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Characterizing the metal-SAM interface in tunneling junctions

ACS Nano, ISSN: 1936-086X, Vol: 9, Issue: 2, Page: 1471-1477
2015
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Article Description

This paper investigates the influence of the interface between a gold or silver metal electrode and an n-alkyl SAM (supported on that electrode) on the rate of charge transport across junctions with structure Met(Au or Ag)/A(CH)H//GaO/EGaIn by comparing measurements of current density, J(V), for Met/AR = Au/thiolate (Au/SR), Ag/thiolate (Ag/SR), Ag/carboxylate (Ag/OCR), and Au/acetylene (Au/C≡CR), where R is an n-alkyl group. Values of Jand β (from the Simmons equation) were indistinguishable for these four interfaces. Since the anchoring groups, A, have large differences in their physical and electronic properties, the observation that they are indistinguishable in their influence on the injection current, J(V = 0.5) indicates that these four Met/A interfaces do not contribute to the shape of the tunneling barrier in a way that influences J(V).

Bibliographic Details

Bowers, Carleen M; Liao, Kung-Ching; Zaba, Tomasz; Rappoport, Dmitrij; Baghbanzadeh, Mostafa; Breiten, Benjamin; Krzykawska, Anna; Cyganik, Piotr; Whitesides, George M

American Chemical Society (ACS)

Materials Science; Engineering; Physics and Astronomy

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