A Neural Network Approach towards Generalized Resistive Switching Modelling

• Main Authors: Guilherme Carvalho, Maria Pereira, Asal Kiazadeh, Vítor Grade Tavares
• Format: Article
• Language: English
• Published: MDPI AG 2021-09-01
• Series: Micromachines
• Subjects: resistive switching; artificial neural network (ANN); a-IGZO; device modelling
• Online Access: https://www.mdpi.com/2072-666X/12/9/1132

Resistive switching behaviour has been demonstrated to be a common characteristic to many materials. In this regard, research teams to date have produced a plethora of different devices exhibiting diverse behaviour, but when system design is considered, finding a ‘one-model-fits-all’ solution can be quite difficult, or even impossible. However, it is in the interest of the community to achieve more general modelling tools for design that allows a quick model update as devices evolve. Laying the grounds with such a principle, this paper presents an artificial neural network learning approach to resistive switching modelling. The efficacy of the method is demonstrated firstly with two simulated devices and secondly with a <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>4</mn><mo> </mo><msup><mrow><mi mathvariant="sans-serif">μ</mi><mi mathvariant="normal">m</mi></mrow><mn>2</mn></msup></mrow></semantics></math></inline-formula> amorphous IGZO device. For the amorphous IGZO device, a normalized root-mean-squared error (NRMSE) of 5.66 × 10⁻³ is achieved with a <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>[</mo><mn>2</mn><mo>,</mo><mo> </mo><mn>50</mn><mo>,</mo><mn>50</mn><mo> </mo><mo>,</mo><mn>1</mn><mo>]</mo></mrow></semantics></math></inline-formula> network structure, representing a good balance between model complexity and accuracy. A brief study on the number of hidden layers and neurons and its effect on network performance is also conducted with the best NRMSE reported at 4.63 × 10⁻³. The low error rate achieved in both simulated and real-world devices is a good indicator that the presented approach is flexible and can suit multiple device types.