Affiliation:
1. State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China
2. School of Applied Chemistry and Engineering University of Science and Technology of China Hefei 230026 P. R. China
Abstract
AbstractMost 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 1.22 eV and strong near‐infrared (NIR) absorption with an onset absorption wavelength of 1013 nm 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 −5.48 eV/−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 A cm−2 at 0 V. The device shows a shot‐noise‐limited specific detectivity (Dsh*) of exceeding 1013 Jones at 400–1000 nm wavelength region with a peak specific detectivity of 4.65 × 1013 Jones at 880 nm. This performance is among the best reported for self‐powered NIR OPDs.
Funder
National Basic Research Program of China
National Natural Science Foundation of China
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
6 articles.
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