论文标题
有机分子系统中2D限制电子热电传输的异常缩放定律
Anomalous scaling law for thermoelectric transport of 2D-confined electrons in an organic molecular system
论文作者
论文摘要
低尺寸的限制电子托管较小电子设备以及先进的能源技术的理想材料功能。热电学是一个最引人入胜的例子，因为尺寸在人工二维（2D）结构中进行了实验检查，从而使状态的电子密度显着修饰，从而导致热电图增强。但是，在具有强大的2D字符（例如铜）的分层材料中实现了这种增强的热电器，这仍然是一个空旷的问题。在这里，我们报告了在分层有机化合物$α$ - （bedt-ttf）$ _ 2 $ i $ _3 $中的热电器的异常增强，其中BEDT-TTF代表Bis（Ethylenedithio）-tetrathiafulvalene。我们发现，jonker图中的坡度（热电$ s $ vs.对数的电导率$ \logσ$），$α$ - （bedt-tttf）$ _ 2 $ _ 2 $ i $ _3 $明显大于常规半导体。此外，在相关的分层盐中还可以看到大坡度，这表明了2D有机载体对分层有机物对热电性的影响。
Confined electrons in low dimensions host desirable material functions for downscaled electronics as well as advanced energy technologies. Thermoelectricity is a most fascinating example, since the dimensionality modifies the electron density of states dramatically, leading to enhanced thermopower as experimentally examined in artificial two-dimensional (2D) structures. However, it is still an open question whether such an enhanced thermopower in low dimensions is realized in layered materials with strong 2D characters such as cuprates. Here, we report unusual enhancement of the thermopower in the layered organic compound $α$-(BEDT-TTF)$_2$I$_3$, where BEDT-TTF stands for bis(ethylenedithio)-tetrathiafulvalene. We find that the slope in the Jonker plot (thermopower $S$ vs. logarithm of electrical conductivity $\logσ$) for $α$-(BEDT-TTF)$_2$I$_3$ is significantly larger than that of conventional semiconductors. Moreover, the large slope is also seen in the related layered salt, demonstrating the impact of the 2D-confined carriers in the layered organics on thermoelectricity.
