Self-assembly of alkanethiols to protect GaAs(100)

Pablo Mancheno-Posso, Anthony J Muscat

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

A comparative study of the chemical passivation of GaAs(100) using alkanethiols (R-SH, R=CnH2n+1) with different carbon chain lengths (n=3-18) was performed using spectroscopic ellipsometry, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and water contact angle. The time required to reoxidize the surface when exposed to the ambient scaled with the length of the chain. A threshold of about 12 C atoms was necessary for minimal protection. 1-octadecanethiol (OT-18C) containing 18 C atoms prevented reoxidation for 3 min. The OT-18C self-assembled into a monolayer containing closely packed molecules at a tilt angle from the surface normal of about 28°. The crystalline structure presented a physical barrier to oxygen diffusion with a thickness of 2.2 nm. Alkanethiols could offer ease of deposition and removal with protective properties to enable the use of III-V materials in high volume manufacturing.

Original languageEnglish (US)
Title of host publicationECS Transactions
PublisherElectrochemical Society Inc.
Pages289-296
Number of pages8
Volume58
Edition6
DOIs
StatePublished - 2013

Fingerprint

Self assembly
Atoms
Spectroscopic ellipsometry
Chain length
Passivation
Contact angle
Fourier transform infrared spectroscopy
Monolayers
X ray photoelectron spectroscopy
Crystalline materials
Molecules
Carbon
Oxygen
Water

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Mancheno-Posso, P., & Muscat, A. J. (2013). Self-assembly of alkanethiols to protect GaAs(100). In ECS Transactions (6 ed., Vol. 58, pp. 289-296). Electrochemical Society Inc.. https://doi.org/10.1149/05806.0289ecst

Self-assembly of alkanethiols to protect GaAs(100). / Mancheno-Posso, Pablo; Muscat, Anthony J.

ECS Transactions. Vol. 58 6. ed. Electrochemical Society Inc., 2013. p. 289-296.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Mancheno-Posso, P & Muscat, AJ 2013, Self-assembly of alkanethiols to protect GaAs(100). in ECS Transactions. 6 edn, vol. 58, Electrochemical Society Inc., pp. 289-296. https://doi.org/10.1149/05806.0289ecst
Mancheno-Posso P, Muscat AJ. Self-assembly of alkanethiols to protect GaAs(100). In ECS Transactions. 6 ed. Vol. 58. Electrochemical Society Inc. 2013. p. 289-296 https://doi.org/10.1149/05806.0289ecst
Mancheno-Posso, Pablo ; Muscat, Anthony J. / Self-assembly of alkanethiols to protect GaAs(100). ECS Transactions. Vol. 58 6. ed. Electrochemical Society Inc., 2013. pp. 289-296
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