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首页> 外文期刊>Materials Science and Engineering >Effect of dopant concentration on structural and optical properties of Cd_(0.7)Zn_(0.3)S semiconducting nanocrystals
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Effect of dopant concentration on structural and optical properties of Cd_(0.7)Zn_(0.3)S semiconducting nanocrystals

机译：掺杂剂浓度对Cd_（0.7）Zn_（0.3）S半导体纳米晶体结构和光学性能的影响

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摘要

Cu single doped and Cu, Mn co-doped Cd_(0.7)Zn_(0.3)S nanocrystals were synthesized successfully by co-precipitation method. XRD results confirmed hexagonal structure of as prepared Cu single doped and Cu, Mn co-doped Cd_(0.7)Zn_(0.3)S samples. The lattice constants, lattice plane, d-spacing, unit cell volume, Lorentz factor and dislocation density were also determined. The SEM analysis shows aggregation and nonuniform shapes of nano-particles. The EDX spectra indicate the presence of S, Cd, Zn, Cu, Mn along with N and O in our samples. Absorption spectra shows maximum absorption in the range 209-236 nm with a shoulder peak at 277-299 nm which confirms a blue shift in comparison to bulk spectra. The photoluminescence (PL) spectra of Cu single doped samples shows blue-green emission centered at 428 and 488 nm. In Cu, Mn co-doped samples, higher intensity in blue green region at 458 and 488 nm attributed due to the sulfur vacancy and Zn defects respectively.
机译：采用共沉淀法成功合成了Cu单掺杂和Cu，Mn共掺杂的Cd_（0.7）Zn_（0.3）S纳米晶体。 XRD结果证实了所制备的Cu单掺杂和Cu，Mn共掺杂的Cd_（0.7）Zn_（0.3）S样品的六方结构。还确定了晶格常数，晶格平面，d-间距，晶胞体积，洛伦兹因子和位错密度。 SEM分析显示出纳米颗粒的聚集和不均匀形状。 EDX光谱表明样品中存在S，Cd，Zn，Cu，Mn以及N和O。吸收光谱显示最大吸收在209-236 nm范围内，在277-299 nm处有一个肩峰，这与本体光谱相比证实了蓝移。 Cu单个掺杂样品的光致发光（PL）光谱显示蓝光发射集中在428和488 nm处。在铜，锰共掺杂的样品中，分别在458和488 nm处的蓝绿色区域具有较高的强度，这分别归因于硫空位和Zn缺陷。

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