Schematic diagram depicting the sample structure and its band diagram showing the electron wave function penetrating to vacuum.
Photoreflectance spectra of the reference and the sulfur treated NSQW samples as a function of the sulfur treatment time.
e1-lh1 transition energy showing the blueshift with increase in the passivation treatment duration.
Ga 2p core level spectra of the reference and Na2S-treated NSQW samples. Inset: Valence band spectra of the corresponding samples showing the band bending.
XPS spectra showing the Al 2p core levels of the as-grown NSQW and the same after 30 min of sulfur-treatment.
Variation of the transition energies with the barrier thickness.
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