Optical synaptic device based on amorphous silicon film, preparation method and working method

Abstract

The invention provides an optical synaptic device and method based on an amorphous silicon film. According to the device, optical signals with different energies are used as excitation sources, optical signals with different energies are used for simulating the action potential of a synaptic front end, photo-generated carriers are selectively excited in the amorphous silicon thin film, photocurrent change is caused by capturing and releasing photon-generated carriers by utilizing defect energy levels in the amorphous silicon thin film, the post-synaptic current is simulated by the photocurrentresponse of the device, identification of different colors, namely energy, is realized, therefore, the bionic synaptic function with color selective recognition capability is realized, the change ofphotocurrent response generated by capture and release of photon-generated carriers by defect energy levels represented by a suspension spline in the amorphous silicon thin film is ingeniously utilized, and the synapse function of the device is achieved. The device is advantaged in that the photoelectric synapse provided by the invention not only has the characteristics of simple device structureand preparation process, compatibility with a Si-CMOS process and the like, but further has color recognition capability, and can solve a problem that the working bandwidth of an electric excitation electric reading synapse device is limited.

Description

technical field [0001] The invention belongs to the field of silicon-based photonic integrated devices and neuromorphic chips, and in particular relates to an optical synapse device based on an amorphous silicon film, a preparation method and a working method thereof. Background technique [0002] With the vigorous development of emerging fields such as artificial intelligence, the Internet of Things, and "big data", computers based on Vonno-Iman's architecture are facing severe challenges in terms of size, data processing capabilities, and energy consumption. In order to meet this challenge, the researchers proposed a new type of computer architecture, which uses neuromorphic chips to break through the bottleneck faced by the von Neumann architecture. Neuromorphic chips, also commonly referred to as "brain-like chips," consist of "neurons" and "synapses" that connect two different neurons. In the neuromorphic chip, the synaptic unit can realize the integrated function of c...

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Problems solved by technology

[0003] Most of the existing patents are synapses with electrical signals as the excitation source (called electrical synapses). This type of synapse device only uses electrical signals as the excitation signal of synapses to realize the function of artificial synapses. Its operating bandwidth is greatly limited

At present, only a few published patents use light as an artificial synapse as an excitation signal (publication numbers: CN109659436A, CN109460819A). This type of optical synapse can respond to light sources of different wavelengths, but cannot distinguish the wavelength of excitation light

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