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(Color online) (a) Schematic diagram of the experimental setup for preparing -NPS layers. (b) The illustrative mechanism of conventional method for -PS formation (left side figure) and the illustrative mechanism of -PS formation with the assistance of bottom--layer holes based on a structure (right side figure).
Top views and cross section views of SEM images on -NPS samples: (a) and (b) , (c) and (d) , (e) and (f) , and (g) and (h) the magnification of (e) and (f).
(Color online) characteristic of cases A–C, which are measured by Keithley 236 source-measure unit.
(Color online) (a) PL spectra of cases A–C (excitation wavelength of 325 nm He-Cd laser), and (b) the naked-eye photos of the samples under normal light and UV light at room temperature.
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