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Structure‐Independent Conductance of Thiophene‐Based Single‐Stacking Junctions
Author(s) -
Li Xiaohui,
Wu Qingqing,
Bai Jie,
Hou Songjun,
Jiang Wenlin,
Tang Chun,
Song Hang,
Huang Xiaojuan,
Zheng Jueting,
Yang Yang,
Liu Junyang,
Hu Yong,
Shi Jia,
Liu Zitong,
Lambert Colin J.,
Zhang Deqing,
Hong Wenjing
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201913344
Subject(s) - stacking , intermolecular force , intramolecular force , conductance , molecule , chemical physics , thiophene , charge (physics) , chemistry , materials science , crystallography , computational chemistry , stereochemistry , condensed matter physics , physics , organic chemistry , quantum mechanics
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.