Reactive Dedoping Method for Performance Enhancement of Self-Powered Polymeric Schottky Diode
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A simple and strategic junction tailoring technology is reported to enhance self-powered polymeric Schottky photodiode performances by synergetic contributions of reactive dedoping effects. It is shown that dedoping poly(3-hexylthiophene-2,5-diyl) (P3HT) films with 1-propylamine (PA) solution meaningfully lowers not only defect-acceptor density but also intrinsic doping level, resulting in significantly enlarged depletion width of metal-polymer Schottky junctions. Also, it is shown that non-solvent effects of PA-dedoping process further make paracrystalline disorder lower and, thus, charge carrier mobility higher. As a result of such synergetic virtues of the PA-dedoping method, self-powered green-selective polymeric photodiodes are reported with a high specific detectivity over 6×1012 Jones and low noise-equivalent power of 5.05×10-14 W Hz-0.5.