Conductive Molecular Silicon

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• 作者：Rebekka S. Klausen ; Jonathan R. Widawsky ; Michael L. Steigerwald ; Latha Venkataraman ; Colin Nuckolls
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：March 14, 2012
• 年：2012
• 卷：134
• 期：10
• 页码：4541-4544
• 全文大小：258K
• 年卷期：v.134,no.10(March 14, 2012)
• ISSN：1520-5126

文摘

Bulk silicon, the bedrock of information technology, consists of the deceptively simple electronic structure of just Si鈥揝i 蟽 bonds. Diamond has the same lattice structure as silicon, yet the two materials have dramatically different electronic properties. Here we report the specific synthesis and electrical characterization of a class of molecules, oligosilanes, that contain strongly interacting Si鈥揝i 蟽 bonds, the essential components of the bulk semiconductor. We used the scanning tunneling microscope-based break-junction technique to compare the single-molecule conductance of these oligosilanes to those of alkanes. We found that the molecular conductance decreases exponentially with increasing chain length with a decay constant 尾 = 0.27 卤 0.01 脜^鈥?, comparable to that of a conjugated chain of C鈺怌 蟺 bonds. This result demonstrates the profound implications of 蟽 conjugation for the conductivity of silicon.