Ferrites perovskites have exhibited promising p-type conductivity and oxygen evolution reaction (OER) activity. In this work, we investigate heteroepitaxial p-n junctions formed with La0.88Sr0.12FeO3 and n-SrTiO3(001). Sr substitution for La in LaFeO3 is shown to be effective for introducing p-type conductivity, lowering the optical bandgap, and enhancing electrocatalytic OER. A staggered, type-II band alignment with a large built-in potential within the LSFO forms due to the polar interface. This electronic structure facilitates charge transfer across the p-n junction and accounts for the strongly thickness-dependent extent of OER we observe.
Revised: February 21, 2019 |
Published: June 25, 2018
Citation
Wang L., Y. Du, L. Chang, K.A. Stoerzinger, M.E. Bowden, J. Wang, and S.A. Chambers. 2018.Band Alignment and Electrocatalytic Activity at the p-n La0.88Sr0.12FeO3 / SrTiO3(001) Heterojunction.Applied Physics Letters 112, no. 26:261601.PNNL-SA-135023.doi:10.1063/1.5030897