Self-assembled monolayers of alkyl-thiols on InAs: A Kelvin probe force microscopy study
Authors:
- Anna Teresa Szwajca,
- J. Wei,
- M.I. Schukfeh,
- M. Tornow
Abstract
We report on the preparation and characterization of self-assembled monolayers from aliphatic thiols with different chain length and termination on InAs (100) planar surfaces. This included as first step the development and investigation of a thorough chemical InAs surface preparation step using a dedicated bromine/NH4OH-based etching process. Ellipsometry, contact angle measurements and atomic force microscopy (AFM) indicated the formation of smooth, surface conforming monolayers. The molecular tilt angles were obtained as 30 ± 10° with respect to the surface normal. Kelvin probe force microscopy (KPFM) measurements in hand with Parameterized Model number 5 (PM5) calculations of the involved molecular dipoles allowed for an estimation of themolecular packing densities on the surface.Weobtained values of up to n = 1014 cm-2 for the SAMs under study. These are close to what is predicted from a simple geometrical model that would calculate a maximum density of about n = 2.7 × 1014 cm-2. We take this as additional conformation of the substrate smoothness and quality of our InAs-SAM hybrid layer systems.
- Record ID
- UAM1ed57924ff6a4a6397210157ca635f47
- Author
- Journal series
- Surface Science, ISSN 0039-6028
- Issue year
- 2015
- Vol
- 633
- Pages
- 53-59
- ASJC Classification
- ; ; ;
- DOI
- DOI:10.1016/j.susc.2014.11.023 Opening in a new tab
- Language
- (en) English
- Score (nominal)
- 25
- Score source
- journalList
- Score
- Publication indicators
- = 22; = 21; : 2015 = 0.873; : 2015 (2 years) = 1.931 - 2015 (5 years) =1.745
- Uniform Resource Identifier
- https://researchportal.amu.edu.pl/info/article/UAM1ed57924ff6a4a6397210157ca635f47/
- URN
urn:amu-prod:UAM1ed57924ff6a4a6397210157ca635f47
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or PerishOpening in a new tab system.