A New Route to Nondestructive Top-Contacts for Molecular Electronics on Si: Pb Evaporated on Organic Monolayers
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- 作者：Robert Lovrin膷i膰 ; Olga Kraynis ; Rotem Har-Lavan ; Abd-Elrazek Haj-Yahya ; Wenjie Li ; Ayelet Vilan ; David Cahen
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2013
- 出版时间：February 7, 2013
- 年：2013
- 卷：4
- 期：3
- 页码：426-430
- 全文大小：342K
- 年卷期：v.4,no.3(February 7, 2013)
- ISSN：1948-7185
文摘
Thermally evaporated Pb preserves the electronic properties of an organic monolayer (ML) on Si and surface passivation of the Si surface itself. The obtained current鈥搗oltage characteristics of Pb/ML/Si junctions agree with results obtained with the well-established Hg contact and preserve both the molecule-induced dipole effect on, and length-attenuation of, the current. We rationalize our findings by the lack of interaction between the Pb and the Si substrate. This method is fast, scalable, and compatible with standard semiconductor processing, results in close to 100% yield, and can help the development of large-scale utilization of silicon-organic hybrid electronics. Our experimental data show a dependence of the transport across the molecules on the substrate orientation, expressed in the smaller distance decay parameter with Si(100) than that with Si(111).