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Ionic landscapes in single-molecule electronics: shaping charge transport beyond energy level realignment.
Xinyan Mai1,2, Ziyi Ju2,3, Jingying Zhao1,2
1Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China.
Chemical Society Reviews
|May 19, 2025
Summary
Ions significantly impact single-molecule charge transport in molecular electronics, influencing tunneling barriers, molecular structure, and electrode interactions. Understanding these ionic effects is key for advancing nanoscale electronic devices.
Area of Science:
- Molecular Electronics
- Nanoscale Science
- Physical Chemistry
Background:
- Single-molecule charge transport is crucial for molecular electronics.
- Ionic environments traditionally influence charge transport via electrochemical gating.
- A deeper understanding of ion-molecule interactions is needed.
Purpose of the Study:
- To review the multifaceted influence of ions on single-molecule charge transport.
- To explore how ionic environments modulate various aspects of charge transport.
- To integrate theoretical and experimental frameworks for ionic control.
Main Methods:
- Review of classical and innovative experimental approaches.
- Analysis of ion-induced modulation of tunneling barriers, conformations, and coupling.
- Evaluation of solvent-ion interactions, pH, and counterion effects.
Main Results:
- Ions dynamically shape molecular electronics by altering tunneling barrier shapes, molecular conformations, electrode work functions, and molecule-electrode coupling.
- Solvent-ion interactions, pH, and counterions play critical roles.
- Experimental and theoretical frameworks are being integrated for precise ionic control.
Conclusions:
- Ionic environments are a critical, often overlooked, factor in molecular electronics.
- Precise ionic control offers new design principles for electrolytes and device configurations.
- Understanding ionic effects is vital for advancing fundamental insights and practical applications in molecular electronics.
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