Abstract
This work presents fully solution-processed, low-voltage C8-Ph-BTBT organic field-effect transistors using cellulose-derived CMC-based layered gate dielectrics. By combining biodegradable CMC with hydrophobic polymer interlayers such as PMMA and PS, the dielectric–semiconductor interface trap density is modulated to improve device stability and electrical performance. The CMC–PS bilayer device shows the most balanced performance, demonstrating a sustainable strategy for low-voltage organic electronics.