Ferroelectric Oxide Semiconductor Stack With Shared Electrode Layout
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Solution Overview
Problem
Current semiconductor devices face challenges in achieving high integration and low-power driving due to the need for separate terminals between ferroelectric and semiconductor layers, limiting their compactness and operational efficiency.
Innovation Solution
A semiconductor device configuration that includes a ferroelectric layer, a conductive metal oxide layer, and a semiconductor layer between two electrodes, where the conductive metal oxide layer controls the crystal direction of the ferroelectric layer without preventing electric current flow, and the ferroelectric layer controls polarization direction to form depletion or accumulation regions in the semiconductor layer, enabling variable resistance and efficient information storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If separate terminals are used between ferroelectric and semiconductor layers, then device functionality is maintained, but device complexity and area increase
Solution Approach 1:
The patent merges the terminal structure by making the second electrode common to both the ferroelectric layer and the semiconductor layer. This eliminates the need for separate terminals, reducing device complexity and area while maintaining proper electrical connections and functionality through the shared electrode architecture.
Solution Approach 2:
The second electrode serves multiple functions simultaneously: it acts as the bottom electrode for the ferroelectric layer and the top electrode for the semiconductor layer. This multi-functional design reduces the total number of terminals required while ensuring both components operate correctly with appropriate electrical connections.
2Productivity
If device size is reduced for high integration, then integration density increases, but manufacturing precision requirements increase
Solution Approach 1:
By merging the terminal structures and using a shared second electrode, the patent reduces the overall device footprint. This compact design increases integration density while the simplified structure actually reduces alignment complexity compared to separate terminal configurations, as fewer layers require precise stacking.
3Reliability
If conductive metal oxide layer is added to control crystal direction, then ferroelectric layer performance improves, but device complexity increases
Solution Approach 1:
The conductive metal oxide layer serves as an intermediary between the ferroelectric layer and the electrode, mediating the crystal orientation through epitaxial growth. This thin intermediate layer enables precise control of ferroelectric crystal direction without requiring complex structural modifications, as it simply provides the necessary lattice template for oriented growth.
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
This configuration allows for increased integration, low-power driving, and improved compactness of semiconductor devices by eliminating the need for separate terminals between the ferroelectric and semiconductor layers, enhancing operational efficiency and miniaturization.
Implementation Method 1
The semiconductor device may be configured to control a polarization direction of a polarization of the ferroelectric layer according to a direction of an electric field formed between the first electrode and the second electrode. The semiconductor device may be further configured to form a depletion region or an accumulation region in the semiconductor layer according to the polarization direction of the polarization of the ferroelectric layer.
Implementation Method 2
The conductive metal oxide layer may have a crystal direction that is the same as or similar to a desired crystal direction of the ferroelectric layer. A difference in lattice constant between the ferroelectric layer and the conductive metal oxide layer may be relatively small.
Data Source
AI summary
A semiconductor apparatus includes a plurality of semiconductor devices. The semiconductor devices each include a ferroelectric layer, a conductive metal oxide layer, and a semiconductor layer, between two electrodes. The conductive metal oxide layer may be between the ferroelectric layer and the semiconductor layer. The ferroelectric layer, the conductive metal oxide layer, and the semiconductor layer may all include a metal oxide. The conductive metal oxide layer may include one or more materials selected from the group consisting of an indium oxide, a zinc oxide, a tin oxide, and any combination thereof.