Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea.
Department of Chemistry and Chemical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon, 22212, Republic of Korea.
Adv Mater. 2020 Mar;32(11):e1906899. doi: 10.1002/adma.201906899. Epub 2020 Jan 27.
Photonic synapses combine sensing and processing in a single device, so they are promising candidates to emulate visual perception of a biological retina. However, photonic synapses with wavelength selectivity, which is a key property for visual perception, have not been developed so far. Herein, organic photonic synapses that selectively detect UV rays and process various optical stimuli are presented. The photonic synapses use carbon nitride (C N ) as an UV-responsive floating-gate layer in transistor geometry. C N nanodots dominantly absorb UV light; this trait is the basis of UV selectivity in these photonic synapses. The presented devices consume only 18.06 fJ per synaptic event, which is comparable to the energy consumption of biological synapses. Furthermore, in situ modulation of exposure to UV light is demonstrated by integrating the devices with UV transmittance modulators. These smart systems can be further developed to combine detection and dose-calculation to determine how and when to decrease UV transmittance for preventive health care.
光子突触在单个设备中结合了传感和处理功能，因此它们是模拟生物视网膜视觉感知的有前途的候选者。然而，具有波长选择性的光子突触（这是视觉感知的关键特性）迄今尚未开发出来。本文提出了选择性检测紫外线并处理各种光学刺激的有机光子突触。光子突触使用氮化碳（C N ）作为晶体管几何形状中的 UV 响应浮栅层。C N 纳米点主要吸收紫外线；这一特性是这些光子突触中 UV 选择性的基础。所提出的器件每发生一次突触事件仅消耗 18.06 fJ 的能量，这与生物突触的能量消耗相当。此外，通过将器件与紫外线透射率调制器集成，证明了对紫外线暴露的原位调制。这些智能系统可以进一步开发，以结合检测和剂量计算，以确定如何以及何时降低紫外线透射率以进行预防性保健。
