Mono-Fluorinated Alkyne-Derived SAMs on Oxide-Free Si(111) Surfaces: Preparation, Characterization and Tuning of the Si Workfunction

TY - JOUR

T1 - Mono-Fluorinated Alkyne-Derived SAMs on Oxide-Free Si(111) Surfaces

T2 - Preparation, Characterization and Tuning of the Si Workfunction

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

Y1 - 2013

N2 - Organic monolayers derived from ω-fluoro-1-alkynes of varying carbon chain lengths (C(10)-C(18)) 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.

AB - Organic monolayers derived from ω-fluoro-1-alkynes of varying carbon chain lengths (C(10)-C(18)) 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.

KW - Journal Article

U2 - 10.1021/la303403v

DO - 10.1021/la303403v

M3 - Journal article

C2 - 23286894

SN - 0743-7463

VL - 29

SP - 570

EP - 580

JO - Langmuir

JF - Langmuir

IS - 2

ER -