Rapid growth of fully-inorganic flexible CaxCoO2 thin films from a ligand free aqueous precursor ink for thermoelectric applications. Issue 54 (18th June 2019) - Sinha, Tridib Kumar
Abstract : We report a ligand-free green approach to rapidly grow flexible nanoporous Ca0.35 CoO2 thin films from a stable precursor-ink for wide temperature-range thermoelectric applications. Abstract : We demonstrate a ligand-free green chemical method for the rapid growth of nanoporous Ca0.35 CoO2 thin films on sapphire and mica substrates from a water-based precursor ink, formulated by dissolving the precursor solid, composed of in situ prepared Ca 2+ –DMF and Co 2+ –DMF complexes. Mica serves as the flexible substrate as well as the sacrificial layer for the film transfer. Despite the presence of nanopores, the power factor of the flexible film Ca0.35 CoO2 -on-mica is above 0.50 × 10 −4 W m −1 K −2 at around room temperature. The present technique is simple and cost-effective.