Flash Memory Common Source Conductive Protective Layer
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Solution Overview
Problem
The existing flash memory devices face performance issues due to the reaction between common source material and channel material, which forms an oxide that is difficult to remove, impairing electrical contact quality and device performance.
Innovation Solution
The implementation of a conductive protective material over oxygen-sensitive metal silicide, which reacts slowly or not at all with oxygen, forming a stable interface that prevents the formation of problematic oxides, and allowing for the formation of a heavily doped channel material with improved electrical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common source material is directly exposed to oxygen during fabrication, then oxidation occurs forming difficult-to-remove oxide, but this oxide formation impairs electrical contact quality and device performance
Solution Approach 1:
A protective material layer is introduced as an intermediary between the common source material and oxygen environment. This protective material prevents oxygen from reaching and oxidizing the common source material during fabrication processes, thereby maintaining electrical contact quality without requiring complex oxide removal steps
Solution Approach 2:
The patent creates an oxygen-excluding environment by forming a protective material barrier that isolates the oxygen-sensitive common source material from atmospheric oxygen. This inert protection allows the common source material to maintain its metallic properties and electrical conductivity throughout subsequent fabrication steps
2Reliability
If protective material is formed over common source material to prevent oxidation, then electrical contact quality is maintained, but additional fabrication steps are required
Solution Approach 1:
The protective material serves multiple functions simultaneously: it acts as an oxygen barrier to prevent oxidation, provides a planarization layer for subsequent deposition processes, and can serve as an etch stop layer. This multi-functionality reduces the need for additional separate process steps despite the added protective layer
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 solution enhances the electrical contact between the channel and common source materials, improving the performance and reliability of flash memory devices by preventing oxide formation and ensuring stable operation.
Implementation Method 1
the common source material may react with oxygen to form an oxide 36 which is difficult to remove
Data Source
AI summary
Some embodiments include a memory array which has a stack of alternating first and second levels. Channel material pillars extend through the stack, and vertically-stacked memory cell strings are along the channel material pillars. A common source is under the stack and electrically coupled to the channel material pillars. The common source has conductive protective material over and directly against metal silicide, with the conductive protective material being a composition other than metal silicide. Some embodiments include methods of fabricating integrated structures.