Chalcogen Compound Selection Device for Low Leakage Current
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Solution Overview
Problem
Semiconductor devices with ovonic threshold switching characteristics face challenges in maintaining low off-current and high reliability due to high leakage current and durability issues, especially when the number of devices increases, leading to operational difficulties and reduced endurance over time.
Innovation Solution
The use of a selection device layer comprising two or more chalcogen compound layers with different energy band gaps, each independently including elements such as germanium, sulfur, selenium, and tellurium, to stabilize switching characteristics and reduce leakage current, while improving durability through controlled electron movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single chalcogen compound layer is used for the selection device, then the device structure is simple, but the off-current is high and reliability is poor
Solution Approach 1:
The selection device layer is divided into multiple chalcogen compound layers (first chalcogen compound layer and second chalcogen compound layer) with different compositions and energy band gaps. This segmentation allows each layer to contribute different switching characteristics, achieving low off-current and high reliability while maintaining manageable structural complexity through systematic layer design.
Solution Approach 2:
The invention uses composite chalcogen compound layers with different compositions (e.g., GeSbTe, GeTe, SbTe) stacked together to form the selection device layer. Each material layer has specific properties that complement the others, creating a composite structure that achieves superior switching characteristics and reliability compared to single-material layers.
2Productivity
If the number of semiconductor devices is increased to meet high integration demand, then device integration is improved, but leakage current increases and operational difficulties arise
Solution Approach 1:
The invention changes the energy band gap parameter by using multiple chalcogen compound layers with different compositions. The first layer has a smaller energy band gap for efficient switching, while the second layer has a larger energy band gap to suppress leakage current. This parameter optimization enables high device integration while maintaining low leakage current characteristics.
3Duration of action of stationary object
If conventional chalcogen compound layers are used, then manufacturing is simpler, but durability and endurance are reduced over time
Solution Approach 1:
The selection device layer is segmented into multiple chalcogen compound layers, each with specific compositional requirements. This segmentation allows for optimized durability in each layer while maintaining compatibility with existing manufacturing processes through standardized deposition techniques for forming multiple thin layers.
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 achieves low off-current values and enhanced durability, enabling stable and reliable operation of semiconductor devices with improved endurance and integration capabilities.
Implementation Method 1
a selection device layer exhibiting ovonic threshold switching characteristics
Data Source
AI summary
A chalcogen compound layer exhibiting ovonic threshold switching characteristics, a switching device, a semiconductor device, and/or a semiconductor apparatus including the same are provided. The switching device and/or the semiconductor device may include two or more chalcogen compound layers having different energy band gaps. Alternatively, the switching device and/or semiconductor device may include a chalcogen compound layer having a concentration gradient of an element of boron (B), aluminum (Al), scandium (Sc), manganese (Mn), strontium (Sr), and/or indium (In) in a thickness direction thereof. The switching device and/or a semiconductor device may exhibit stable switching characteristics while having a low off-current value (leakage current value).