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ZnO single crystals were grown by the innovated hydrothermal method. The crystal surfaces were polished, and then studied by atom force microscope (AFM) and wet-chemical etching (WCE). It was found that the Zn polar plane was smoother than O polar plane under the same polishing conditions. The etch pit density of Zn polar plane is 4.3×103 cm-2, which is consistent with the previous report, while the density of etch pit of O polar plane is more than 103 cm-2. After annealing treatment, the density of etch pit of Zn plane reduces to 5.8×102 cm-2 and is superior to the current report. This investigation reveals that the high quality ZnO single crystals with fine Zn polar plane can be obtained by the innovated hydrothermal method.
ZnO was synthesized by the innovated hydrothermal method. The crystal surfaces were polished, and then studied by atom force microscope (AFM) and wet-chemical etching (WCE). It was found that the Zn polar plane was smoother than O polar plane under the same polishing conditions. The etch pit density of Zn polar plane is 4.3 × 103 cm -2, which is consistent with the previous report, while the density of etch pit of O polar plane is more than 103 cm-2. treatment, the density of etch pit of Zn plane reduces to 5.8 × 102 cm -2 and is superior to the current report. This investigation reveals that the high quality ZnO single crystals with fine Zn polar plane can be obtained by the innovated hydrothermal method.