The growing demands of artificial intelligence, smart robotics, and human prosthetics urge for visual systems, pressure/mechano, and thermo/temperature sensors identical to biological sensory receptors. Among these purposes, artificial visual systems are indispensable for night surveillance and medical imaging applications. For artificial visual system, photodetectors with organic semiconductors are very attractive due to the unique properties of band-gap designing, solution processable, intrinsic flexible and light weight, as well as low cost. we integrate three different organic semiconductors into one pixel cell for ultrathin and high sensitive detectors. The magnification effect of organic transistors enhances ratio of light/dark current from 104 to 108. Recently, we integrate a memory transistor in similar system. Featuring an integration of photosensing and floating-gate memory modules, the device possesses an acute color distinguishing capability. In general, the retina-like photosensor transduces NIR (850 nm) into nonvolatile memory and acts as a dynamic photoswitch under green light (550 nm). In doing this, a filter-free but color-distinguishing photosensor is demonstrated that selectively converts NIR optical signals into nonvolatile memory.

Flexible photodetectors based on organic semiconductors

256th National Meeting (2018)

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