Electrical and electrochemical properties of alkyl-monolayer Modified Si(111) in the presence of water

Tetsuya Osaka, Mariko Matsunaga, So Kudo, Daisuke Niwa, Yosi Shacham-Diamand, Wolfram Jaegermann, Ralf Hunger

Research output: Contribution to journalArticle

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Abstract

Fundamental electronic properties of methyl-modified n-Si(111) interfaces created by the displacement of Cl on Si(111) surface by the methyl group from Grignard reagents (RMgX; X=Br or Cl, R = methyl) were measured in the presence and absence of water. The presence of water played a significant role in determining the behavior of the devices. The structure of Ga-In /methyl monolayer/ n-Si(111) was not rectifying but only consisted of series resistances. On the other hand, a diode-like rectifying property was observed with the water/methyl layers/ n-Si(111) heterojunction structure. Functionalization of Si(111) surfaces with various alkyl moieties such as methyl, ethyl, propyl, butyl, and mixed methyl/propyl, was studied by electrochemical measurements performed in a mixture of 3 mM K3 Fe(CN) 6 3 mM K4 Fe(CN) 6 1 MKCl H2 O and by surface characterization with synchrotron radiation X-ray photoelectron spectroscopy. The transistor characteristics of field effect transistor-like devices with water/alkyl/ n-Si(111) gate structures were investigated. The device properties clearly depended on the alkyl moiety: transistor-like behavior was observed only for devices with methyl moiety, and for those with a mixed methyl-propyl monolayer prepared by using Grignard reagents with mixed methyl and propyl (CH3 MgBr: CH3 CH2 CH2 MgBr=1:9) moieties, whereas no transistor-like behavior was observed for devices with butyl or ethyl moiety.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume154
Issue number11
DOIs
Publication statusPublished - 2007

Fingerprint

Electrochemical properties
Monolayers
Electric properties
electrical properties
Transistors
Water
transistors
water
reagents
Field effect transistors
Synchrotron radiation
Electronic properties
Heterojunctions
Diodes
X ray photoelectron spectroscopy
heterojunctions
synchrotron radiation
field effect transistors
diodes
photoelectron spectroscopy

ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Electrical and electrochemical properties of alkyl-monolayer Modified Si(111) in the presence of water. / Osaka, Tetsuya; Matsunaga, Mariko; Kudo, So; Niwa, Daisuke; Shacham-Diamand, Yosi; Jaegermann, Wolfram; Hunger, Ralf.

In: Journal of the Electrochemical Society, Vol. 154, No. 11, 2007.

Research output: Contribution to journalArticle

Osaka, Tetsuya ; Matsunaga, Mariko ; Kudo, So ; Niwa, Daisuke ; Shacham-Diamand, Yosi ; Jaegermann, Wolfram ; Hunger, Ralf. / Electrical and electrochemical properties of alkyl-monolayer Modified Si(111) in the presence of water. In: Journal of the Electrochemical Society. 2007 ; Vol. 154, No. 11.
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