DESIGN AND STUDY OF ONE-DIMENSIONAL ORGANIC CONDUCTORS II: TTF - TCNQ AND OTHER ORGANIC SEMIMETALS
DESIGN AND STUDY OF ONE-DIMENSIONAL ORGANIC CONDUCTORS II: TTF - TCNQ AND OTHER ORGANIC SEMIMETALS
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一维有机导体的设计与研究II：TTF-TCNQ及其他有机半金属
DOI：
10.1007/978-1-4684-2109-5_22
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发表时间：
1974
影响因子：
9.8
通讯作者：
T. Poehler
中科院分区：
文献类型：
--
作者：
A. Bloch;D. Cowan;T. Poehler
上一篇论文中讨论的无序一维导体对于开发具有更高电导率的有机材料有什么意义？简单地说，情况就是这样。在超维、窄带有机电荷转移盐中，我们有金属状态本质上不稳定的体系。抑制不稳定的一种方法是引入足够的无序来“洗掉它们”。正如NMP-TCNQ这样的例子所证明的那样，在有利的情况下，这可以导致电导率的显著增加。尽管如此，结构性混乱本身仍是一个限制因素。费米能级电子态的局域化将电导率限制在几百个倒数欧姆-厘米的扩散范围内--以有机标准衡量是巨大的，但与良好的无机导体相比较低。要将有机电导率提高到真正的金属范围，需要某种方法来抑制变形绝缘体的倾向，而不是诉诸于引入结构无序。因此，我们寻求由没有强偶极矩的对称分子组成的材料，并形成比单一导电链提供更多设计灵活性的结构。
What are the implications of the disordered one-dimensional conductors, discussed in the previous paper, for the development of organic materials of still higher conductivity? Simply, the situation is this. In lover-dimensional, narrow-band organic charge-transfer salts, we have systems in which the metallic state is inherently unstable. One way of suppressing the instabilities is by introducing sufficient disorder to “wash them out”. As demonstrated by examples12 such as NMP-TCNQ, this can lead in favorable circumstances to a spectacular increase in conductivity. Nevertheless the structural disorder remains itself a limiting factor. The localization of the electronic states at the Fermi level limits the conductivity to the diffusive range25 of a few hundred reciprocal ohm-centimeters—enormous by organic standards, but low compared with good inorganic conductors. To elevate organic conductivities into the truly metallic range requires some way of suppressing the tendency toward a distorted insulator without resorting to the introduction of structural disorder. We therefore seek materials consisting of symmetric molecules with no strong dipole moment, and forming structures which offer more flexibility for design than does a single conducting chain.