Opt Lett. 2021 Apr 1;46(7):1748-1751. doi: 10.1364/OL.414820.
In this Letter, we report an optically stimulated synaptic transistor based on / dots mixed-dimensional (MD) heterostructure, where the channel conductance shows a non-linear response to the optical stimuli. Paired-pulse facilitation is realized with the index above 200%, and the optical synaptic plasticity can be modulated by adjusting the amplitude, duration time, frequency, and power of light spikes. In addition, the long-term plasticity shows a gate-tunability, which can be attributed to the unique photoelectric coupling in / dots MD heterostructure. This work opens up a new way to explore optically stimulated synaptic devices based on designed device structure and provides a feasible method to achieve plasticity modulation by gate voltage, which plays an important role in developing neuromorphic devices with complicated functions.
在这封信件中，我们报告了一种基于点混合维度（MD）异质结构的光刺激突触晶体管，其中沟道电导对光刺激表现出非线性响应。通过调整光尖峰的幅度、持续时间、频率和功率，可以实现超过 200%的指数型成对脉冲易化，并且可以通过调整光尖峰的幅度、持续时间、频率和功率来调节光突触的可塑性。此外，长期可塑性具有栅极可调性，这归因于点 MD 异质结构中的独特光电耦合。这项工作为基于设计的器件结构探索光刺激突触器件开辟了新途径，并提供了通过栅极电压实现可塑性调制的可行方法，这对开发具有复杂功能的神经形态器件具有重要意义。
