Helium-Treated Protection Layer for Semiconductor Memory Cell Reliability

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing semiconductor devices face challenges in maintaining the characteristics of variable resistance layers and selector layers due to deterioration from subsequent processes and external influences, leading to issues like dead layer formation and dopant loss, which affect the reliability and performance of memory cells.

Innovation Solution

A helium treatment process is applied to form a protection layer on the memory cell, modifying its surface morphology and preventing diffusion of elements, thereby reducing the adverse effects of subsequent encapsulation layers and maintaining the original characteristics of the variable resistance and selector layers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If subsequent encapsulation layers are formed on the memory cell, then the memory cell is protected from external influences, but the characteristics of the variable resistance layer and selector layer deteriorate due to dead layer formation and dopant loss

Engineering Contradiction:

Improveprotection from external influencesVSAvoidcharacteristics of variable resistance layer and selector layer

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

A protection layer is formed on the memory cell before forming the encapsulation layer. This preliminary protective measure prevents direct contact between the encapsulation layer and the sensitive memory cell components, thereby avoiding dead layer formation and dopant loss while still providing the necessary protection from external influences.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The protection layer acts as an intermediary between the memory cell and the encapsulation layer. This intermediate layer serves as a barrier that protects the variable resistance layer and selector layer from the adverse effects of the encapsulation process, maintaining their original characteristics while allowing the encapsulation layer to provide external protection.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If the memory cell structure is maintained without protection layer, then the manufacturing process is simpler, but the variable resistance layer and selector layer suffer from dopant loss and dead layer formation

Engineering Contradiction:

Improvemanufacturing process simplicityVSAvoiddopant loss and dead layer formation

Core Design Contradiction:

Ease of manufactureVSLoss of substance

Solution Approach 1:

The protection layer is formed as a preliminary step in the manufacturing process, before the encapsulation layer is deposited. This preliminary action prevents dopant loss and dead layer formation during subsequent processing steps, ensuring the integrity of the memory cell components without significantly complicating the overall manufacturing process.

Inventive Principle:

Principle #10Preliminary action

3Manufacturing precision

If helium treatment is applied to form protection layer, then dead layer formation is prevented and crystal structure integrity is maintained, but the manufacturing process becomes more complex

Engineering Contradiction:

Improvecrystal structure integrity and prevention of dead layer formationVSAvoidmanufacturing process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The helium treatment process replaces traditional mechanical or chemical protection methods with a plasma-based approach. Helium plasma is used to modify the surface of the memory cell, forming a protection layer that prevents dead layer formation and maintains crystal structure integrity without requiring complex mechanical intervention or multiple chemical processing steps.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 helium treatment enhances the reliability of the memory cells by preventing dead layer formation, maintaining crystal structure integrity, and reducing dopant loss, thus improving the overall performance and longevity of the semiconductor device.

Implementation Method 1

forming a protection layer on the memory cell and the substrate by performing a first helium treatment process on the memory cell

Methodology Applied

Scientific EffectHelium treatment:

Data Source

PatentUS20230171967A1Semiconductor device and method for fabricating the same

Publication Date: 2023.06.01 SK HYNIX INC

AI summary

A semiconductor device may include: a memory cell disposed over a substrate and including a variable resistance layer and a selector layer; a protection layer disposed on side surfaces of the memory cell and an upper surface of the substrate on which the memory cell is not disposed; and a first encapsulation layer disposed on the memory cell and the protection layer, wherein the protection layer may include a treated surface that is modified by a material including helium.