Structural and optical properties of MBE grown GaNAs/GaAs quantum well structures
2001
Abstract Structural and optical properties of GaNAs/GaAs quantum well (QW) structures are studied by performing X-ray diffraction (XRD) and photoluminescence (PL) measurements. Arsenic-rich GaNAs layers were grown by molecular beam epitaxy with a water-cooled nitrogen plasma cell. The nitrogen content x of our GaN x As 1− x layers were in the range of 0.5–2%. Clear PL signals with a tail in the low energy side were observed from GaN x As 1− x /GaAs QWs. The positions of these PL peaks are roughly explained by theory using a reported bowing parameter. Electrical properties of a selectively doped GaAs/GaN x As 1− x /n-AlGaAs structure were also studied. It is found that electrons are accumulated in the GaNAs layer . The fluctuation of alloy compositions appears to have a dominant effect on electron mobilities.
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