This book consists of six chapters: In the first chapter, electrical and material properties and charge transport in organic and graphene based FETs are introduced. In the second chapter, device architectures of amorphous copolymer FETs are discussed. The combination of recessed electrodes and surface treatments on electrical contact is investigated. In the third chapter, device physics and charge transport of donor-acceptor copolymer based FETs are discussed. Charge transport measurements in steady-state and under non-quasi-static conditions reveal device physics in dual-gate configuration....