysh-oscillations analysis of PR line shapes, are blueshifted with respect to the values of the perfectly lattice-matched alloy (x=0.472). The results are related to the valence-band splitting at k=0 generated by the biaxial strain in In1-xGaxAs, due to the small lattice mismatch. We calculated the splitting and shift values using the orbital-strain Hamiltonian and accounting for compositional effects. The values are in agreement with the experimental results giving optical evidence of coherent growth of the alloy film. |
| Handle: | http://hdl.handle.net/11571/100620 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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