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- W1999498554 abstract "In this work, we demonstrate that depth-resolved confocal micro-Raman spectroscopy can be used to characterize the active layer of GaN-based LEDs. By taking the depth compression effect due to refraction index mismatch into account, the axial profiles of Raman peak intensities from the GaN capping layer toward the sapphire substrate can correctly match the LED structural dimension and allow the identification of unique Raman feature originated from the 0.3 μm thick active layer of the studied LED. The strain variation in different sample depths can also be quantified by measuring the Raman shift of GaN A1(LO) and E2(high) phonon peaks. The capability of identifying the phonon structure of buried LED active layer and depth-resolving the strain distribution of LED structure makes this technique a potential optical and remote tool for in operando investigation of the electronic and structural properties of nitride-based LEDs." @default.
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- W1999498554 date "2013-11-01" @default.
- W1999498554 modified "2023-10-18" @default.
- W1999498554 title "Depth-resolved confocal micro-Raman spectroscopy for characterizing GaN-based light emitting diode structures" @default.
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- W1999498554 doi "https://doi.org/10.1063/1.4829627" @default.
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