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(a) NSOM topography image of V-shape pit and measurement spots. (b) Near-field PL spectra taken from each spot. The inset shows that near-band-edge emission intensity changes very little but the V-pit related broad peak increased rapidly toward the pit center.
The upper line show the AFM profile of V pit about width and depth. The lower line shows surface potential distribution.
Power dependence micro-PL results of peak position and intensity at .
Closed-square line shows the difference of the surface potential between the flat region and center of pit, indicating that the Fermi level is lower in the larger pit case. Simultaneously, the open-circle line also increased with identical trend.
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