在1.5-7.5纳米的Oligophenylene Imine分子电线中进行DC和AC传输的比较:Eutectic Ga-In与传导探头原子力显微镜连接
C S Suchand Sangeeth1, Abel T Demissie2, Li Yuan1
1Department of Chemistry, National University of Singapore , 3 Science Drive 3, Singapore 117543.
Journal of the American Chemical Society
|May 13, 2016
概括
我们测量了结合性寡烯胺 (OPI) 分子中的电传输, 发现从道到跳转的交换机在4纳米. 这项研究揭示了分子电子和介电性质的关键见解.
科学领域:
- 分子电子
- 凝聚物质物理学
- 材料科学
背景情况:
- 结合性寡烯胺 (OPI) 分子用于电子应用.
- 了解分子电线中的电荷传输机制对于纳米尺度设备的开发至关重要.
研究的目的:
- 研究不同长度的OPI分子膜的直流和交流传输特性.
- 在OPI分子电线中确定介电常数和电荷传输模式 (道化与跳跃).
主要方法:
- 在AU-S-OPI//GaOx/EGaIn连接处使用直流和交流传输测量.
- 在AU表面使用imine凝结化学合成的OPI薄膜.
- 采用近边X射线吸收细结构 (NEXAFS) 光谱来确定分子倾斜角度.
主要成果:
- 观察到从道运输到跳跃运输的交叉约为4纳米的分子长度.
- 对于具有0.245±0.008 eV的激活能量,长于4 nm的OPI导线,确定了激活传输.
- 导电率对分子长度的量化指数依赖 (β = 2.84 nm-1 道化,β = 1.01 nm-1 跳跃) 和介电常数为 4.3 ± 0.2.
结论:
- 这项研究提供了对OPI分子电线中的电荷传输的全面了解.
- 确定了不同的传输模式和量化的关键电子参数,包括介电性质.
- 突出了金属分子接触电阻对绝对连接电阻值的影响.
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