InGaP grown on Ge (100) by molecular beam epitaxy: a spectroscopic ellipsometry study
| Autor: | Wan Khai Loke, Qian Zhou, Soon Fatt Yoon, Vijay Richard D'Costa, Yee-Chia Yeo |
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| Přispěvatelé: | School of Electrical and Electronic Engineering |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Phonon Analytical chemistry 02 engineering and technology medicine.disease_cause 01 natural sciences Molecular physics Critical point (mathematics) Condensed Matter::Materials Science 0103 physical sciences Materials Chemistry medicine Dielectric function Electrical and Electronic Engineering 010302 applied physics Semiconductor Science and Technology Derivative analysis 021001 nanoscience & nanotechnology Condensed Matter Physics Electronic Optical and Magnetic Materials Molecular vibration Spectroscopic ellipsometry 0210 nano-technology Ultraviolet Molecular beam epitaxy |
| Zdroj: | Semiconductor Science and Technology. 31:035022 |
| ISSN: | 1361-6641 0268-1242 |
| DOI: | 10.1088/0268-1242/31/3/035022 |
| Popis: | We investigated the optical properties of disordered In0.52Ga0.48P alloys by spectroscopic ellipsometry in the far-infrared to ultraviolet energy range (0.037–5.1 eV). The alloys were grown on Ge (100) substrate by solid-source molecular beam epitaxy. The far-infrared dielectric function reveals two absorption peaks that can be attributed to InP- and GaP-like vibrational modes. The visible-UV dielectric function of In0.52Ga0.48P alloys nearly lattice-matched to Ge shows the critical points E 0, E 1, and E 2, energies of which are determined using a derivative analysis. A weak transition that can be identified as the E 1 + Δ1 critical point is revealed. The vibrational frequencies and the transition energies in In0.52Ga0.48P are lower relative to In0.49Ga0.51P lattice-matched to GaAs. The downward shifts in E 0 and phonons can be estimated using the compositional dependence of E 0 and phonons of bulk alloys. NRF (Natl Research Foundation, S’pore) Accepted version |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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