Visualization of dynamic metastable states evolution in TiO2 memristor during electroforming by electroluminescence

Author:

Cao XinyuORCID,Meng YangORCID,Wang Li,Wang ZhenORCID,Zhao HongwuORCID

Abstract

Abstract The electroforming process, transforming a homogeneous insulating oxide into localized conductive filaments, is crucial for memristive devices. However, it is still unclear how the intermediate phases develop microscopically throughout the transient forming process. Here, we investigate the nonequilibrium dynamic phase transition in the conductive region of TiO2 memristors during electroforming. Synchronous electroluminescence emission and transport measurements demonstrate that the application of pulse fields primarily causes a gradual reduction in the conducting area, accompanied by the reversible field-dependent evolution of metastable phases at the cathode region. As a result of positive feedback between the lateral gradient of oxygen vacancies and the electric field, the self-reinforcing process eventually facilitates the final filament generation. This study offers insights into the physical mechanisms governing the metastable phase evolution during electroforming and raises implications for optimizing the forming process of memristive devices.

Funder

Strategic Priority Research Program of the Chinese Academy of Sciences

National Natural Science Foundation of China

Publisher

IOP Publishing

Subject

Surfaces, Coatings and Films,Acoustics and Ultrasonics,Condensed Matter Physics,Electronic, Optical and Magnetic Materials

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