摘要:
报道了利用ZnO和Li_2O混合物在5GPa,1200℃—1500℃条件下,制备Li掺杂P型ZnO（记作ZnO：Li）固溶体的过程.研究发现,高压下温度对于ZnO：Li固溶体的导电类型以及结构具有较大的影响.其中在1500℃条件下烧结的ZnO：Li（Li的掺杂量4.5%）表现出良好的p型电学性能,其电阻率为3.1×10~（-1）Ω·cm,载流子浓度为3.3×10~（19）cm~（-3）,迁移率为27.7cm~2·V~（-1）·s~（-1）.通过实验及理论计算确定了其受主能级为110meV,讨论了压力对p型ZnO的形成和电学性能的影响.
Abstract:
In this paper,stable Li-doped ZnO solid solution（ZnO：Li） is successfully prepared by sintering the mixture of ZnO and Li_2O powders under a pressure of 5 GPa and at temperatures between 1200℃and 1500℃.It is found that the high pressure and temperature conditions have significant effects on the electrical conductivity and the structure of the ZnO solid solution.The best p-type ZnO doping 4.5 at.%Li with a resistivity of 3.1×10~（-1）Ω·cm,carrier concentration of 3.3×10~（19）cm~（-3）,and mobility of 27.7 cm/V·s is achieved at 1500℃.The p-type conduction formed in ZnO is due to acceptor formed by one substitutional Li atom at Zn site,which has an acceptor level of 110 meV.Furthermore,the effects of pressure on formation and electrical properties of the p-type ZnO are discussed.
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