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Abstract White and fluffy Al-doped zinc oxide powders were fabricated using ZnO and Al(C3H7O)3 powders by a solid statemethod.The effects of Al doping on microstructure, electrical and optical properties were systematically studied. XRDand Raman results showthat the Al-doped powders have a pure hexagonal wurtzite structure. The resistivity of ZnO could be decreased from 108 to 102 X cm with the Al doped concentration of 3 at.%. Meanwhile, the obtained powders exhibited high diffuse reflectance in visible region, intense UV emission without deep level emission and good environmental stability. Results reveal that the optical property of the powders has an intimate relationship with the electrical property. The decline of the diffuse reflectance at visible wavelengths and the strong IR absorption were due to the increase of the free electron concentration. Al doping leads to quenching of defect related visible band emission, and we surmise that the defect centers are mainly related to oxygen vacancies (VO) and zinc vacancies (VZn). Al doping mechanism was also tentatively explored. |
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爱与雨下: 金币+2 2012-04-11 19:29:22
爱与雨下: , 欢迎常来~！ 2012-04-11 19:29:30
sltmac: 金币+10, 翻译EPI+1 2012-04-21 09:08:32
爱与雨下: 金币+2 2012-04-11 19:29:22
爱与雨下: , 欢迎常来~！ 2012-04-11 19:29:30
sltmac: 金币+10, 翻译EPI+1 2012-04-21 09:08:32
| 本文采用固相法利用ZnO和Al(C3H7O)3粉末制备了白色蓬松的铝掺杂氧化锌粉末，系统地研究了铝的掺杂对材料微结构、电学性质和光学性质的影响。XRD图谱和拉曼光谱结果表明铝掺杂的氧化锌粉末具有六方纤锌矿结构。当铝掺杂量为3%原子数百分含量时，氧化锌的电阻率可从掺杂前的108 X cm 降低到掺杂后的102 X cm 。同时，所得的粉末在可见光区表现出高漫反射率，具有强紫外光致发光而几乎没有深能级发射现象，且环境稳定性良好。研究结果还表明粉末的光学性质与其电学性质密切相关。材料在可见波长范围内漫反射率的降低和强烈的红外吸收是因为自由电子浓度的增加而引起的。铝的掺杂导致了晶格缺陷引起的可见光区光致发光的猝灭，并且本文认为这些缺陷中心主要与氧和锌缺陷有关。本文还初步研究了铝掺杂的机制。 |
2楼2012-04-07 16:22:14