A low temperature crosslinking benzocyclobutene based polymer dielectric for organic thin film transistors on plastic substrates

The synthesis of a new benzocyclobutene based polymer, PSBBB, as dielectric material for organic thin film transistors was reported. Compared to conventional benzocyclobutene based materials, the introduction of a butoxide substituent at the 7-position of the benzocyclobutene subunit allowed PSBBB to be crosslinked at temperatures of 120 °C, thus rendering it compatible with the processing conditions incurred by flexible plastic substrates. The crosslinking behavior of PSBBB was investigated by Fourier transform-infrared spectroscopy and differential scanning calorimetry, demonstrating crosslinking of the polymer after curing at 120 °C. Bottom-gate bottom-contact organic thin film transistors were fabricated using PSBBB as dielectric, affording a comparable performance to other dielectric polymeric materials.