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Role and optimization of the active oxide layer in TiO2-based RRAM

Regoutz, A, Gupta, I, Serb, A, Khiat, A, Borgatti, F, Lee, TL, Schlueter, C, Torelli, P, Gobaut, B, Light, M , Carta, Daniela, Pearce, S, Panaccione, G and Prodromakis, T (2015) Role and optimization of the active oxide layer in TiO2-based RRAM Advanced Functional Materials, 26 (4). pp. 507-513.

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Abstract

TiO2 is commonly used as the active switching layer in resistive random access memory. The electrical characteristics of these devices are directly related to the fundamental conditions inside the TiO2 layer and at the interfaces between it and the surrounding electrodes. However, it is complex to disentangle the effects of film “bulk” properties and interface phenomena. The present work uses hard X-ray photoemission spectroscopy (HAXPES) at different excitation energies to distinguish between these regimes. Changes are found to affect the entire thin film, but the most dramatic effects are confined to an interface. These changes are connected to oxygen ions moving and redistributing within the film. Based on the HAXPES results, post-deposition annealing of the TiO2 thin film was investigated as an optimisation pathway in order to reach an ideal compromise between device resistivity and lifetime. The structural and chemical changes upon annealing are investigated using X-ray absorption spectroscopy and are further supported by a range of bulk and surface sensitive characterisation methods. In summary, it is shown that the management of oxygen content and interface quality is intrinsically important to device behavior and that careful annealing procedures are a powerful device optimisation technique.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
NameEmailORCID
Regoutz, AUNSPECIFIEDUNSPECIFIED
Gupta, IUNSPECIFIEDUNSPECIFIED
Serb, AUNSPECIFIEDUNSPECIFIED
Khiat, AUNSPECIFIEDUNSPECIFIED
Borgatti, FUNSPECIFIEDUNSPECIFIED
Lee, TLUNSPECIFIEDUNSPECIFIED
Schlueter, CUNSPECIFIEDUNSPECIFIED
Torelli, PUNSPECIFIEDUNSPECIFIED
Gobaut, BUNSPECIFIEDUNSPECIFIED
Light, MUNSPECIFIEDUNSPECIFIED
Carta, Danielad.carta@surrey.ac.ukUNSPECIFIED
Pearce, SUNSPECIFIEDUNSPECIFIED
Panaccione, GUNSPECIFIEDUNSPECIFIED
Prodromakis, TUNSPECIFIEDUNSPECIFIED
Date : 15 December 2015
Identification Number : 10.1002/adfm.20150352
Depositing User : Jane Hindle
Date Deposited : 04 Sep 2017 14:14
Last Modified : 04 Sep 2017 14:49
URI: http://epubs.surrey.ac.uk/id/eprint/842157

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