The experimental investigation of intermolecular charge transport in π-conjugated materials is challenging. Herein, we describe the investigation of charge transport through intermolecular and intramolecular paths in single-molecule and single-stacking thiophene junctions by the mechanically controllable break junction (MCBJ) technique. We found that the ability for intermolecular charge transport through different single-stacking junctions was approximately independent of the molecular structure, which contrasts with the strong length dependence of conductance in single-molecule junctions with the same building blocks, and the dominant charge-transport path of molecules with two anchors transited from an intramolecular to an intermolecular path when the degree of conjugation increased. An increase in conjugation further led to higher binding probability owing to the variation in binding energies, as supported by DFT calculations.

中文翻译：

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基于噻吩的单堆叠结的结构无关电导。

在π共轭材料中进行分子间电荷传输的实验研究具有挑战性。在本文中，我们描述了通过机械可控制的断裂连接（MCBJ）技术通过单分子和单堆叠噻吩连接中的分子间和分子内路径进行电荷传输的研究。我们发现分子间电荷通过不同的单堆叠结传输的能力大约与分子结构无关，这与具有相同结构单元的单分子结中电导的强长度依赖性以及主要的电荷传输路径形成对比。当结合程度增加时，具有两个锚的分子从分子内路径过渡到分子间路径。