Visualizing the Mechanism Switching in High-Temperature Au-Catalyzed InAs Nanowire Growth

被引:4
|
作者
Escobar Steinvall, Simon [2 ,3 ]
Johansson, Jonas [1 ,3 ]
Lehmann, Sebastian [1 ,3 ]
Tornberg, Marcus [2 ,3 ]
Jacobsson, Daniel [3 ,4 ]
Dick, Kimberly A. [2 ,3 ]
机构
[1] Lund Univ, Div Solid State Phys, S-22100 Lund, Sweden
[2] Lund Univ, Ctr Anal & Synth, S-22100 Lund, Sweden
[3] Lund Univ, NanoLund, S-22100 Lund, Sweden
[4] Lund Univ, Natl Ctr High Resolut Elect Microscopy, S-22100 Lund, Sweden
关键词
LIQUID-SOLID MECHANISM; INTERFACE DYNAMICS; ZINC BLENDE; GAAS; WURTZITE;
D O I
10.1021/acs.cgd.3c00138
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We use environmentaltransmission electron microscopyto observe in situ the switch from an axial vapor-liquid-solid(VLS) growth mechanism in Au-catalyzed InAs nanowires toward a radialvapor-solid (VS) one, dominated by layers nucleating at thetriple-phase line. At elevated temperatures, in addition to high V/IIIratios, the affinity for In in the Au catalyst will be greater thanthat of In in InAs, which in turn reduces the driving force and probabilityfor nucleation at the liquid-solid interface. Consequently,with increased temperature, the catalyst particle stops acting asa sink for incoming material and the decomposition of precursors awayfrom the catalyst increases, making radial vapor-solid growththe dominating growth mechanism. It is further observed that the growthproceeds through multistep propagation rather than a layer-by-layerpropagation under these conditions. Using in situ transmission electron microscopywe directly observe the switching from axial to radial growth in Au-catalyzedInAs nanowires and elucidate the mechanisms at play to limit vapor-liquid-solidgrowth.
引用
收藏
页码:6228 / 6232
页数:5
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