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Internal Photoemission Spectroscopy of [TaN/TaSiN] and [TaN/TaCN] Metal Stacks On SiO2 and [HfO2 / SiO2] Dielectric Stack.

Published

Author(s)

Nhan V. Nguyen, Hao Xiong, John S. Suehle, Oleg A. Kirillov, Eric Vogel, Prashant Majhi, Huang-Chun Wen

Abstract

Metal gates have been intensively searched to replace the poly-silicon for the next generation metal-oxide-semiconductor field-effect transistor. The barrier height (??0) at their interfaces with a gate dielectric must be known to select a suitable metal. In this letter, internal photoemission was used to determine ??0 of two important ternary metals: [TaN/TaSiN] and [TaN/TaCN] on a single SiO2 layer and a [HfO2/SiO2] stack. On SiO2, ??0 was found to be 3.36 eV and 3.55 eV at [TaN/TaSiN] stack] / SiO2 and [TaN/TaCN stack] / SiO2 interfaces, respectively. However, on the [HfO2/SiO2] stack, ??0 was found pinning at 2.5 eV. For comparisons, flat band voltage measurements will also be presented.
Citation
Applied Physics Letters
Volume
92

Keywords

C-V, Gate Dielectrics, HfO2, Interface Barrier Height, Internal Photoemission, Metat Gates, SiO2, TaCN, TaSiN
Created March 6, 2008, Updated January 27, 2020