Phase-Change Memory Device with InSbTe Alloy Composition
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Solution Overview
Problem
Current non-volatile memory devices using phase-change materials face challenges in reducing power consumption and increasing integration due to high reset current requirements, which hinder the development of high-capacity, low-power semiconductor products.
Innovation Solution
A non-volatile memory device is designed with a phase-change material layer composed of specific alloys, such as InXSbYTeZ, where X, Y, and Z are within certain atomic ratios, and optionally modified by replacing elements with Si, Sn, As, Bi, or Se, to reduce reset current and enhance thermal stability, thereby lowering operating voltage and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional phase-change materials are used in non-volatile memory devices, then the devices can store data non-volatently, but the reset current requirement is high which increases power consumption
Solution Approach 1:
The patent modifies the phase-change material composition by adjusting the atomic ratios of In, Sb, and Te elements according to Formula 1 (InX(Sb1-Y)TeZ where X+Y+Z=1, with specific ranges: 0.1≤X≤0.3, 0.5≤Y≤0.7, 0.6≤Z≤0.8). This compositional parameter change reduces the reset current while maintaining thermal stability and data retention characteristics, directly resolving the contradiction between power consumption and reliability
Solution Approach 2:
The patent creates a composite phase-change material system combining In-Sb-Te elements in specific proportions. This composite material approach allows optimization of both electrical properties (lower reset current) and thermal properties (maintained stability), achieving reduced power consumption without sacrificing data retention reliability
2Use of energy by moving object
If the phase-change material composition is optimized to reduce reset current, then power consumption decreases, but thermal stability may be compromised
Solution Approach 1:
The patent carefully balances the atomic ratios in the In-Sb-Te phase-change material (Formula 1: InX(Sb1-Y)TeZ with constrained ranges) to simultaneously achieve low reset current and high thermal stability. The specific composition parameters are optimized so that Sb content (controlled by Y) provides thermal stability while In and Te content (X and Z) reduce reset current, resolving the contradiction between power consumption and thermal stability
3Productivity
If conventional phase-change materials are used, then the device structure is simple, but the sensing margin is insufficient which limits integration capacity
Solution Approach 1:
The patent optimizes the phase-change material composition parameters (In:X, Sb:1-Y, Te:Z ratios in Formula 1) to enhance the resistance difference between crystalline and amorphous states. This improved sensing margin allows for more reliable data detection in highly integrated devices, directly supporting increased integration capacity while maintaining manufacturing feasibility
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 proposed memory device achieves lower reset currents, improved thermal stability, and increased sensing margins, enabling the development of memory devices with low power consumption and high integration capabilities.
Implementation Method 1
The phase-change material has a crystalline state or an amorphous state depending on the temperature of the phase-change material. Resistivity in the crystalline state is lower than resistivity in the amorphous state.
Implementation Method 2
The phase-change material has a crystalline state or an amorphous state depending on the temperature of the phase-change material
Data Source
AI summary
A non-volatile memory device including a phase-change material, which has a low operating voltage and low power consumption, includes a lower electrode; a phase-change material layer formed on the lower electrode so as to be electrically connected to the lower electrode, wherein the phase-change material layer includes a phase-change material having a composition represented by InXSbYTeZ or, alternatively, with substitutions of silicon and/or tin for indium, arsenic and/or bismuth for antimony, and selenium for tellurium; and an upper electrode formed on the phase-change material layer so as to be electrically connected to the phase-change material layer.