Nanostructured Honeycomb Film Architectures for Stretchable Opto-electronics

In this presentation we report the fabrication of semiconducting and insulating nanostructured honeycomb films using the breath figure method technique and their use for demonstrating highly stretchable opto-electronic devices. This technique consists of spin-coating a polymer solution in a high relative humidity (>90%) atmosphere resulting in formation of cavities within the polymer film with controlled distribution, height and size. Thus, semiconductor films can be integrated into organic thin-film transistors for gas detection and organic electrochemical transistors for bio-electronic applications. Particularly, we demonstrate electrochemical transistors with excellent performance and strain-insensitive current-voltage characteristics up to ~ 90% strain and laminable on the skin and plants. Finally, we report the use of insulating polymers for fabricating stretchable photovoltaic devices.