An n-Type All-Fused-Ring Molecule with Photoresponse to 1000 nm for Highly Sensitive Near-Infrared Photodetector
© 2023 Wiley-VCH GmbH.
| Veröffentlicht in: | Advanced materials (Deerfield Beach, Fla.). - 1998. - 35(2023), 20 vom: 27. Mai, Seite e2211714 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2023
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| Zugriff auf das übergeordnete Werk: | Advanced materials (Deerfield Beach, Fla.) |
| Schlagworte: | Journal Article all-fused-ring molecules low trap density near-infrared absorption organic photodetectors |
| Zusammenfassung: | © 2023 Wiley-VCH GmbH. 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 1.22 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 |
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| Beschreibung: | Date Completed 18.05.2023 Date Revised 18.05.2023 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1521-4095 |
| DOI: | 10.1002/adma.202211714 |