Crystalline Silicon Bit Line for Reversible Resistivity Memory
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Semiconductor memory devices face challenges such as increased variability in memory cell I-V characteristics and leakage currents due to process, voltage, and temperature variations, particularly as process geometries shrink, affecting the reliability and efficiency of non-volatile memory devices.
Innovation Solution
The use of a reversible resistivity memory structure with a crystalline silicon bit line, where a hollow pillar of crystalline silicon is embedded within a hollow pillar of reversible resistivity material, acting as a channel and bit line, reduces leakage currents and enhances electron mobility by minimizing grain boundaries and defects, thereby improving memory cell performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If process geometries are shrunk to reduce cost per bit, then storage density is improved, but leakage currents increase and variability in memory cell I-V characteristics worsens
Solution Approach 1:
The patent changes the material parameter from amorphous silicon to crystalline silicon, which fundamentally alters the electrical characteristics by reducing leakage currents and minimizing variability in I-V characteristics. This material parameter change enables continued scaling while maintaining reliability.
Solution Approach 2:
The invention uses a composite structure combining crystalline silicon channel with reversible resistivity material, creating a hybrid memory cell that leverages the low-defect crystalline silicon for reliable current conduction while using the reversible resistivity material for non-volatile storage functionality.
2Quantity of substance
If process geometries are shrunk to reduce cost per bit, then storage density is improved, but leakage currents increase
Solution Approach 1:
The patent changes the material parameter from amorphous silicon to crystalline silicon, which fundamentally alters the electrical characteristics by reducing leakage currents and minimizing variability in I-V characteristics. This material parameter change enables continued scaling while maintaining reliability.
3Ease of manufacture
If amorphous silicon bit line is used, then manufacturing is easier, but electron mobility is lower and leakage currents are higher
Solution Approach 1:
The patent changes the material parameter from amorphous silicon to crystalline silicon, which fundamentally alters the electrical characteristics by reducing leakage currents and minimizing variability in I-V characteristics. This material parameter change enables continued scaling while maintaining reliability.
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 reduces leakage currents and increases electron mobility, leading to improved memory cell current and reliability, allowing for more efficient and scalable non-volatile memory devices.
Implementation Method 1
enhances electron mobility by minimizing grain boundaries and defects
Data Source
AI summary
Technology is described for reversible resistivity memory having a crystalline silicon bit line. In one aspect, a memory structure comprises a hollow pillar of crystalline silicon inside of reversible resistivity material. The crystalline silicon may serve as a bit line. The memory structure may further comprise conductive material that forms word lines coupled to the outer surface of the reversible resistivity material. A memory cell comprises a portion of the reversible resistivity material between the crystalline silicon and one of the word lines. In one aspect, the hollow pillar of crystalline silicon surrounds a gate oxide, which surrounds a conductive transistor gate. Thus, the hollow pillar of crystalline silicon may function as a channel of a transistor. In one aspect, the crystalline silicon has predominantly a (100) orientation with respect to an inner surface of the reversible resistivity material. In one aspect, the crystalline silicon is a single crystal.