Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan.
Department of Chemical Engineering and Materials Science, Yuan Ze University, Taoyuan, 32003, Taiwan.
Adv Mater. 2017 Sep;29(33). doi: 10.1002/adma.201702217. Epub 2017 Jun 22.
Solution-processable organic-inorganic hybrid perovskite materials with a wealth of exotic semiconducting properties have appeared as the promising front-runners for next-generation electronic devices. Further, regarding its well photoresponsibility, various perovskite-based photosensing devices are prosperously developed in recent years. However, most exploited devices to date only transiently transduce the optical signals into electrical circuits while under illumination, which necessitates using additional converters to further store the output signals for recording the occurrence of light stimulation. Herein, a nonvolatile perovskite-based floating-gate photomemory with a multilevel memory behavior is demonstrated, for which a floating gate comprising a polymer matrix impregnated with perovskite nanoparticles is employed. Owing to the well photoresponsibility introduced by the embedded nanoparticles, the device is enabled to access multiple wavelength response and the functionalities of recording power/time-dependent illumination under no vertical electrical field. Intriguingly, a nonvolatility of photorecording exceeding three months with a high On/Off current ratio over 10 can be achieved.
具有丰富奇异半导体性质的溶液处理型有机-无机杂化钙钛矿材料已经成为下一代电子设备的有前途的领跑者。此外，鉴于其良好的光响应性，近年来各种基于钙钛矿的光电传感设备蓬勃发展。然而，迄今为止，大多数被利用的设备只是在照明下将光学信号短暂地转换为电路，这需要使用额外的转换器来进一步存储输出信号以记录光刺激的发生。在此，展示了一种具有多级存储行为的非易失性基于钙钛矿的浮栅光电存储器，其中采用了包含钙钛矿纳米粒子的聚合物基质作为浮栅。由于嵌入的纳米粒子带来的良好光响应性，该器件能够实现多波长响应以及在没有垂直电场的情况下记录功率/时间相关照明的功能。有趣的是，可实现超过三个月的光记录非易失性，并且开/关电流比超过 10。
