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   Meanwhile, ZnO, as a polar crystal, its surface is either positively
charged or negatively charged [16,23]. The optimized {0 0 1} surface
has roughly a 60% higher cleavage energy than the nonpolar {1 0 0}
and {1 1 0} faces. ZnO has a dipole moment along (0 0 1) direction.
These properties suggest that the c-axis is the fastest growth
directionand the ZnO{0 0 1}has the highest energy of the low-index
surface [16,23]. ZnO grow along this direction easily.

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