Reactive Inorganic Vapor Deposition of Perovskite Oxynitride Films for Solar Energy Conversion.

ABSTRACT: The synthesis of perovskite oxynitrides, which are promising photoanode candidates for solar energy conversion, is normally accomplished by high-temperature ammonolysis of oxides and carbonate precursors, thus making the deposition of their planar films onto conductive substrates challenging. Here, we proposed a facile strategy to prepare a series of perovskite oxynitride films. Taking SrTaO2N as a prototype, we prepared SrTaO2N films on Ta foils under NH3 flow by utilizing the vaporized SrCl2/SrCO3 eutectic salt. The SrTaO2N films exhibit solar water-splitting photocurrents of 3.0?mA?cm-2 at 1.23?V vs. RHE (reversible hydrogen electrode), which increases by 270% compared to the highest photocurrent (1.1?mA?cm-2 at 1.23?V vs. RHE) of SrTaO2N reported in the literature. This strategy may also be applied to directly prepare a series of perovskite oxynitride films on conductive substrates such as ATaO2N (A = Ca, Ba) and ANbO2N (A = Sr, Ba).

SUBMITTER: Fang T 

PROVIDER: S-EPMC6946269 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature