Abstract
Most of all-fused-ring π-conjugated molecules have wide or medium bandgap and show photo response in the visible range. In this work, an all-fused-ring n-type molecule, which exhibits an ultrasmall optical bandgap of 1.22eV and strong near-infrared (NIR) absorption with an onset absorption wavelength of 1013nm is reported. The molecule consists of 14 aromatic rings and has electron donor-acceptor characteristics. It exhibits excellent n-type properties with low-lying HOMO/LUMO energy levels of -5.48eV/-3.95 eV and high electron mobility of 7.0×10-4 cm2 V-1 s-1 . Most importantly, its thin film exhibits a low trap density of 5.55×1016 cm-3 because of the fixed molecular conformation and consequently low conformation disorder. As a result, organic photodetector (OPD) based on the compound exhibits a remarkably low dark current density (Jd ) of 2.01×10-10 Acm-2 at 0V. The device shows a shot-noise-limited specific detectivity (Dsh *) of exceeding 1013 Jones at 400-1000nm wavelength region with a peak specific detectivity of 4.65×1013 Jones at 880nm. This performance is among the best reported for self-powered NIR OPDs.
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