The quest for high-performance organic thin-film transistor (OTFT) gate dielectrics is of intense current interest. Beyond having excellent insulating properties, such materials must meet other stringent requirements for optimum OTFT function: efficient low-temperature solution fabrication, mechanical flexibility, and compatibility with diverse gate materials and organic semiconductors. The OTFTs should function at low biases to minimize power consumption, hence the dielectric must exhibit large gate capacitance. We report the realization of new spin-coatable, ultrathin (<20 nm) cross-linked polymer blends exhibiting excellent insulating properties (leakage current densities ∼10-8 Acm-2), large capacitances (up to ∼300 nF cm-2), and enabling low-voltage OTFT functions. These dielectrics exhibit good uniformity over areas ∼150 cm2, are insoluble in common solvents, can be patterned using standard microelectronic etching methodologies, and adhere to/are compatible with n+-Si, ITO, and AI gates, and with a wide range of p- and n-type semiconductors. Using these dielectrics, complementary inverters have been fabricated which function at 2V.
ASJC Scopus subject areas
- Colloid and Surface Chemistry