About electron transfer over long distances with tunable sub/supersonic velocities

Area of Science:

• Condensed Matter Physics
• Materials Science
• Physical Chemistry

Background:

• Long-range electron transfer is crucial for organic electronics.
• Previous theories struggled to explain observed transport phenomena in crystalline materials.
• Donovan and Wilson reported unusual transient photoconduction in polydiacetylene crystals.

Purpose of the Study:

• To develop a theoretical framework for electron transfer at near-sound velocities in 1D crystal lattices.
• To explain the field-independent transport velocity and ultra-high mobility observed in polydiacetylene.
• To investigate factors influencing charge transport velocity in these systems.

Main Methods:

• Development of a theory incorporating Marcus formulation for electron transfer.
• Application of the theory to analyze transient photoconduction experiments.
• Modeling of electron transport in one-dimensional crystal lattices.

Main Results:

• The theory successfully explains electron transport velocities near sound speed, independent of electric field strength over a wide range.
• It accounts for the ultra-high charge carrier mobility observed at low fields.
• Identified factors that can reduce charge transport velocity.

Conclusions:

• The developed theory provides a robust explanation for high-velocity charge transport in crystalline materials.
• This work offers a deeper understanding of charge dynamics in polydiacetylenes.
• The findings have implications for designing efficient organic electronic devices.