access icon openaccess Graphene oxide thin films for resistive memory switches

The presence of voltage controlled negative differential resistance was observed in conduction characteristics recorded at room temperature for 300 nm thick spin-coated films of graphene oxide (GO) sandwiched between indium tin oxide (ITO) substrates and top electrodes of sputtered gold (Au) film. The GO crystallites were found from the X-ray diffraction studies to have an average size in the order of 7.24 nm and to be preferentially oriented along (001) plane. Raman spectroscopy suggested that the material consisted of multilayer stacks with the defects being located at the edges with an average distance of 1.04 nm apart. UV visible spectroscopy studies suggested that the band gap of the material was 4.3 eV, corresponding to direct transitions. The two-terminal ITO/GO/Au devices exhibited memristor characteristics with scan-rate dependent hysteresis, threshold voltage and On/Off ratios. A value of >104 was obtained for On/Off ratio at a scan rate of 400 mVs−1 and 4.2 V.

Inspec keywords: multilayers; sputter deposition; memristors; switches; metallic thin films; ultraviolet spectra; resistive RAM; graphene; Raman spectra; indium compounds; spin coating; visible spectra; X-ray diffraction

Other keywords: temperature 293 K to 298 K; resistive memory switches; GO crystallites; top electrodes; band gap; two-terminal ITO-GO-Au devices; X-ray diffraction; indium tin oxide substrates; size 300 nm; sputtered gold film; scan-rate dependent hysteresis; Raman spectroscopy; spin coated films; memristor characteristics; UV visible spectroscopy; graphene oxide thin films; ITO-CO-Au; conduction characteristics; voltage controlled negative differential resistance; multilayer stacks; ITO substrates

Subjects: Memory circuits; Resistors; Semiconductor storage; Relays and switches

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http://iet.metastore.ingenta.com/content/journals/10.1049/iet-cds.2015.0170
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