【摘要】 报道以块状氧化锌陶瓷为培养料,KOH、LiOH和H2O2的混合水溶液为矿化剂体系,采用水热法生长出尺寸为30mm×38mm×8mm的氧化锌晶体。氧化锌晶体+c(0001)和-c(0001)方向的生长速度分别为0.17,0.09mm/day。+c面的颜色为浅绿色,而-c面的颜色为深褐色。在室温下测得+c面的载流子浓度为104cm-3,电阻率为80Ω·cm,迁移率为100cm2/V·s。晶体(0001)面的双晶摇摆曲线的FWHM为45arc-sec。对氧化锌晶体+c面在室温条件下的光致发光谱和吸收光谱进行了测试分析。更多还原

【Abstract】 Because of the high basicity of mineralizer solution used for growing ZnO crystal, a closed precious inner metal container is essential for preventing the incorporation of impurities from the inner surface of the autoclave and for the growth of high-quality ZnO single crystal. Many researchers used platinum inner contai-ner but Pt is quite costly. In this paper, we report our growth of single ZnO crystals by the hydrothermal method using a gold inner container and the characterization of the grown crystals.ZnO crystals have been grown by the hydrothermal method using a mixed solution of KOH,LiOH and H2O2 as the mineralizer. The growing rates for +c(0001) and -c(0001) direction are 0.17 and 0.09 mm/day, respectively. The impurity concentration was determined by inductively coupled plasma mass spectroscopy (ICP-MS). The crystal-linity of the grown ZnO crystal was characterized by X-ray rocking curve measurement using a Philips X’pert MRD. The absorptivity was tested by a Jasco V-570 UV/Vis/NIR spectrophotometer, and the photoluminescence(PL) exited by a He-Cd laser (λ= 325 nm) was measured at room temperature.The results show that the incorporation of K was under detective limit; Li originated from LiOH was observed in both +c and -c regions. In addition, Au that may be corroded by H2O2 and Si came from the nutrients were also observed by ICP-MS. Other impurity concentrations (such as Al, Fe, Cu, and Pb) of the -c region were much higher than those of the +c region, and the crystal color changes from light green for +c sector to dark brown for -c sector. The full-width at half-maximum (FWHM) of double axis X-ray rocking curve for the polished Zn face cut from +c sector is 45 arcsec. For the +c sector, the resistivity at room temperature is 80 Ω·cm, the carrier concentration is about 104 cm-3, and the mobility is about 100 cm2/V·s.The photoluminescence (PL) spectrum has only a strong UV emission at 376 nm (3.3 eV)from the band edge and the absorption spectrum of +c part of the crystals is very flat between 400 and 1 600 nm at room temperature.更多还原