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• W2890568756 abstract "Fe2O3 is one of the promising oxide semiconductors as photoanodes for photoelectrochemical water splitting, but its efficiency is still limited by the short diffusion length of photo-excited carriers. Using the internal electric field formed at a p-n heterojunction (HJ) is an efficient strategy to mitigate such limitation. Accordingly, the interfacial atomic structure and band alignment are the most crucial parameters for efficiency optimization. In this work, we report on the epitaxial growth and determination of the band energy alignment of NiO/Fe2O3 p-n heterojunction grown on Al2O3(0 0 0 1) substrate by pulsed laser deposition. We show that high crystalline quality NiO(1 1 1) thin films can be grown on Fe2O3(0 0 0 1) with epitaxial relationships of 1¯11NiO||0001¯Fe2O3(out-of-plane), 1¯1¯0NiO||011¯0Fe2O3 and 1¯12¯NiO||21¯1¯0Fe2O3(in-plane). The rotation of NiO hexagons by 30° can effectively reduce the lattice mismatch from ∼17.4% to ∼1.58%. High resolution X-ray photoelectron spectroscopy reveals that valence and conduction band offset of NiO/Fe2O3 heterojunction are 0.6 eV and 2.2 eV, respectively. Furthermore, our results also indicate that the energy level of Ni 3d is higher than the valence band maximum of Fe2O3. This kind of interfacial electronic structure not only facilitates the charge separation, but lowers the overpotentials for oxygen evolution reaction." @default.
• W2890568756 created "2018-09-27" @default.
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• W2890568756 date "2019-01-01" @default.
• W2890568756 modified "2023-09-27" @default.
• W2890568756 title "Epitaxial growth and band alignment of p-NiO/n-Fe2O3 heterojunction on Al2O3(0 0 0 1)" @default.
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• W2890568756 doi "https://doi.org/10.1016/j.apsusc.2018.09.106" @default.
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