Rubrene crystal field-effect mobility modulation via conducting channel wrinkling

Area of Science:

• Materials Science
• Organic Electronics
• Solid-State Physics

Background:

• Flexible organic electronics are rapidly advancing, necessitating an understanding of mechanical strain's impact on device performance.
• Organic single crystals offer a defect-free platform to systematically study strain effects on electrical properties.

Purpose of the Study:

• To investigate the influence of mechanical deformation on the field-effect mobility of rubrene single crystals.
• To develop a model for quantifying strain and predicting mobility changes in wrinkled organic transistors.

Main Methods:

• Utilizing wrinkling instability to apply controlled local strains to rubrene single-crystal field-effect transistors.
• Employing plate bending theory to model and quantify the net strain at the dielectric/semiconductor interface.

Main Results:

• Field-effect mobility in rubrene single crystals is directly correlated with the net strain at the dielectric/semiconductor interface.
• A predictive model was developed to accurately quantify strain and its effect on mobility.

Conclusions:

• The study establishes a clear structure-function relationship between mechanical strain and electrical performance in organic semiconductors.
• Findings are critical for designing robust and high-performance flexible organic electronic devices.