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A super low band-gap IR dye realized 360° omnibearing and all optical wavelength photo-detection

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ABSTRACT Common photo-detectors can easily detect the front light source, but it has no response for the rear incident light. If the light source comes from back, to obtain the… Click to show full abstract

ABSTRACT Common photo-detectors can easily detect the front light source, but it has no response for the rear incident light. If the light source comes from back, to obtain the photo-electric signal, the detector has to turn certain angles to track the light source and this will inevitably cost more time or need complicated mechanical system. Here, a solution-processed photo-detector is reported what is based on a new low band-gap all fused infrared (IR) dyes: N-hybridized hexarylenetetracarboxylic bisimides (NHAB). The detector has 360° omnibearing and a wide photo-electric response spectral range from 300 to 1200 nm. Operating at room temperature and zero bias, the device detectivity at 405 nm is 1.65 × 1012 Jones and a maximum responsivity 189 mA/W at twelve o'clock direction, a moderate responsivity 34 mA/W at six o'clock direction.

Keywords: low band; 360 omnibearing; photo; band gap

Journal Title: Dyes and Pigments
Year Published: 2021

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