Nickel/Platinum Dual Silicide Axial Nanowire Heterostructures with Excellent Photosensor Applications

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• 作者：Yen-Ting Wu ; Chun-Wei Huang ; Chung-Hua Chiu ; Chia-Fu Chang ; Jui-Yuan Chen ; Ting-Yi Lin ; Yu-Ting Huang ; Kuo-Chang Lu ; Ping-Hung Yeh ; Wen-Wei Wu
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：February 10, 2016
• 年：2016
• 卷：16
• 期：2
• 页码：1086-1091
• 全文大小：464K
• ISSN：1530-6992

文摘

Transition metal silicide nanowires (NWs) have attracted increasing attention as they possess advantages of both silicon NWs and transition metals. Over the past years, there have been reported with efforts on one silicide in a single silicon NW. However, the research on multicomponent silicides in a single silicon NW is still rare, leading to limited functionalities. In this work, we successfully fabricated β-Pt₂Si/Si/θ-Ni₂Si, β-Pt₂Si/θ-Ni₂Si, and Pt, Ni, and Si ternary phase axial NW heterostructures through solid state reactions at 650 °C. Using in situ transmission electron microscope (in situ TEM), the growth mechanism of silicide NW heterostructures and the diffusion behaviors of transition metals were systematically studied. Spherical aberration corrected scanning transmission electron microscope (Cs-corrected STEM) equipped with energy dispersive spectroscopy (EDS) was used to analyze the phase structure and composition of silicide NW heterostructures. Moreover, electrical and photon sensing properties for the silicide nanowire heterostructures demonstrated promising applications in nano-optoeletronic devices. We found that Ni, Pt, and Si ternary phase nanowire heterostructures have an excellent infrared light sensing property which is absent in bulk Ni₂Si or Pt₂Si. The above results would benefit the further understanding of heterostructured nano materials.