Transparent Nonvolatile Memory Cell Using Organic Ferroelectric Layer
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Solution Overview
Problem
Current transparent electronics face challenges in developing nonvolatile memory devices that are transparent, flexible, and reliable, with issues in material compatibility, operational reproducibility, and environmental tolerance, particularly in achieving stable data storage and low operating voltages for integrated memory transistors.
Innovation Solution
A transparent nonvolatile memory cell is designed with a memory transistor and a driver transistor integrated on the same substrate, utilizing an organic ferroelectric layer for the memory transistor and a gate insulating layer for the driver transistor, along with a buffer layer to enhance stability and reduce leakage currents, allowing for efficient data storage and operation within a low voltage range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an oxide layer with large energy bandgap is used to achieve transparency and nonvolatile memory function, then data storage capability is improved, but operating voltage becomes excessively high making system integration difficult
Solution Approach 1:
The patent changes the material parameter from conventional oxide semiconductors to organic semiconductors, which have different electrical characteristics that enable nonvolatile memory operation at lower voltages while maintaining transparency and data storage capability
Solution Approach 2:
The patent uses a composite structure combining organic semiconductor layers with specific electrode materials and insulating layers to achieve both low operating voltage and reliable data storage in a transparent device
2Ease of manufacture
If memory device is mounted outside the system, then transparency requirement is simplified, but power consumption increases and mounting cost increases
Solution Approach 1:
The patent integrates the memory device with the display system on the same substrate, combining previously separate functions into a unified structure that reduces power consumption and eliminates external mounting requirements while maintaining transparency
3Loss of information
If conventional oxide-based nonvolatile memory is used, then data retention is improved, but device stability and cycling characteristic under repeated write operations deteriorates
Solution Approach 1:
The patent changes the semiconductor material from oxide-based to organic-based, fundamentally altering the electrical and chemical properties to achieve both good data retention and improved cycling characteristics under repeated write operations
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 solution enables the creation of a transparent nonvolatile memory cell with improved stability, data retention, and reduced operating voltage, addressing the limitations of existing technologies by integrating memory and driver transistors on a single substrate with optimized material layers, thus enhancing the reliability and functionality of transparent electronics.
Implementation Method 1
utilizing an organic ferroelectric layer for the memory transistor
Data Source
AI summary
Provided are a nonvolatile memory cell and a method of manufacturing the same. The nonvolatile memory cell includes a memory transistor and a driver transistor. The memory transistor includes a semiconductor layer, a buffer layer, an organic ferroelectric layer, and a gate electrode, which are disposed on a substrate. The driver transistor includes the semiconductor layer, the buffer layer, a gate insulating layer, and the gate electrode, which are disposed on the substrate. The memory transistor and the driver transistor are disposed on the same substrate. The nonvolatile memory cell is transparent in a visible light region.