Electrostatic Mechanism of Emission Enhancement in Hybrid Metal-semiconductor Light-emitting Heterostructures Page: 57
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4.6 Summary and Future Work
In conclusion I have presented here a new technique for extracting strain
information from the spectra of optically active regions of a sample. Combining
experimental data with theoretical modeling, this general spectroscopic technique can
be coupled with near-field microscopy in order to image the strain in light-emitting
nanostructures. The simultaneous measurement of strain and optical emission
characteristics provided by our strain mapping technique allows for an in-depth analysis
of the system being studied.
Further work on this topic is needed to improve the calculations. Firstly, it is
important to go back and include all the optical phonon modes in the calculation, instead
of only considering the I-LO phonon modes. Secondly, it is imperative to include in the
exciton calculations the effects of the strain-dependent piezoelectric constant. Finally,
this technique needs to be expanded to include other geometries, including quantum
AIN III-V (Nitride) -200
* III-V (Other)
S4 - \ MSe
0.30 0.35 0.55 0.60 O.65
Lattice Constant (un)
Figure 4.8 Emission energy of common semiconductors versus their
lattice constants. The regions circled by the black dashed lines
represent semiconductors known to exhibit phonon replicas.
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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/m1/67/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .