Nitrogen-doped, p-type ZnO thin films were grown successfully on sapphire (0001) substrates by using atomic layer epitaxy (ALE). Zn(C2H5)2 [Diethylzinc, DEZn], H2O and NH3 were used as a zinc precursor, an oxidant and...Nitrogen-doped, p-type ZnO thin films were grown successfully on sapphire (0001) substrates by using atomic layer epitaxy (ALE). Zn(C2H5)2 [Diethylzinc, DEZn], H2O and NH3 were used as a zinc precursor, an oxidant and a doping source gas, respectively. The lowest electrical resistivity of the p-type ZnO films grown by ALE and annealed at 1000 ℃ in an oxygen atmosphere for 1 h was 18.3 Ω·cm with a hole concentration of 3.71×1017 cm-3. Low temperature-photoluminescence analysis and time-dependent Hall measurement results support that the nitrogen-doped ZnO after annealing is a p-type semiconductor.展开更多
用融熔法研制了 In_2O_3和 ITO(In_2O_3掺杂 Sn)单晶,并对其光电性能进行研究.纯 ITO 是一种简并半导体,在常温下,以晶格声子散射为主要的载流子传输机理.对 ITO 单晶,给出了载流子浓度与 Sn 掺杂浓度及载流子迁移率的关系.并对在单晶...用融熔法研制了 In_2O_3和 ITO(In_2O_3掺杂 Sn)单晶,并对其光电性能进行研究.纯 ITO 是一种简并半导体,在常温下,以晶格声子散射为主要的载流子传输机理.对 ITO 单晶,给出了载流子浓度与 Sn 掺杂浓度及载流子迁移率的关系.并对在单晶中由于用助溶剂而引入的 Pb 掺杂对材料电性能的影响作了探讨.从材料的吸收光谱图中的本征吸收限的变化及 Plasma 频率和坡度的变化,证实了我们对电性能测试的结果.EXAFS 结构测试结果给出了这二种材料导电率变化的因素.展开更多
Accurate solid concentration measurement plays a key role in the process industry. Measurements analyzed offline can be used to estimate process efficiencies, to identify problems in a flow, and to validate computatio...Accurate solid concentration measurement plays a key role in the process industry. Measurements analyzed offline can be used to estimate process efficiencies, to identify problems in a flow, and to validate computational models. Online measurements can be used for active control. Electrical capacitance tomography （ECT） is a unique measuring technique with great potential in multiphase flow measurement. Experimental studies are carried out on a solid concentration measurement in a cyclone separator dipleg, using ECT. In this experiment eight electrodes are selected for the ECT sensor that is placed on the straight tube of the dipleg. The fluctuating characteristics according to the screw feeder and the effect of the airflow rate from the top of the cyclone are analyzed. The feasibility andreliability of the method are verified by the experimental results.展开更多
文摘Nitrogen-doped, p-type ZnO thin films were grown successfully on sapphire (0001) substrates by using atomic layer epitaxy (ALE). Zn(C2H5)2 [Diethylzinc, DEZn], H2O and NH3 were used as a zinc precursor, an oxidant and a doping source gas, respectively. The lowest electrical resistivity of the p-type ZnO films grown by ALE and annealed at 1000 ℃ in an oxygen atmosphere for 1 h was 18.3 Ω·cm with a hole concentration of 3.71×1017 cm-3. Low temperature-photoluminescence analysis and time-dependent Hall measurement results support that the nitrogen-doped ZnO after annealing is a p-type semiconductor.
文摘用融熔法研制了 In_2O_3和 ITO(In_2O_3掺杂 Sn)单晶,并对其光电性能进行研究.纯 ITO 是一种简并半导体,在常温下,以晶格声子散射为主要的载流子传输机理.对 ITO 单晶,给出了载流子浓度与 Sn 掺杂浓度及载流子迁移率的关系.并对在单晶中由于用助溶剂而引入的 Pb 掺杂对材料电性能的影响作了探讨.从材料的吸收光谱图中的本征吸收限的变化及 Plasma 频率和坡度的变化,证实了我们对电性能测试的结果.EXAFS 结构测试结果给出了这二种材料导电率变化的因素.
基金Supported by the National Natural Science Foundation of China （60672151, 60532020）.
文摘Accurate solid concentration measurement plays a key role in the process industry. Measurements analyzed offline can be used to estimate process efficiencies, to identify problems in a flow, and to validate computational models. Online measurements can be used for active control. Electrical capacitance tomography （ECT） is a unique measuring technique with great potential in multiphase flow measurement. Experimental studies are carried out on a solid concentration measurement in a cyclone separator dipleg, using ECT. In this experiment eight electrodes are selected for the ECT sensor that is placed on the straight tube of the dipleg. The fluctuating characteristics according to the screw feeder and the effect of the airflow rate from the top of the cyclone are analyzed. The feasibility andreliability of the method are verified by the experimental results.
