Towards low voltage resistive switch in sol-gel derived TiO2/Ta2O5 stack thin films. (5th September 2016)

• Record Type: Journal Article
• Authors: Prusakova, Valentina; Collini, Cristian; Lunelli, Lorenzo; Vanzetti, Lia; Chiappini, Andrea; Lorenzelli, Leandro; Pederzolli, Cecilia; Chiasera, Alessandro; Ferrari, Maurizio; Dirè, Sandra
• Is Part Of: Materials & design. Volume 105(2016)
• Page Start: 359
• Page End: 365
• Publication Date: 2016-09-05
• Subjects: Memristive response -- Tantalum pentoxide -- Titanium dioxide -- Sol-gel -- Thin films; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2016.05.086
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: Herein, we report a memristive response from Pt/TiO2 /Ta2 O5 /Pt stack thin films with low SET and RESET voltages, and resistance ratio of 10 3 . For the first time, Pt/TiO2 /Ta2 O5 stack thin films were produced by sol-gel procedure. The morphology and elemental composition of Pt/TiO2 /Ta2 O5 stacks were studied by a set of complementary techniques, including scanning electron microscopy (SEM), field-emission electron microscopy (FE-SEM), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS). The thickness of the material was estimated from the transmittance spectrum by Pointwise Unconstrained Optimization Approach (PUMA). Graphical abstract: Highlights: Pt/TiO2 /Ta2 O5 stacks as memristive building blocks were fabricated by the sol-gel method for the first time. The developed sol-gel route towards Ta2 O5 film fabrication relies on relatively inexpensive TaCl5 precursor. The fabricated defect-free Pt/TiO2 /Ta2 O5 stacks represent suitable building blocks for memristor cell fabrication. The memristive cells, Pt/TiO2 /Ta2 O5 /Pt (tip), displayed a narrow switching voltage window and a high resistance ratio (10 3 ). The narrow window of the switching voltage in memristor opens a possibility of coupling it to neuron.