High K nanocomposite dielectric for printed organic electronics applications

Solution processed, high K nanocomposite dielectric material was demonstrated as a low cost insulating material for printed organic electronics applications. A nanocomposite dielectric consisting of an epoxy solution with propylene glycol methyl ether acetate (PGMEA) as the solvent and barium titanate (BTO) nanoparticles was developed and utilized as a printed dielectric. The high relative permittivity (K = 35), bimodal nanocomposite system utilized has two different filler particle sizes 200 and 1000 nm diameter particles. Due to the nanosize of the BTO particles, they disperse well in the organic matrix, which makes it possible to use low cost solution-processable methods, such as pad printing. In this paper we present our work to develop an characterize a low cost pad printed bimodal nanocomposite dielectric with a high capacitance density of about 62 pF/mm(2) with low dielectric loss (approximately 3%) and quite low current leakage. (C) 2012 Published by Elsevier B.V.