Jiang Ting, Wang Yiru, Huang Wanxin, Ling Haifeng, Tian Guofeng, Deng Yunfeng, Geng Yanhou, Ji Deyang, Hu Wenping
Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, Institute of Molecular Aggregation Science, Tianjin University, 300072, Tianjin, China.
Haihe Laboratory of Sustainable Chemical Transformations, 300192, Tianjin, China.
Light Sci Appl. 2023 Nov 7;12(1):264. doi: 10.1038/s41377-023-01310-3.
The neuromorphic vision sensor (NeuVS), which is based on organic field-effect transistors (OFETs), uses polar functional groups (PFGs) in polymer dielectrics as interfacial units to control charge carriers. However, the mechanism of modulating charge transport on basis of PFGs in devices is unclear. Here, the carboxyl group is introduced into polymer dielectrics in this study, and it can induce the charge transfer process at the semiconductor/dielectric interfaces for effective carrier transport, giving rise to the best device mobility up to 20 cm V s at a low operating voltage of -1 V. Furthermore, the polarity modulation effect could further increase the optical figures of merit in NeuVS devices by at least an order of magnitude more than the devices using carboxyl group-free polymer dielectrics. Additionally, devices containing carboxyl groups improved image sensing for light information decoding with 52 grayscale signals and memory capabilities at an incredibly low power consumption of 1.25 fJ/spike. Our findings provide insight into the production of high-performance polymer dielectrics for NeuVS devices.
基于有机场效应晶体管（OFET）的神经形态视觉传感器（NeuVS），采用聚合物电介质中的极性官能团（PFG）作为界面单元来控制电荷载流子。然而，在器件中基于PFG调制电荷传输的机制尚不清楚。在本研究中，将羧基引入聚合物电介质，其可在半导体/电介质界面处诱导电荷转移过程以实现有效的载流子传输，在 -1 V的低工作电压下产生高达20 cm² V⁻¹ s⁻¹ 的最佳器件迁移率。此外，极性调制效应可使NeuVS器件中的光学品质因数比使用无羧基聚合物电介质的器件进一步提高至少一个数量级。此外，含羧基的器件以1.25 fJ/尖峰的极低功耗改善了用于光信息解码的具有52个灰度信号的图像传感和存储能力。我们的研究结果为NeuVS器件高性能聚合物电介质的生产提供了见解。
