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Orientation-dependent chemistry and band-bending of Ti on polar ZnO surfaces

Abstract : Orientation-dependent reactivity and band-bending are evidenced upon Ti deposition (1-10 Å) on the polar ZnO(0001)-Zn and ZnO(000 1)-O surfaces. At the onset of the Ti deposition, a downward band-bending was observed on ZnO(000 1)-O while no change occurred on ZnO(0001)-Zn. Combining this with the photoemission analysis of the Ti 2p core level and Zn L3(L2)M45M45 Auger transition, it is established that the Ti/ZnO reaction is of the form Ti + 2 ZnO → TiO2 + 2 Zn on ZnO(0001)-Zn and Ti + y ZnO → TiZnxOy + (y-x) Zn on ZnO(000 1)-O. Consistently, upon annealing thicker Ti adlayers, the metallic zinc is removed to leave ZnO(0001)-Zn surfaces covered with TiO2-like phase and ZnO(000 1)-O surfaces covered with a defined (Ti, Zn, O) compound. Finally, a difference in the activation temperature between the O-terminated (500 K) and Zn-terminated (700 K) surfaces is observed, which is tentatively explained by different electric fields in the space charge layer at ZnO surfaces.
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Submitted on : Wednesday, April 19, 2017 - 3:30:16 PM
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Patrizia Borghetti, Younes Mouchaal, Zongbei Dai, Gregory Cabailh, Stéphane Chenot, et al.. Orientation-dependent chemistry and band-bending of Ti on polar ZnO surfaces. Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2017, 19 (16), pp.10350-10357. ⟨10.1039/C6CP08595D⟩. ⟨hal-01510493⟩



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