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(Color online) (a) Plane view SEM image of wet-etched PSS. (b) Schematic drawing of epitaxial layers and device structure with aligned micropits grown on PSS. (c) Optical microscope photograph of aligned micropit LED operated at low injection current .
(Color online) (a) TEM image of LED structure exhibiting MQWs on the top (0001) plane as well as that on the sidewalls of the micropits. (b) Temperature-dependent PL spectra of LED structure with self-aligned micropits grown on PSS.
Top view images of (a) SEM and (b) CL measured at the same location as that of the aligned micropit LED structure. (c) Schematic depiction of hexagonal depression and related defects. (d) Cross-sectional TEM image of hexagonal depression region.
(a) Typical characteristic of three types of LEDs such as conventional, PSS, and PSS micropit. (b) Light output power as a function of driving current of conventional-, PSS-, and PSS-micropit LEDs, respectively.
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