Competition between surface energy and interphase energy in transition region and diameter-dependent orientation of silicon nanowires |
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Authors: | Yu-Hong Huang |
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Institution: | College of Physics and Information Technology, Shaanxi Normal University, Xi’an 710062, Shaanxi, PR China |
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Abstract: | A small sandwiched transition region between the Au catalysis droplet and silicon nanowires (SiNWs) is proposed to investigate the diameter-dependent orientation of SiNWs grown by the vapor-liquid-solid (VLS) mechanism. Atomic-scale calculation shows that for a given transition region width, there is always a critical diameter. Below the critical value, surface energy dominates and the 〈1 1 0〉 orientation is preferred, whereas at larger diameters, the interphase energy dominates and SiNWs grow along the 〈1 1 1〉 direction. The variability of the critical diameter is also included in our model by adjusting the transition region width. The theoretical results are in agreement with those from experiments. |
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Keywords: | Silicon nanowires Surface energy Interphase energy Orientation |
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