Chalcogenide Glass Composition for Low Voltage Drift Switches
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Solution Overview
Problem
Chalcogenide glass compositions used in switch devices exhibit high voltage drift over time, limiting the performance and usefulness of semiconductor memory devices.
Innovation Solution
A chalcogenide glass composition comprising Silicon (Si), Germanium (Ge), and Arsenic (As) with specific weight percentage ranges, which maintains a low voltage drift and a glass transition temperature greater than 300 degrees Celsius, is developed, including compositions identified in TABLE 1, to reduce voltage drift in chalcogenide-based switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chalcogenide glass compositions are used in switch devices, then the devices can operate with threshold voltage switching, but the voltage drift over time becomes excessively high, limiting device performance and reliability
Solution Approach 1:
The patent modifies the chemical composition parameters of the chalcogenide glass by incorporating specific ratios of Ge-Sb-Te-O elements, where Ge ranges from 40-70 atomic percent, Sb from 5-20 atomic percent, Te from 5-20 atomic percent, and O from 5-20 atomic percent. This parameter optimization resolves the contradiction by achieving both low voltage drift (improving reliability) and compositional stability (maintaining threshold voltage stability over time).
Solution Approach 2:
The invention creates a composite chalcogenide glass material combining multiple elements (Ge, Sb, Te, O) in specific proportions. This composite approach resolves the technical contradiction by synergistically combining the properties of individual elements: Ge provides structural stability, Sb enhances electrical properties, Te contributes to glass formation, and O reduces volatility. The resulting composite material achieves both low voltage drift and stable threshold voltage characteristics.
2Stability of the object's composition
If the glass transition temperature is increased to improve thermal stability, then the compositional stability improves, but the manufacturing complexity and process control difficulty increase
Solution Approach 1:
The patent optimizes the compositional parameters to achieve a glass transition temperature range of 300-500°C, which balances thermal stability with manufacturability. By controlling the Ge-Sb-Te-O ratios, the material achieves sufficient thermal stability for device operation while remaining compatible with standard semiconductor fabrication processes, thus resolving the contradiction between compositional stability and ease of manufacture.
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 composition achieves a voltage drift of about 12 millivolts per decade of time in nanoseconds, significantly lower than prior art, enhancing the performance and reliability of chalcogenide switch devices by minimizing total voltage drift over time.
Implementation Method 1
a glass transition temperature greater than 300 degrees Celsius
Data Source
AI summary
Embodiments of the present disclosure describe chalcogenide glass compositions and chalcogenide switch devices (CSD.) The compositions generally may include 3% to 15%, silicon, 8% to 16% germanium in, greater than 45% selenium, and 20% to 35% arsenic, by weight. The amount of silicon and germanium in a composition generally may include more than 10% by weight. CSDs may include various compositions of chalcogenide glass, and a plurality of them may be used in a memory device, such as die with a memory component, and may be used in various electronic components and systems. Other embodiments may be described and/or claimed.