Abstract
Proteins such as silk fibroin, gelatin and bovine serum albumin were reported to be excellent gate dielectrics for pentacene OTFTs. The purpose of this research is to clarify the role of amino acids, which made up of protein. By the chemical method called “Ring-opening polymerization of N-carboxy anhydride” (NCA ROP), polypeptides were synthesized as gate dielectric materials for OTFTs. All the OTFTs exhibit transistor characteristics. In this study, we synthesize Serine and Alanine into homopolypeptides and random copolypeptides of different ratio. These peptides were spin-casted as dielectrics for pentacene thin film transistors. The results show that, hysteresis is influenced by changing the ratio of amino acids, and the electrical characteristics are altered by the temperature treatment on dielectric thin films. For the device that contains 20% Serine units under 80℃ treatment, a field effect mobility value of 0.87 cm2V-1s-1 and a threshold voltage of -0.67 V are achieved.