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Photoadsorption and photodesorption for GaN
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View: Figures


Image of FIG. 1.
FIG. 1.

PL spectra of sample A in air and vacuum (HeCd laser, ). PL intensity at for sample B (not included) changed by only 20% in air vs vacuum. The insert shows decreasing PL intensity in air ambient under continuous exposure of sample A. PL intensity at for sample B did not change during UV illumination in air ambient.

Image of FIG. 2.
FIG. 2.

Evolution of PL intensity at for sample A before and after exposure to air at time . The laser was blocked between 5.5 and .

Image of FIG. 3.
FIG. 3.

Evolution of SPV in different gas environments for (a) sample A and (b) sample B . The UV illumination is turned on at and turned off later. Note that the SPV signal significantly decreases under illumination in air or oxygen for both samples.

Image of FIG. 4.
FIG. 4.

(a) Evolution of SPV for sample B in air for short (few seconds) and long exposures to light . The light is switched off at time . (b) Adsorption-related component of SPV derived from (a) assuming that SPV due to internal mechanism does not change during UV exposure and decays in dark as for short exposure. Part 1 is equal to the initial SPV offset value minus the “long” curve for ; part 2 is equal to the difference between the “short” and long curves for .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Photoadsorption and photodesorption for GaN