Amorphous Copper Tungsten Oxide with Tunable Band Gaps

Le Chen, Sudhakar Shet, Houwen Tang, Kwang Soon Ahn, Heli Wang, Yanfa Yan, John Turner, Mowafak Al-Jassim

Research output: Contribution to journalArticlepeer-review

20 Scopus Citations


We report on the synthesis of amorphous copper tungsten oxide thin films with tunable band gaps. The thin films are synthesized by the magnetron cosputtering method. We find that due to the amorphous nature, the Cu-to-W ratio in the films can be varied without the limit of the solubility (or phase separation) under appropriate conditions. As a result, the band gap and conductivity type of the films can be tuned by controlling the film composition. Unfortunately, the amorphous copper tungsten oxides are not stable in aqueous solution and are not suitable for the application of photoelectrochemical splitting of water. Nonetheless, it provides an alternative approach to search for transition metal oxides with tunable band gaps.

Original languageAmerican English
Article numberArticle No. 043502
Number of pages5
JournalJournal of Applied Physics
Issue number4
StatePublished - 15 Aug 2010

NREL Publication Number

  • NREL/JA-520-47990


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