Resistive switching behavior and multiple transmittance states in solution-processed tungsten oxide

Wei Ting Wu, Jih Jen Wu, Jen Sue Chen

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


In this work, a tungsten oxide (WOx) film is prepared using a thiourea-assisted solution process. We demonstrate a device composed of fluorine doped tin oxide (FTO)-glass/WOx/electrolyte/indium-tin oxide (ITO)-glass stacking electrochromic (EC) structure and Al electrodes that are locally patterned and interposed between the WOx film and electrolyte, which form an Al(top electrode)/WOx/FTO(bottom electrode) resistance random access memory (RRAM) unit. According to transmission electron microscopy and X-ray photoelectron spectroscopy analyses, the WOx film contains nanosize pores and metallic-tungsten nanoclusters which are scattered within the tungsten oxide layer and concentrated along the interface between the Al electrode and WOx film. With application of voltage to the ITO electrode, multiple transmittance states are achieved for the EC unit due to the different quantity of intercalated Li ions in the WOx film. As for the Al/WO x/FTO RRAM unit, a bipolar nonvolatile resistive switching behavior is attained by applying voltage on the Al top electrode, showing electrical bistability with an ON/OFF current ratio up to 1 × 104.

Original languageEnglish
Pages (from-to)2616-2621
Number of pages6
JournalACS Applied Materials and Interfaces
Issue number7
Publication statusPublished - 2011 Jul 27

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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