Ferroelectric Heterojunction Structure for In-Sensor Optical Memory
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Solution Overview
Problem
Existing digital image sensors and cameras face challenges in detecting a wide wavelength range, consuming excessive power, and being too large for practical application, while also failing to meet the demands of low power consumption and high response in the context of future Internet of Things (IoT) and artificial intelligence systems.
Innovation Solution
A heterojunction structure device is proposed, featuring a gate electrode, a ferroelectric layer made of hafnium zirconium oxide (HZO), and a channel layer composed of alpha-indium selenide (α-In2Se3), with an insulating layer of aluminum oxide (Al2O3) in between. This device allows for control of polarization in the channel layer via light irradiation and in the ferroelectric layer via gate voltage, enabling all-in-one optical signal sensing, processing, and memory within a single device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional CMOS image sensors or CCD cameras are used, then optical signal detection capability is achieved, but the device size becomes large and power consumption increases
Solution Approach 1:
The patent merges the photo sensor, signal processing apparatus, and electronic memristor into a single integrated device structure. The photodetector directly connects to the memristor array, eliminating the need for separate processing modules and reducing overall device size while maintaining detection capability.
Solution Approach 2:
The memristor array serves multiple functions simultaneously: it acts as both the signal processing unit and the memory storage unit. This multi-functionality reduces the number of required components and simplifies the overall device architecture, addressing the size constraint.
2Measurement precision
If conventional digital image sensors are used, then image capture function is achieved, but power consumption becomes excessive
Solution Approach 1:
The memristor array performs signal processing and memory storage functions in-situ, without requiring external processing units. This self-service capability reduces the power consumption associated with data transmission and processing between separate components.
Solution Approach 2:
The device is segmented into functional regions (photodetector array, memristor array, and interconnect structures) that operate semi-independently. This segmentation allows for optimized power management where only active regions consume significant power, reducing overall power consumption.
3Productivity
If separate memory and processing apparatuses are used, then data processing capability is achieved, but response time increases and power consumption rises
Solution Approach 1:
The processing apparatus and memory are merged into a single integrated structure where the memristor array serves both functions. This eliminates the time delay associated with data transmission between separate components and reduces the overall response time of the system.
4Measurement precision
If conventional image sensor architecture is used, then basic detection is achieved, but adaptability to different applications is limited
Solution Approach 1:
The integrated device structure with memristor-based processing and storage can be configured for different applications (image sensing, artificial intelligence tasks, low-power computing) by programming the memristor array, providing high adaptability without sacrificing detection accuracy.
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 heterojunction structure device achieves efficient detection and processing of optical signals across a wide wavelength range, including weak light intensities, while reducing power consumption and device size, making it suitable for applications in artificial visual systems, solar cells, gas sensors, and piezoelectric devices.
Implementation Method 1
a ferroelectric layer disposed on the gate electrode and including hafnium zirconium oxide (HZO)... control of polarization in the ferroelectric layer via gate voltage
Implementation Method 2
a channel layer composed of alpha-indium selenide (α-In2Se3)... control of polarization in the channel layer via light irradiation, enabling all-in-one optical signal sensing
Implementation Method 3
making it suitable for applications in artificial visual systems, solar cells, gas sensors, and piezoelectric devices
Data Source
AI summary
Provided is a heterojunction structure device. The heterojunction structure device includes: a gate electrode disposed on a substrate; a ferroelectric layer disposed on the gate electrode and including a material having ferroelectric characteristics; a channel layer disposed on the ferroelectric layer and including a material having ferroelectric and semiconductor characteristics; and a source electrode and a drain electrode disposed on the channel layer while being spaced apart from each other.