Design Rules to Maximize Charge-Carrier Mobility along Conjugated Polymer Chains

Area of Science:

• Materials Science
• Condensed Matter Physics
• Computational Chemistry

Background:

• Polymeric materials with high charge-carrier mobility often exhibit poor structural order.
• Understanding structure-property relationships is crucial for designing advanced conjugated polymer architectures.

Purpose of the Study:

• To investigate intrachain charge transport mechanisms in conjugated polymers.
• To elucidate the role of conformational effects on charge-carrier mobility.
• To compare charge transport in polymers with molecular crystals.

Main Methods:

• Utilized a surface hopping algorithm for intrachain charge transport simulations.
• Employed a phenomenological Hamiltonian parameterized against first-principles simulations.
• Analyzed temperature-dependent charge-carrier mobility and its relation to electronic bandwidth and electron-phonon interactions.

Main Results:

• Conformational effects significantly impact temperature-dependent charge-carrier mobility in polymers.
• Simulation results align with recent experimental observations.
• Demonstrated that intrachain charge-carrier mobility can exceed 100 cm²/Vs through chemical engineering.

Conclusions:

• Intrachain charge transport is a dominant factor in polymer electronics.
• Chemical modification of polymer backbones offers a route to high-performance organic electronic materials.
• The study provides a framework for rational design of conjugated polymers for specific electronic applications.