Band Alignment of Metal-Oxide-Semiconductor Structure by Internal Photoemission Spectroscopy and Spectroscopic Ellipsometry

Published

December 10, 2010

Author(s)

Nhan V. Nguyen, Oleg A. Kirillov, John S. Suehle

Abstract

In this paper, we will provide an overview of the internal photoemission (IPE) and the significance of this technique when combined with spectroscopic ellipsometry (SE) to investigate the interfacial electronic properties of heterostructures. In particular, the main interest is focused on the electron transport mechanism and properties at and near the interface of the technologically important metal-oxide-semiconductor (MOS) devices. Not until recently, IPE and SE have become important metrology tools in band offset characterization for the MOS materials. The most common and straightforward application of IPE and SE is to determine how the Fermi level of the metal, and the conduction and valence bands of the semiconductor align with those of the oxide of the MOS structure. For demonstration, we will present the results recently obtained on a set of MOS devices consisting of metal gate / high-k dielectric stack / Si and III-V high mobility substrate. The examples include [TaN/TaSiN] metal gate / [HfO2/SiO2] dielectric stack / Si substrate and Al metal gate / Al2O3 dielectric / InxGa1-xAs substrate

Citation

Thin Solid Films

Volume

519

Pub Type

Journals

Keywords

Internal Photoemission, spectroscopic ellipsometry, band alighnment, high-k, metal-oxide- semiconductor interfaces

Citation

Nguyen, N. , Kirillov, O. and Suehle, J. (2010), Band Alignment of Metal-Oxide-Semiconductor Structure by Internal Photoemission Spectroscopy and Spectroscopic Ellipsometry, Thin Solid Films (Accessed October 3, 2025)