Effect of precursor flux on compositional evolution in InP_{1?span style='font-style: italic'>x}Sb_x nanowires grown via self-catalyzed vapor¨Cliquid¨Csolid process

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• 作者：Chilan&#xA0 ; Ngo^a ; Hailong&#xA0 ; Zhou^b ; Matthew&#xA0 ; Mecklenburg^c ; Marta&#xA0 ; Pozuelo^a ; B.C.&#xA0 ; Regan^c ; Q.F.&#xA0 ; Xiao^b ; V.B.&#xA0 ; Shenoy^d ; R.F.&#xA0 ; Hicks^a ; &#xA0 ; ^b ; S.&#xA0 ; Kodambaka^a ; &#xA0 ; ^{kodambaka@ucla.edu}
• 关键词：A3. Self-catalyst ; B1. Nanostructures ; B1. Ternary alloy ; B2. InPSb
• 刊名：Journal of Crystal Growth
• 出版年：2011
• 出版时间：1 December 2011
• 年：2011
• 卷：336
• 期：1
• 页码：14-19
• 全文大小：1151 K

文摘

We investigated the effect of high flow rates (> 10^? mol/min) of metalorganic precursors on compositional evolution in indium phosphide antimonide (InP_1?i>xSb_x) nanowires grown via chemical vapor deposition in the presence of indium droplets as catalysts on InP(111)B substrates maintained at ?60 ¡ãC. The as-grown nanowire morphology, composition, and crystallinity are determined using scanning and transmission electron microscopies, selected-area electron diffraction, and x-ray energy dispersive spectroscopy. For all of the precursor flow rates, we obtain zinc blende structured InP_1-xSb_x wires that are tapered with wider tops, narrower bases, and In-rich In¨CSb alloy tips¡ªcharacteristic of the vapor¨Cliquid¨Csolid process. The Sb content within the InP_1?i>xSb_x wires is found to increase non-linearly with increasing Sb precursor flow rate. At the interfaces between the In¨CSb alloy tips and the InP_1-xSb_x nanowires, we observe single-crystalline wurtzite-structured InSb segments whose volumes depend on the Sb precursor flow rate. We attribute this phenomenon to the rapid crystallization of InSb during cooling of the Sb-rich In¨CSb alloy droplets.