Electrostatic Mechanism of Emission Enhancement in Hybrid Metal-semiconductor Light-emitting Heterostructures Page: 70
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powers densities exceeding 3 mW cm-2 when the Debye radius becomes smaller than
the typical size of the nanospheres. Figure 5.6 shows the Debye radius as a function of
elapsed time and excitation power density for the reference sample. We note that our
calculations for the Debye radius presented here underestimate the actual value of rD
due to the assumption that the rate of conversion of incident photons to carriers in the
QWs is unity.
It is also clear that the Debye radius decreases with decreasing temperature.
This dependence explains the lower overall gain in IQE and PL enhancement for the Au
NP sample as compared to the reference sample at lower temperatures in the CW PL
experiment. This decrease in the radius reduces the area of increased concentration
surrounding the NP, and hence lowers the effective carrier concentration. The Debye
radius, however, decreases as T1/2, while the strength of the image charge effect
- + 4 I- 4 /
0 2 4 6 8 10 12' ,,"
Power Density (W/cm2) 0 1
0 2 4 6 8 10 12
Figure 5.7 PL Intensity as a function of incident
power density for the Au (red circles) and PwerDensity(W/cm
reference (black squares) systems. The Figure 5.6 Debye radius (nm) as a
dashed red line represents the effective carrier function of time and excitation power
concentration of the Au system in units of the density for the reference system.
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Llopis, Antonio. Electrostatic Mechanism of Emission Enhancement in Hybrid Metal-semiconductor Light-emitting Heterostructures, dissertation, May 2012; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc115113/m1/80/: accessed April 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .