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Nanoepitaxy of GaAs on a Si(001) substrate using a round-hole nanopatterned SiO_2 mask

机译:使用圆孔纳米图案化的SiO_2掩模在Si(001)衬底上GaAs的纳米表观

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GaAs is grown by metal-organic vapor-phase epitaxy on a 55 nm round-hole patterned Si substrate with SiO_2 as a mask. The threading dislocations, which are stacked on the lowest energy facet plane, move along the SiO_2 walls, reducing the number of dislocations. The etching pit density of GaAs on the 55 nm round-hole patterned Si substrate is about 3.3 × 10~5 cm~(-2). Compared with the full width at half maximum measurement from x-ray diffraction and photoluminescence spectra of GaAs on a planar Si(001) substrate, those of GaAs on the 55 nm round-hole patterned Si substrate are reduced by 39.6 and 31.4%, respectively. The improvement in material quality is verified by transmission electron microscopy, field-emission scanning electron microscopy, Hall measurements, Raman spectroscopy, photoluminescence, and x-ray diffraction studies.
机译:GaAs通过金属有机气相外延在以SiO_2为掩模的55 nm圆孔图案化Si衬底上生长。堆积在最低能量小平面上的螺纹位错沿着SiO_2壁移动,从而减少了位错的数量。在55nm圆孔构图的Si衬底上GaAs的刻蚀坑密度约为3.3×10〜5 cm〜(-2)。与通过平面Si(001)衬底上的GaAs的x射线衍射和光致发光光谱测得的半峰全宽相比,在55 nm圆孔构图的Si衬底上的GaAs的半峰宽分别降低了39.6%和31.4%。 。通过透射电子显微镜,场发射扫描电子显微镜,霍尔测量,拉曼光谱,光致发光和X射线衍射研究证明了材料质量的提高。

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