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.

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