Journal
CELL REPORTS PHYSICAL SCIENCE
Volume 2, Issue 3, Pages -Publisher
CELL PRESS
DOI: 10.1016/j.xcrp.2021.100364
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Funding
- National Natural Science Foundation of China [21673082, 21872126]
- Youth Program of the National Natural Science Foundation of China [21903027]
- Natural Science Foundation of Guangdong Province [2019A1515011686, 2019B030301003]
- China Postdoctoral Science Foundation [2018M643064]
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This study synthesized a series of through-space conjugated molecular wires based on HPB, and found that replacing phenyls with thienyls can significantly enhance molecular conductance, demonstrating that strengthening through-space conjugation is an effective approach to achieving high molecular conductance.
Exploring single-molecule wires with high conductance is of significant importance for constructing efficient molecular electronic devices. Contrary to the general method of increasing through-bond conjugation in conventional molecular wires, strengthening through-space conjugation is proposed herein to improve molecular conductance. A series of through-space conjugated molecular wires based on hexaphenylbenzene (HPB) are synthesized, and their crystal and electronic structures, conductance behaviors, and working mechanisms are investigated. The scanning tunneling microscopy-break junction technique discloses that, by replacing phenyls with thienyls in HPB, the molecular conductance is apparently boosted, with up to similar to 239-fold enhancement, and becomes larger than that of the through-bond conjugated control molecule. The flicker noise analyses and theoretical calculation confirm that improved through-space conjugation with thienyls contributes significantly to high conductance. These findings demonstrate that the introduction of strong through-space conjugation is an effective and feasible approach to attain high molecular conductance.
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