Ultra-Sensitive and Low-Power-Consumption Organic Phototransistor Enables Nighttime Illumination Perception for Bionic Mesopic Vision

作者：Deng, Wei; Lv, You; Ruan, Xiaobin; Zhang, Xiujuan^*; Jia, Ruofei; Yu, Yongqiang; Liu, Zeke; Wu, Di; Zhang, Xiaohong; Jie, Jiansheng^*

来源：Laser & Photonics Reviews, 2022, 16(9): 2200283.

DOI：10.1002/lpor.202200283

• bionic mesopic vision
• low power consumption
• nighttime illumination perception
• organic phototransistors
• ultrahigh sensitivity of organic phtotransistors

Emulating human vision using solid-state devices is critical in the fields of robotics, artificial intelligence, and visual prostheses, driving intense research interest. However, bionic vision devices made from routine structures suffer from low light-perception sensitivity to nighttime low illuminations and high power consumption, impeding their applications in many advanced scenarios from nighttime autopilot to night vision neuroprosthesis. Here, an ultrasensitive and low-power-consumption organic phototransistor that consists of a unique Schottky-barrier structure and separated light absorption and carrier transport layers is reported. This device design shuns the introduction of trap states into the carrier transport route, which guarantees an ultra-steep subthreshold swing and thus significantly amplifies the photocurrent while lowering operation voltage. In consequence, the weak-light detection capacity for this device is enhanced dramatically, which can perceive nighttime low light illuminations with ultrahigh light-perception sensitivity of 10(2)-10(4) and low power consumption of <10 nW. Leveraging these findings, it is demonstrated that the phototransistor has neuromorphic vision perception behaviors and energy efficiency like human brain under faint light, opening a new opportunity for artificial vision.

• 单位
  苏州大学; 郑州大学