Generic dynamic molecular devices by quantitative non-steady-state proton/water-coupled electron transport kinetics

Area of Science:

• Molecular electronics
• Charge transport phenomena
• Non-steady-state kinetics

Background:

• Dynamic molecular devices present challenges for understanding microscopic charge transport.
• Steady-state devices have limitations in achieving certain functionalities.

Purpose of the Study:

• To report a generic dynamic mode for molecular devices.
• To investigate non-steady-state charge transport modulated by proton/water transfer.
• To explore potential applications in neuromorphic computing.

Main Methods:

• Utilizing quinone molecules in a molecular junction.
• Investigating proton/water transfer influencing electron transport.
• Employing theoretical modeling and transient state characterization.
• Using numerical simulation to understand device principles.

Main Results:

• Observed non-steady-state transport characterized by negative differential resistance, dynamic hysteresis, and memory-like behavior.
• Developed a quantitative paradigm for studying non-steady-state charge transport kinetics.
• Demonstrated emulation of neuron synaptic responses (frequency-dependent depression and facilitation) under pulse stimulation.

Conclusions:

• The developed molecular device operates in a dynamic mode governed by slow proton/water transfer and fast electron transport.
• The device exhibits characteristics suitable for future nonlinear and brain-inspired electronic applications.
• Quantitative analysis and simulation provide insights into the fundamental principles of dynamic charge transport.