Transport properties of single-component organic conductors, TED derivatives
Transport properties of single-component organic conductors, TED derivatives
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单组分有机导体的传输特性、TED 衍生物
DOI：
10.1039/c7me00029d
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发表时间：
2017
影响因子：
3.6
通讯作者：
Y. Takeda and S. Yagyu
中科院分区：
文献类型：
--
作者：
Y. KobayashiY. .;J.-B. Vaney;T. Mori;Y. Matsushita;T. Terauchi;Y. Takeda and S. Yagyu
窄禁带半导体具有高的导电性和迁移率，是一类重要的应用材料，特别是热电和光学器件的应用。在这里，我们设计并合成了新型的有机窄禁带半导体，它是一种单组分纯有机金属四硫富瓦烯扩展二羧酸盐(TED)的主骨架的修饰形式。即使在使用粉末晶体样品时，骨架上带有取代基的TED衍生物的分子设计也可以获得高导电性的半导体。它们的热电势比不带取代基的金属TED的热电势大，证明了通过分子设计成功地调节了TED体系的载流子浓度。近/中红外漫反射测量揭示了每个禁带，从光谱中提取的光学参数通过基于Drude-Lorentz介电函数的拟合计算评估了TED衍生物的载流子浓度和迁移率。
Narrow-gap semiconductors with high conductivity and mobility are an important class of materials for various applications, especially for thermoelectric and optical device applications. Herein, we designed and synthesized novel organic narrow-gap semiconductors, which are modified forms of the main skeleton of a single-component pure organic metal, tetrathiafulvalene-extended dicarboxylate (TED). Molecular design of the TED derivatives with substituent groups on the skeleton led to highly-conducting semiconductors even when powder crystalline samples were used. Their thermopower is greater than that of metallic TED without a substituent group, demonstrating the successful tuning of carrier concentration in the TED system by molecular design. Near-/middle-infrared (IR) diffuse reflectance measurements revealed each band gap, and optical parameters extracted from the spectra evaluated the carrier concentration and mobility of the TED derivatives with fitting calculations on the basis of a Drude–Lorentz dielectric function.