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cross-sectional HREM image of well layer for sample 1(a), and for sample 2(b).
Room temperature PL spectra of samples 1 and 2.
Electron holograms of samples 1(a) and 2(c). The dark narrow band corresponds to the InGaN layer. (b) and (d) Reconstructed phase images of (a) and (c), respectively.
Averaged phase shift profiles across InGaN layers of samples 1(a) and 2(b).
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