Ferroelectric Photodetector With Programmable Bipolar Photoresponse
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Solution Overview
Problem
Traditional visual processing systems have high energy consumption, time delays, and extra hardware costs due to physically separated sensing, memory, and processing units, and struggle to simulate the bionic function of bipolar cells in the human retina, which is crucial for efficient image processing and real-time decision-making in applications like intelligent industry and automatic driving.
Innovation Solution
A ferroelectric field-modulated positive and negative photo-response detector is developed, comprising a substrate, gate electrodes, a ferroelectric layer, and low-dimensional semiconductors, allowing for the simultaneous generation of programmable positive and negative photoelectric signals through the regulation of ferroelectric fields, enabling high-speed and high-sensitivity photodetection without the need for bias or gate voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional visual processing systems use physically separated sensing, memory and processing units, then each unit can be optimized independently, but the system suffers from high energy consumption, time delay and extra hardware cost
Solution Approach 1:
The patent merges sensing, memory, and processing functions into a single integrated photoelectric device. The ferroelectric field-modulated detector combines photodetection capability with ferroelectric memory functionality, eliminating the need for separate sensing and memory units, thereby reducing energy consumption and hardware complexity while maintaining functional optimization
Solution Approach 2:
The photoelectric device achieves multi-functionality by incorporating both photodetection and ferroelectric memory capabilities in one structure. The device can simultaneously perform light sensing and data storage, reducing the need for multiple specialized components and lowering overall system energy consumption and hardware cost
2Ease of manufacture
If the device structure is simplified to reduce hardware cost, then manufacturing cost decreases, but the ability to simulate bipolar cell functions and achieve high-speed processing is compromised
Solution Approach 1:
The patent combines multiple functional layers (ferroelectric layer, semiconductor layer, electrode structures) into a single integrated device that achieves both cost-effectiveness and high-speed processing. This merger eliminates the need for complex multi-component assemblies while maintaining bipolar cell simulation capability and fast response performance
3Device complexity
If a single photoelectric device is used to simulate both photoreceptor and bipolar cell functions, then device integration increases, but the ability to generate both positive and negative photoelectric signals simultaneously becomes challenging
Solution Approach 1:
The patent employs dynamic control of ferroelectric polarization states to modulate photoelectric signals. By applying external electric fields to switch between different polarization states (upward, downward, or zero), the device can dynamically generate positive, negative, or zero photoelectric responses, enabling simultaneous simulation of both photoreceptor and bipolar cell functions with high adaptability
Solution Approach 2:
The patent changes the ferroelectric polarization parameter (direction and magnitude) to control the sign and magnitude of photoelectric signals. By adjusting the polarization state through external electric fields, the device can continuously modulate between positive and negative responses, achieving versatile signal generation within a single integrated structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves continuous and linear adjustment of photocurrent from positive to negative, enhancing the efficiency of image processing and integration of sensing, storage, and computing, suitable for intelligent vision systems, and supports gray image processing with high sensitivity and stability.
Implementation Method 1
the ferroelectric layer is used to regulate the energy band of the low-dimensional semiconductor through the ferroelectric field
Implementation Method 2
Photoreceptor cells convert the incident light into electric signals
Data Source
AI summary
The present invention relates to a photo-response detector, in particular to a ferroelectric field modulated positive and negative photo-response detector, a preparation method and application thereof. The ferroelectric field modulated positive and negative photo-response detector includes a substrate, a gate electrode, a ferroelectric layer, a low-dimensional semiconductor and a source-drain electrode. A pair of gate electrodes are provided and fixedly arranged on the substrate at intervals. The ferroelectric layer is fixedly arranged on the substrate and completely covers the gate electrode. The low-dimensional semiconductor is fixedly arranged on the ferroelectric layer. The source-drain electrode includes a source electrode and a drain electrode separately arranged on two sides of the low-dimensional semiconductor and fixedly arranged on the ferroelectric layer.