Two-dimensional bimolecular recombination in amorphous organic semiconductors

Area of Science:

• Materials Science
• Organic Electronics
• Semiconductor Physics

Background:

• Amorphous organic semiconductors with lamellar structures are key in organic electronics.
• Understanding charge carrier recombination is crucial for device performance.
• Energetic disorder in organic semiconductors significantly influences charge transport and recombination.

Purpose of the Study:

• To investigate the two-dimensional bimolecular recombination of charge carriers in lamellar amorphous organic semiconductors.
• To calculate the effective recombination rate constant's dependence on carrier density.
• To account for the correlated nature of energetic disorder in these materials.

Main Methods:

• Theoretical modeling of charge carrier recombination.
• Calculation of the effective recombination rate constant.
• Analysis of the dependence on carrier density and disorder correlation.

Main Results:

• The effective recombination rate constant is dependent on carrier density.
• Correlated energetic disorder significantly affects recombination kinetics.
• A rich variety of recombination behaviors are observed.

Conclusions:

• The correlated nature of energetic disorder is a critical factor in bimolecular recombination.
• Recombination kinetics in these materials are highly tunable by disorder properties.
• This work provides insights into charge carrier dynamics in amorphous organic semiconductors.