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(a) The top-view SEM image of the NPSi. (b) The optical microscopy image of the surface of LED grown on NPSi.
Bright-field images of LEDs grown on MPSi (a) and NPSi (b), (c) Multibeam dark-field images collected near zone axis. (d) Two-beam dark-field images collected using . Note that (c) and (d) are collected at the same region.
Raman spectra of LEDs grown on NPSi and MPSi under back scattering geometry.
(a) The I-V characteristics. (b) The L-I curves. The inset is the comparison of EL spectra at 20 mA injection current.
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