Exploring coherent transport through π-stacked systems for molecular electronic devices

Area of Science:

• Materials Science
• Condensed Matter Physics
• Physical Chemistry

Background:

• Electron transport across π-stacked systems is crucial for understanding intermolecular tunneling in molecular junctions.
• This knowledge can guide the design of high-efficiency molecular electronic and thermoelectric devices.

Purpose of the Study:

• To investigate how conjugation length and substituent groups affect electron transport and thermoelectric response in π-stacked molecular junctions.
• To identify promising molecular structures for advanced thermoelectric applications.

Main Methods:

• Computational investigation of five representative stacked molecular junctions.
• Analysis of electron transport properties, including thermopower and power factor.
• Evaluation of structural influences on electronic and thermoelectric performance.

Main Results:

• A π-stacked system of substituted anthracenes demonstrated good thermopower and a high power factor, indicating enhanced thermoelectric response with increased conjugation.
• The fully eclipsed structure of quinhydrone showed a high power factor at its minimum energy configuration.

Conclusions:

• Increased conjugation length positively influences the thermoelectric response in π-stacked systems.
• Quinhydrone's eclipsed structure presents a strong candidate for thermoelectric device applications due to its high power factor.