Temperature dependence of charge transport in solid-state molecular junctions based on oligo(phenylene ethynylene)s
Temperature dependence of charge transport in solid-state molecular junctions based on oligo(phenylene ethynylene)s
复制标题
基于低聚苯乙炔的固态分子结中电荷传输的温度依赖性
DOI：
10.1088/1361-6528/ab6681
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发表时间：
2020
期刊：
影响因子：
3.5
通讯作者：
Zhongming Wei
中科院分区：
文献类型：
--
作者：
Yuqing Liu;Mianzeng Zhong;Elisabeth Ffion Downey;Xiaoyao Chen;Tao Li;Kasper Nørgaard;Zhongming Wei
分子电子学的最终目标是实现实际应用。为了接近目标，我们成功地制造了基于寡聚苯乙炔（OPE）和带有扩展四硫富瓦烯（TTF）（OPE3和OPE3-TTF）带有二胺锚定基团的自组装单层（SAM）的十字形OPE的固态结。 SAM 被限制在带有金基底的微孔中，以确保明确的器件表面积。传输特性是在双结布局上进行的，rGO 薄膜用于相邻 SAM 之间的顶部接触和互连。由于掺入了 TTF 部分，基于 OPE3-TTF SAM 的固态器件在环境条件下表现出预期的更高电导率。随着温度降低，这两种器件表现出不同程度的温度依赖性，这是由于交叉共轭 OPE3-TTF 分子表现出量子干涉，而线性共轭 OPE3 分子则没有。该研究展示了基于十字形OPE的分子器件电性能的温度依赖性，进一步丰富了功能分子器件的研究成果。
The ultimate goal of molecular electronics is to achieve practical applications. For approaching the target, we have successfully fabricated solid-state junctions based on oligo(phenylene ethynylene)s (OPEs) and cruciform OPEs with extended tetrathiafulvalene (TTF) (OPE3 and OPE3-TTF) self-assembled monolayers (SAMs) with a diamine anchoring group. SAMs were confined in micropores with gold substrates to ensure well-defined device surface areas. The transport properties were conducted on a double-junction layout, which the rGO films used for top contacts and interconnects between adjacent SAMs. The solid-state devices based on OPE3-TTF SAMs showed the expected higher conductance under ambient conditions because of the incorporation of a TTF moiety. The two devices displayed varying degrees of temperature dependence with decreasing temperature, which resulted from the cross-conjugated OPE3-TTF molecule exhibiting quantum interference while the linear-conjugated OPE3 molecule did not. This study shows the temperature dependence of the electrical properties of molecular devices based on cruciform OPEs, further enriching the research results of functional molecular devices.