Mono-fluorinated alkyne-derived SAMs on oxide-free Si(111) surfaces: Preparation, characterization and tuning of the Si workfunction

Sidharam P. Pujari; Esther Van Andel; Omer Yaffe; David Cahen; Tobias Weidner; Cees J.M. Van Rijn; Han Zuilhof

doi:10.1021/la303403v

Mono-fluorinated alkyne-derived SAMs on oxide-free Si(111) surfaces: Preparation, characterization and tuning of the Si workfunction

Sidharam P. Pujari, Esther Van Andel, Omer Yaffe, David Cahen, Tobias Weidner, Cees J.M. Van Rijn, Han Zuilhof^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

36 Citations (Scopus)

Abstract

Organic monolayers derived from ω-fluoro-1-alkynes of varying carbon chain lengths (C₁₀-C₁₈) were prepared on Si(111) surfaces, resulting in changes of the physical and electronic properties of the surface. Analysis of the monolayers using XPS, Infrared Reflection Absorption Spectroscopy, ellipsometry and static water contact angle measurements provided information regarding the monolayer thickness, the tilt angle, and the surface coverage. Additionally, PCFF molecular mechanics studies were used to obtain information on the optimal packing density and the layer thickness, which were compared to the experimentally found data. From the results, it can be concluded that the monolayers derived from longer chain lengths are more ordered, possess a lower tilt angle, and have a higher surface coverage than monolayers derived from shorter chains. We also demonstrate that by substitution of an H by F atom in the terminal group, it is possible to controllably modify the surface potential and energy barrier for charge transport in a full metal/monolayer- semiconductor (MOMS) junction.

Original language	English
Pages (from-to)	570-580
Number of pages	11
Journal	Langmuir
Volume	29
Issue number	2
DOIs	https://doi.org/10.1021/la303403v
Publication status	Published - 15 Jan 2013

Funding

Marie Curie European Union FP7 project "Surface Physics for Advanced Materials" research program; ASML NetherlandsThe authors acknowledge financial support by the Marie Curie European Union FP7 project "Surface Physics for Advanced Materials" research program and by ASML Netherlands. They also thank Frank Claassen, Elbert van der Klift, Barend van Lagen, and Marcel Giesbers (all Wageningen University) and Luc Scheres (Surfix By) for instrumental assistance and insightful discussions. We thank a reviewer from a previous version of this manuscript for helpful comments on our wetting experiments. O.Y. and D.C. thank the ISF center of excellence.

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Spectroscopy
General Materials Science
Surfaces and Interfaces
Electrochemistry

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10.1021/la303403v

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title = "Mono-fluorinated alkyne-derived SAMs on oxide-free Si(111) surfaces: Preparation, characterization and tuning of the Si workfunction",

abstract = "Organic monolayers derived from ω-fluoro-1-alkynes of varying carbon chain lengths (C10-C18) were prepared on Si(111) surfaces, resulting in changes of the physical and electronic properties of the surface. Analysis of the monolayers using XPS, Infrared Reflection Absorption Spectroscopy, ellipsometry and static water contact angle measurements provided information regarding the monolayer thickness, the tilt angle, and the surface coverage. Additionally, PCFF molecular mechanics studies were used to obtain information on the optimal packing density and the layer thickness, which were compared to the experimentally found data. From the results, it can be concluded that the monolayers derived from longer chain lengths are more ordered, possess a lower tilt angle, and have a higher surface coverage than monolayers derived from shorter chains. We also demonstrate that by substitution of an H by F atom in the terminal group, it is possible to controllably modify the surface potential and energy barrier for charge transport in a full metal/monolayer- semiconductor (MOMS) junction.",

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AU - Pujari, Sidharam P.

AU - Van Andel, Esther

AU - Yaffe, Omer

AU - Cahen, David

AU - Weidner, Tobias

AU - Van Rijn, Cees J.M.

AU - Zuilhof, Han

PY - 2013/1/15

Y1 - 2013/1/15

N2 - Organic monolayers derived from ω-fluoro-1-alkynes of varying carbon chain lengths (C10-C18) were prepared on Si(111) surfaces, resulting in changes of the physical and electronic properties of the surface. Analysis of the monolayers using XPS, Infrared Reflection Absorption Spectroscopy, ellipsometry and static water contact angle measurements provided information regarding the monolayer thickness, the tilt angle, and the surface coverage. Additionally, PCFF molecular mechanics studies were used to obtain information on the optimal packing density and the layer thickness, which were compared to the experimentally found data. From the results, it can be concluded that the monolayers derived from longer chain lengths are more ordered, possess a lower tilt angle, and have a higher surface coverage than monolayers derived from shorter chains. We also demonstrate that by substitution of an H by F atom in the terminal group, it is possible to controllably modify the surface potential and energy barrier for charge transport in a full metal/monolayer- semiconductor (MOMS) junction.

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Mono-fluorinated alkyne-derived SAMs on oxide-free Si(111) surfaces: Preparation, characterization and tuning of the Si workfunction

Abstract

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All Science Journal Classification (ASJC) codes

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