An n-Type All-Fused-Ring Molecule with Photoresponse to 1000 nm for Highly Sensitive Near-Infrared Photodetector

Yingze Zhang; Yingjian Yu; Xinyu LiuJunhui MiaoYanchun HanJun LiuLixiang Wang

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An n-Type All-Fused-Ring Molecule with Photoresponse to 1000 nm for Highly Sensitive Near-Infrared Photodetector

机译：An n-Type All-Fused-Ring Molecule with Photoresponse to 1000 nm for Highly Sensitive Near-Infrared Photodetector

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Most of all-fused-ring π-conjugated molecules have wide or medium bandgapand show photo response in the visible range. In this work, an all-fused-ringn-type molecule, which exhibits an ultrasmall optical bandgap of 1.22 eVand strong near-infrared (NIR) absorption with an onset absorption wavelengthof 1013 nm is reported. The molecule consists of 14 aromatic ringsand has electron donor–acceptor characteristics. It exhibits excellent n-typeproperties with low-lying HOMO/LUMO energy levels of ?5.48 eV/?3.95eV and high electron mobility of 7.0 × 10~(?4) cm~2 V~(?1) s~(?1). Most importantly,its thin film exhibits a low trap density of 5.55 × 10~(16) cm?3 because of thefixed molecular conformation and consequently low conformation disorder.As a result, organic photodetector (OPD) based on the compound exhibitsa remarkably low dark current density (J_d) of 2.01 × 10~(?10) A cm~(?2) at 0 V. Thedevice shows a shot-noise-limited specific detectivity (D_(sh)*) of exceeding10~(13) Jones at 400–1000 nm wavelength region with a peak specific detectivityof 4.65 × 10~(13) Jones at 880 nm. This performance is among the best reportedfor self-powered NIR OPDs.

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来源
《Advanced Materials》 |2023年第20期|2211714.1-2211714.11|共11页
作者
Yingze Zhang; Yingjian Yu; Xinyu LiuJunhui MiaoYanchun HanJun LiuLixiang Wang;
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作者单位

State Key Laboratory of Polymer Physics and ChemistryChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022, P. R. China, School of Applied Chemistry and EngineeringUniversity of Science and Technology of ChinaHefei 230026, P.;

State Key Laboratory of Polymer Physics and ChemistryChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022, P. R. China;

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all-fused-ring molecules; low trap density; near-infrared absorption; organic photodetectors;

An n-Type All-Fused-Ring Molecule with Photoresponse to 1000 nm for Highly Sensitive Near-Infrared Photodetector

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