Conductance and I-V characteristics of Au/BPY/Au single molecule junctions
Conductance and I-V characteristics of Au/BPY/Au single molecule junctions
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DOI：
10.1063/1.3212696
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发表时间：
2009-09
影响因子：
4.4
通讯作者：
K. Horiguchi;S. Kurokawa;A. Sakai
中科院分区：
文献类型：
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作者：
K. Horiguchi;S. Kurokawa;A. Sakai
研究了与金电极相连的4，4‘-联吡啶(BPY)单分子在室温下的低偏压电导和I-V特性。利用机械可控断裂结技术，统计确定了Au/bpy/Au单分子结的最优电导值。测得的电导为0.01G0(G0为电导量子单位)，与之前利用扫描隧道显微镜断口进行的两次实验符合得很好。直接测量了Au/BPY/Au结的I-V特性，在保持结处于单分子状态的情况下，通过改变高达±0.5V的偏压来测量结的I-V特性。通过与Au/1，4-苯二硫酚(BDT)/Au结的I-V曲线比较，我们观察到BPY和BDT分子在Au电极上的能级排列不同。
We have investigated the low bias conductance and I-V characteristics of single 4,4′-bipyridine (BPY) molecule connected to gold electrodes at room temperature. Exploiting the mechanical controllable break junction technique we statistically determined the most preferred conductance value of Au/BPY/Au single molecule junctions. The measured conductance, 0.01G0 (G0 is the conductance quantum unit), is in good agreement with two of the previous experiments using scanning tunnel microscopy break junctions. The I-V characteristics of the Au/BPY/Au junction have been directly measured by varying the bias up to ±0.5 V while holding the junction at its single molecule state. By comparing the obtained I-V curves with those of the Au/1,4-benzenedithiol (BDT)/Au junction, we observed differences in the energy level alignment of BPY and BDT molecules with respect to the Au electrode.