Conductive Island Source Structure for Reliable Memory Contacts
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Solution Overview
Problem
Conventional memory devices experience poor electrical connections due to vertical conductive structures failing to completely land on conductive pads, leading to reduced reliability and performance.
Innovation Solution
The use of conductive islands with specific dimensions and dielectric isolators to ensure proper alignment and contact between vertical contact structures and conductive islands, preventing falloff and enhancing electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conductive pads are used with standard dimensions, then the manufacturing process is simple, but the electrical connection reliability deteriorates due to vertical conductive structures failing to land completely on the pads
Solution Approach 1:
The patent applies local quality by creating conductive islands with non-uniform widths - specifically, the conductive island has a first width at its top surface and a second width at its bottom surface, with the first width being greater than the second width. This gradual transition provides a tapered geometry that guides the vertical conductive structure to land completely on the conductive island, improving electrical connection reliability without requiring complex alignment processes
Solution Approach 2:
The patent implements preliminary action by pre-forming the conductive islands with the specific tapered geometry (greater top width than bottom width) before forming the vertical conductive structures. This pre-prepared geometric configuration proactively guides the vertical conductive structures to land completely on the conductive islands, preventing falloff issues before they occur and ensuring reliable electrical connections
2Manufacturing precision
If conductive islands with varying widths are used, then the alignment and contact between vertical contact structures and conductive islands improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies asymmetry by designing conductive islands with different widths at different heights - the top surface width is deliberately made greater than the bottom width. This asymmetric, tapered geometry creates a self-aligning feature that guides the vertical conductive structures to land completely on the conductive islands, improving alignment precision while the gradual transition keeps manufacturing complexity manageable
Data Source
AI summary
Some embodiments include apparatuses. One of the apparatuses includes a conductive structure including a first conductive region under first memory cells, a second conductive region under second memory cells, and a third conductive region between the first and second conductive regions; conductive islands adjacent each other and formed in the third conductive region and separated from the third conductive region; dielectric isolators separating the conductive islands from each other, wherein the conductive islands include a conductive island such that a first portion of the conductive islands is located on a first side of the conductive island, and a second portion of the conductive islands is located on a second side of the conductive island; and the width of the conductive island is greater than the width of at least one conductive island in each of the first and second portions of the conductive islands.