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It has been experimentally shown that an O(−c)-polar ZnOsurface is more stable than a Zn(+c)-polar surface in H2 ambient. We applied first-principles calculations to investigating the polarity dependence on the stability at the electronic level. The calculations revealed that the −c surface terminated with H atom was stable maintaining a wurtzite structure, whereas the +c surface was unstable due to the change of coordination numbers of Zn at the topmost surface from four (wurtzite) to six (rock salt). This causes the generation of O2 molecules, resulting in instability at the +c surface.


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