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Multiple radial phosphorus segregations in GaAsP core-shell nanowires

Nano Research 2021年第1期14卷 157-164页

作者： H.Aruni Fonseka Yunyan Zhang james a.gott Richard Beanland Huiyun Liu Ana M.Sanchez Department of Physics University of WarwickCoventry CV47ALUK Department of Electronic and Electrical Engineering University College LondonLondon WC1E 7JEUK

Highly faceted geometries such as nanowires are prone toform self-formed features,especially those that are driven by *** these features is important in preventing their formation,understanding their effects on nanowire properties,or engineering them for *** elemental segregation lines that run along the radii of the hexagonal cross-section have been a common observation in alloy semiconductor ***,in GaAsP nanowires,two additional P rich bands are formed on either side of the primary band,resulting in a total of three segregation bands in the vicinity of three of the alternating *** bands are less intense than the primary band and their formation can be attributed to the inclined nanofacets that form in the vicinity of the *** formation of the secondary bands requires a higher composition of P in the shell,and to be grown under conditions that increase the diffusivity difference between As and ***,it is observed that the primary band can split into two narrow and parallel *** can take place in all six radii,making the cross sections to have up to a maximum of 18 radial segregation *** controlled growth,these features could be exploited to assemble multiple different quantum structures in a new dimension(circumferential direction)within nanowires.

关键词： compound semiconductor alloys radial segregations three-fold symmetry surface chemical potential

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