Nano Archive

Single crystalline PtSi nanowires, PtSi/Si/PtSi nanowire heterostructures, and nanodevices

Lin, Yung-Chen and Lu, Kuo-Chang and Wu, Wen-Wei and Bai, Jingwei and Chen, Lih J. and Tu, K. N. and Huang, Yu (2008) Single crystalline PtSi nanowires, PtSi/Si/PtSi nanowire heterostructures, and nanodevices. NANO LETTERS, 8 (3). pp. 913-918.

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We report the formation of PtSi nanowires, PtSi/Si/PtSi nanowire heterostructures, and nanodevices from such heterostructures. Scanning electron microscopy studies show that silicon nanowires can be converted into PtSi nanowires through controlled reactions between lithographically defined platinum pads and silicon nanowires. High-resolution transmission electron microscopy studies show that PtSi/Si/PtSi heteorstructure has an atomically sharp interface with epitaxial relationships of Si[1 (1) over bar0]//PtSi[010] and Si(111)//PtSi(101). Electrical measurements show that the pure PtSi nanowires have low resistivities similar to 28.6 mu and high breakdown current densities > 1 x 10(8) A/cm(2). Furthermore, using single crystal PtSi/Si/PtSi nanowire heterostructures with atomically sharp interfaces, we have fabricated high-performance nanoscale field-effect transistors from intrinsic silicon nanowires, in which the source and drain contacts are defined by the metallic PtSi nanowire regions, and the gate length is defined by the Si nanowire region. Electrical measurements show nearly perfect p-channel enhancement mode transistor behavior with a normalized transconductance of 0.3 mS/mu m, field-effect hole mibility of 168 cm(2)N.s, and on/off ratio > 10(7), demonstrating the best performing device from intrinsic silicon nanowires.

Item Type:Article
Subjects:Physical Science > Nanophysics
Material Science > Nanofabrication processes and tools
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
ID Code:2350
Deposited By:Anuj Seth
Deposited On:17 Dec 2008 17:21
Last Modified:20 Jan 2009 10:37

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