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MOS Capacitor

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...

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Updated: Oct 26, 2025

Soft Lithographic Functionalization and Patterning Oxide-free Silicon and Germanium

Soft Lithographic Functionalization and Patterning Oxide-free Silicon and Germanium

Published on: December 16, 2011

Impermeable Graphene Oxide Protects Silicon from Oxidation.

Soraya Rahpeima^1,2, Essam M Dief¹, Simone Ciampi¹

¹School of Molecular and Life Sciences, Curtin Institute of Functional Molecules and Interfaces, Curtin University, Bentley, Perth, Western Australia 6102, Australia.

ACS Applied Materials & Interfaces

|August 3, 2021

Summary

Graphene oxide (GO) layers protect silicon surfaces from oxidation for over 30 days, enabling stable hybrid electronics. This 2D material offers a functional alternative to traditional passivation methods, advancing semiconductor and organic electronics.

Keywords:

graphene oxide impermeable barriers oxidation protection of Si−H surfaces reduced graphene oxide self-assembled monolayers

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Area of Science:

Materials Science
Surface Chemistry
Nanotechnology

Background:

A natural silicon oxide (SiO2) layer on silicon (Si) hinders hybrid semiconductor and organic electronics by blocking charge transfer.
Existing methods like fluoride etching create reactive Si-H surfaces that reoxidize quickly under ambient conditions.

Purpose of the Study:

To investigate graphene oxide (GO) as a protective layer for silicon surfaces against oxidation.
To explore the potential of GO-functionalized silicon for advanced electronic applications.

Main Methods:

Application of a thin graphene oxide (GO) layer onto silicon surfaces.
Assessment of the GO layer's protective capabilities against oxidation under ambient conditions.
Electrochemical switching of GO to reduced graphene oxide (rGO).

Main Results:

The GO layer effectively prevented silicon surface oxidation for over 30 days.
The GO layer allowed for molecular modification, creating a functional surface for chemical conjugation and electrode connection.
Electrochemical switching to rGO demonstrated the dynamic nature of the GO layer.

Conclusions:

Graphene oxide serves as a robust passivation layer for silicon, overcoming limitations of traditional methods.
GO-functionalized silicon surfaces enable new possibilities for hybrid Si and 2D materials technologies.
This approach offers a viable alternative to organic self-assembled monolayers for protecting and tuning silicon properties.