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Supramolecular Transistors with Quantum Interference Effect.

Xiaohui Li1, Yan Zheng1, Yu Zhou1

  • 1State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & College of Materials & IKKEM, Xiamen University, Xiamen, 361005, China.

Journal of the American Chemical Society
|September 25, 2023
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Summary
This summary is machine-generated.

Researchers developed supramolecular transistors using π-stacked co-oligomers. They controlled quantum interference (QI) effects in these molecular channels, achieving high on/off ratios for advanced molecular electronics.

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Area of Science:

  • Molecular electronics
  • Supramolecular chemistry
  • Quantum interference phenomena

Background:

  • Charge transport in supramolecular junctions is influenced by quantum interference (QI) effects.
  • Controlling supramolecular assembly configuration is crucial for harnessing QI features in devices.
  • Supramolecular transistors offer potential for novel electronic functionalities.

Purpose of the Study:

  • To fabricate and investigate charge transport in individual π-stacked thiophene/phenylene co-oligomers (TPCOs) as supramolecular channels.
  • To demonstrate the configuration control of QI features in supramolecular assemblies.
  • To characterize the performance of fabricated supramolecular transistors.

Main Methods:

  • Fabrication of supramolecular transistors using individual π-stacked TPCOs.
  • Electrochemical gating scanning tunneling microscope break junction technique for charge transport investigation.
  • Density functional theory (DFT) calculations to understand QI variations.

Main Results:

  • Achieved supramolecular transistors with an on/off ratio >10³ (∼1300).
  • Observed high gating efficiency (∼165 mV/dec) and low off-state leakage current (∼30 pA).
  • Demonstrated control over QI states (anti-resonance and resonance) by tuning supramolecular configurations, with channel lengths <2.0 nm.

Conclusions:

  • Supramolecular channels exhibit tunable QI features dependent on architecture and configuration.
  • Fine-tuning supramolecular configurations efficiently manipulates QI effects.
  • This work highlights the potential of supramolecular channels for molecular electronics and advances understanding of intermolecular charge transport.