Midinfrared spectroscopic ellipsometry reveals the two-phonon mode behavior of GaNyP1-y for nitrogen compositions 0.006≤y≤0.0285. The single layers (∼350 nm) studied were grown by metalorganic vapor-phase epitaxy on GaP substrates with orientations (001), and (001) with 5° off toward . Line-shape analysis of the midinfrared response allows determination of the transverse-and longitudinal-optical phonon frequencies of the GaP-and GaN-like phonon modes. The polar strength of the GaN lattice resonance increases linearly with y, which can be used to monitor the nitrogen content of GaNyP1-y.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)