Articles you may be interested inHigh-quality strain-relaxed SiGe films grown with low temperature Si buffer Optimization of luminescent properties with respect to crystal growth temperatures for SiGe single quantum wells grown by molecular beam epitaxy
We present investigations of band-gap variations on selective grown GaxIn1−xAsyP1−y multiple quantum wells (MQW, Q1.05) using near-field optical microscopy. The MQW is excited with the near-field probe and the luminescence is collected through the same tip. By this mode, we are able to detect variation of the band gap with a lateral resolution of about 550 nm at a luminescence wavelength of 1115 nm. We show a spatial band-gap modulation near the (0–11) facet of the selective grown structures, which we suggest, is a result of a variation of the material composition. Furthermore, together with the simultaneously recorded topography, we are able to allocate a recombination path at a center wavelength of λ=1115 nm to the intersection of the (01–1) and (11–1) vertical side facets, which are formed by interfacet diffusion during surface selective growth of the GaxIn1−xAsyP1−y MQW.
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