Efficient calculation of electronic coupling integrals with the dimer projection method via a density matrix...

Area of Science:

• Computational Chemistry
• Materials Science
• Organic Electronics

Background:

• Understanding charge transfer is crucial for designing organic semiconductors used in solar cells, transistors, and LEDs.
• Semiempirical quantum mechanical (SQM) methods offer an efficient route to explore electron transfer mechanisms.

Purpose of the Study:

• To evaluate the performance of the dimer projection (DIPRO) method combined with the non-self-consistent density matrix tight-binding potential (PTB) for calculating charge transfer integrals.
• To assess the accuracy and efficiency of the DIPRO@PTB method for large hetero-organic systems.

Main Methods:

• Utilized the DIPRO method with the PTB potential, parameterized for elements up to Z = 86.
• Incorporated approximate non-local exchange within the PTB potential for enhanced accuracy.
• Benchmarked results against established databases (HAB, JAB69) and high-level ωB97X-D4 calculations.

Main Results:

• DIPRO@PTB demonstrated consistent, good performance among tested SQM approaches for calculating coupling integrals.
• The method provides reasonably accurate results at a low computational cost.
• The approach is suitable for screening and application to large systems like metal-organic frameworks and molecular aggregates.

Conclusions:

• DIPRO@PTB is a reliable and efficient computational tool for investigating charge transport in organic materials.
• This method facilitates the design of advanced organic electronic devices by providing accurate charge transfer parameters.