Conductivity Mechanisms in Sb-Doped SnO2 Nanoparticle Assemblies: DC and Terahertz Regime
Conductivity Mechanisms in Sb-Doped SnO2 Nanoparticle Assemblies: DC and Terahertz Regime
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DOI：
10.1021/acs.jpcc.5b05091
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发表时间：
2015-08
影响因子：
3.7
通讯作者：
V. Skoromets;H. Němec;J. Kopeček;P. Kužel;K. Peters;D. Fattakhova‐Rohlfing;A. Vetushka;Martin Müller;K. Ganzerová;A. Fejfar
中科院分区：
文献类型：
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作者：
V. Skoromets;H. Němec;J. Kopeček;P. Kužel;K. Peters;D. Fattakhova‐Rohlfing;A. Vetushka;Martin Müller;K. Ganzerová;A. Fejfar
采用非水Sol-Gel法制备了未掺杂和掺Sb的二氧化锡纳米颗粒，并将其压制成颗粒，并在不同条件下进行了热处理，用时域太赫兹光谱、扫描电子显微镜、原子力显微镜和直流电导测量对其进行了研究。这些方法的结合使得解决由材料的固有属性和样品的形态所施加的导电性限制成为可能。在所有样品中都证实了纳米颗粒的渗流。未掺杂样品表现出较弱的跳跃电导，而掺杂样品中主要是部分局限于纳米颗粒中的带状电荷导电。在样品制备过程中，纳米颗粒的导电性和连接性可以很好地控制，即通过焙烧温度和工艺步骤的顺序来控制。纳米颗粒内部的导电性和纳米颗粒之间的电荷传输显著增加。
Assemblies of undoped and antimony-doped tin oxide nanoparticles synthesized via a nonaqueous sol–gel procedure, pressed into pellets, and annealed under various conditions were investigated using time-domain terahertz spectroscopy, scanning electron microscopy, atomic force microscopy, and dc conductivity measurements. Combination of these methods made it possible to resolve the conductivity limitations imposed by intrinsic properties of the material and by the morphology of the samples. Percolation of the nanoparticles was confirmed in all samples. The undoped samples exhibit a weak hopping conductivity, whereas bandlike conduction of charges partially confined in the nanoparticles dominates in the doped samples. The conductivity of nanoparticles and their connectivity can be greatly controlled during the sample preparation, namely by the calcination temperature and by the order of technological steps. A substantial increase of the conductivity inside nanoparticles and of the charge transport between th...