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Effect of Stoichiometry of TiN Electrode on the Switching Behavior of TiN/HfOx/TiN Structures for Resistive RAM

Published online by Cambridge University Press:  17 February 2014

Katrina A. Morgan ,
Ruomeng Huang ,
Stuart Pearce ,
Le Zhong ,
Liudi Jiang  and
C. H. de Groot
Katrina A. Morgan
Affiliation:
Nano Research Group, Electronics and Computer Science, University of Southampton, Southampton, Hampshire, SO171BJ, UK.
Ruomeng Huang
Affiliation:
Nano Research Group, Electronics and Computer Science, University of Southampton, Southampton, Hampshire, SO171BJ, UK.
Stuart Pearce
Affiliation:
Nano Research Group, Electronics and Computer Science, University of Southampton, Southampton, Hampshire, SO171BJ, UK.
Le Zhong
Affiliation:
Engineering Materials Research Group, University of Southampton, Southampton, Hampshire, SO171BJ, UK.
Liudi Jiang
Affiliation:
Engineering Materials Research Group, University of Southampton, Southampton, Hampshire, SO171BJ, UK.
C. H. de Groot
Affiliation:
Nano Research Group, Electronics and Computer Science, University of Southampton, Southampton, Hampshire, SO171BJ, UK.
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Abstract

Two types of TiN/HfOx/TiN devices have been fabricated where the top 200nm TiN electrode has been deposited by two different sputtering methods; reactive, using a titanium target in a nitrogen environment, and non-reactive, using a titanium nitride target. Characterization of the materials shows that the reactive TiN is single-phase stoichiometric TiN with a sheet resistance of 7Ω/square. The non-reactive TiN has a sheet resistance of 300Ω/square and was found to contain significant amounts of oxygen. The resistive switching behavior differs for both devices. The reactive stoichiometric TiN device results in bipolar switching with a Roff/Ron ratio of 50. The non-reactive TiN results in unipolar switching with a Roff/Ron ratio of more than 103, however this device shows poor reproducibility. These results show that an oxygen rich layer between the top electrode and insulator affects the Roff value. It supports the theory of oxygen vacancies leading to the formation of conductive filaments.

Keywords

sputteringoxidechemical composition
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1631: Symposium P – Emergent Electron Transport Properties at Complex Oxide Interfaces , 2014 , mrsf13-1631-p03-01
Copyright
Copyright © Materials Research Society 2014 

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