Hostname: page-component-78c5997874-v9fdk Total loading time: 0 Render date: 2024-11-07T22:59:19.112Z Has data issue: false hasContentIssue false
  • English
  • Français

Physical Characterization and Electrical Transport in End-Group Functionalized Self-Assembled Monolayers

Published online by Cambridge University Press:  10 February 2011

J. Collet ,
D. Vuillaume ,
M. Bonnier ,
O. Bouloussa ,
F. Rondelez ,
J. M. Gay ,
K. Kham  and
C. Chevrot
J. Collet
Affiliation:
EMN-CNRS, ISEN Dept. of Physics, BP 69, F-59652 Villeneuve d'Ascq, France. [email protected] .fr
D. Vuillaume
Affiliation:
EMN-CNRS, ISEN Dept. of Physics, BP 69, F-59652 Villeneuve d'Ascq, France. [email protected] .fr
M. Bonnier
Affiliation:
Institut Pierre et Marie Curie, CNRS, 11 Avenue P. et M. Curie, F-75 Paris, France.
O. Bouloussa
Affiliation:
Institut Pierre et Marie Curie, CNRS, 11 Avenue P. et M. Curie, F-75 Paris, France.
F. Rondelez
Affiliation:
Institut Pierre et Marie Curie, CNRS, 11 Avenue P. et M. Curie, F-75 Paris, France.
J. M. Gay
Affiliation:
CRMC2-CNRS, Campus de Luminy, Case 913, F-13988 Marseille, France.
K. Kham
Affiliation:
LRPME, Univ. Cergy-Pontoise, F-95031 Cergy-Pontoise, France.
C. Chevrot
Affiliation:
LRPME, Univ. Cergy-Pontoise, F-95031 Cergy-Pontoise, France.
Get access

Abstract

We have previously demonstrated that a self-assembled monolayer (SAM) of alkyltrichlorosilane molecules, covalently bonded to the native oxide of a silicon substrate, allows the fabrication of MIS (Metal-Insulator-Semiconductor) devices with excellent electrical properties [1]. Here we demonstrate that we can functionalize, with π-electron moieties, the end-groups of the molecules, once grafted to the substrate, without disturbing the low conductivity through the SAM (σ⊥), while strongly increasing the in-plane conductivity (σ//). The functionalization of the monolayer is monitored by FTIR, ellipsometry and X ray reflectivity. Conductivity, photoconductivity and capacitance measurements are carried out to study the effect of these chemical functionalizations on the electrical properties of the monolayers. We demonstrate that the low perpendicular conductivity (σ⊥≈10−15 S/cm) is not altered by the end-group functionalities while high anisotropic conductivities (σ///σ⊥ ≈ 107-108) are obtained at a monolayer level. Interfacial (Si/SAM and SAM/metal) energy barriers are investigated as a function of the end-group functionalities. We also show that conducting monomers substituted by alkyl chains (3,6- dibromocarbazole-N-octyltrimethoxysilane), directly grafted to the substrate, exhibit similar behavior.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 488: Symposium J – Electrical, Optical & Magnetic Properties of Organic IV , 1997 , 847
Copyright
Copyright © Materials Research Society 1998

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Boulas, C., Davidovits, J., Rondelez, F., Vuillaume, D., Phys. Rev. Lett. 76, 4797 (1996)Google Scholar
2. Vuillaume, D. et al., Appl. Phys. Lett. 69, 1646 (1996)Google Scholar
3. Brzoska, J.B., Shahidzadeh, N. and Rondelez, F., Nature 360, 719 (1992)Google Scholar
4. Wasserman, S.R., Tao, Y.T., Whitesides, G.M., Langmuir 5, 1074 (1989)Google Scholar
5. Porter, M.D., Bright, T.B., Allara, D.L., Chidsey, C.E.D., J. Am. Chem. Soc. 109, 3559 (1987)Google Scholar
6. Tidswell, I.M, Ocko, B.M., Pershan, P.S., Wasserman, S.R., Whithesides, G.M., Axe, J.D., Phys. Rev. B 41, 1111 (1990)Google Scholar
7. Powell, R.J., J. Appl. Phys. 41, 2424 (1970)Google Scholar
8. Roberts, G.G., Ginnity, T.M., Barlow, W.A., Vincett, P.S., Thin Solid Films 68, 223 (1980)Google Scholar
9. Zhou, C., Newns, D.M., Misewich, J.A., Pattnaik, P.C., Appl. Phys. Lett. 70, 598 (1997)Google Scholar