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Keynote Speaker

Dr. Ki-Hwan Hwang

Department of Chemical Engineering and Biotechnology, University of Cambridge, UK

E-mail

kh826@cam.ac.uk

Nanomechanical Characterization of Organic Molecular Semiconductors via AFM

Ki-Hwan Hwang ^1,2 , Mateo TR Cervantes ^1,2 , and Deepak Venkateshvaran ^1,2,3

¹ Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom

² Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, United Kingdom

³ Department of Science Innovation and Technology, UK Government, 100 Parliament Street, London SW1A 2BQ, United Kingdom

Organic molecular semiconductors (OMSs) have gained significant attention as key materials for next-generation flexible and wearable electronic devices due to their lightweight nature, solution processability, and tunable electronic properties. However, their mechanical stability at the nanoscale remains a critical challenge for practical applications. In this presentation, we introduce a detailed investigation of the nanomechanical properties of various OMS materials using atomic force microscopy (AFM). By employing quasi-static measurement techniques such as PinPoint mode and Quantitative Imaging mode, alongside the dynamic intermodulation AFM method, we quantitatively analyzed the stiffness and Young's modulus of the materials. These complementary approaches enabled precise mechanical characterization under both static and dynamic conditions, effectively revealing subtle differences in mechanical behavior among the OMS samples. This study expands our understanding of the intrinsic mechanical properties of OMSs and provides important insights into the relationships between molecular structure and mechanical performance. Ultimately, the findings offer a solid scientific basis for designing mechanically robust organic semiconductors suitable for real-world device integration.

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