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This lecture covers the fundamentals of organic electronic materials, focusing on organic field-effect transistors (OFETs). Topics include charge transport in organic materials, intramolecular electron delocalization, organic semiconductor materials, and organic electronic devices. The instructor explains the operation and characterization of OFETs, discussing the response in linear and transition regimes, as well as device geometries, fabrication methods, and real device examples. Key parameters from transfer curves are highlighted, along with device characterization setups. Examples of OFET research, such as Rubrene single crystal devices, are presented. The lecture concludes with the discussion of OTFT-based flexible devices, showcasing the advancements in organic electronics.