Doping of large ionization potential indenopyrazine polymers via Lewis acid complexation with tris(pentafluorophenyl)borane: a simple method for improving the performance of organic thin-film transistors

摘要: Molecular doping, under certain circumstances, can be used to improve the charge transport in organic semiconductors through introduction of excess carriers which turn negate unwanted trap states often present semiconductors. Here, two Lewis basic indenopyrazine copolymers with large ionization potential (5.78 and 5.82 eV) are prepared investigate p-doping efficiency acid dopant, tris(pentafluorophenyl)borane, using thin-film transistors (OTFTs). The formation acid–base complex between polymer dopant molecules is confirmed via optical spectroscopy electrical field-effect measurements, latter revealing a dopant-concentration-dependent device performance. By adjusting amount p-dopant, hole mobility increased up 11-fold while OTFTs’ threshold voltages reduced. work demonstrates an alternative doping mechanism other than traditional transfer model, where energy level matchin...