Variable Range Hopping Model Based on Gaussian Disordered Organic Semiconductor for Seebeck Effect in Thermoelectric...

Area of Science:

• Materials Science
• Condensed Matter Physics
• Organic Electronics

Background:

• Organic semiconductors are promising for thermoelectric devices.
• Understanding charge transport and the Seebeck effect in these materials is crucial for performance optimization.
• Existing models struggle to accurately describe the Seebeck coefficient's dependence on carrier concentration and temperature in disordered systems.

Purpose of the Study:

• To develop a general model for the Seebeck effect in Gaussian disordered organic semiconductors (GD-OSs).
• To accurately predict thermoelectric properties based on carrier concentration and temperature.
• To provide insights into charge transport and guide the optimization of organic thermoelectric devices.

Main Methods:

• Development of a general model based on variable-range hopping (VRH) theory.
• Analysis of carrier concentration and temperature dependence of the Seebeck coefficient.
• Comparison with conventional Mott's VRH and mobility edge models.

Main Results:

• The proposed VRH-based model successfully interprets experimental data for various organic field-effect transistors (FETs).
• The model demonstrates a superior description of the Seebeck coefficient-conductivity relationship compared to existing theories.
• The study reveals key insights into charge transport mechanisms in GD-OSs.

Conclusions:

• The developed model offers a more accurate understanding of thermoelectric properties in disordered organic semiconductors.
• This work provides a framework for optimizing the performance of organic thermoelectric devices.
• The findings contribute to the fundamental knowledge of charge transport in organic electronic materials.