Semiconductor Contact Structure with Spacer Isolation
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Solution Overview
Problem
Conventional methods for forming contacts in semiconductor devices face challenges in efficiently reducing the distance between contacts, leading to potential electrical shorts and difficulties in achieving high integration densities.
Innovation Solution
A method involving the formation of conductive structures with spacers and insulating layers to create a contact structure where spacers electrically isolate conductive structures, allowing for the reduction of contact distance by etching and planarization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional photolithography and etching processes are used to form contacts, then the manufacturing process is simple and easy to implement, but the distance between contacts cannot be efficiently reduced, leading to potential electrical shorts and limited integration density
Solution Approach 1:
The contact formation process is divided into multiple stages: first forming initial contacts with spacers, then selectively removing insulating material between contacts to create separated contact regions. This segmentation allows precise control of contact spacing and prevents electrical shorts while maintaining manufacturing feasibility
Solution Approach 2:
Spacers are formed on the sidewalls of holes before the final contact material deposition. These spacers serve as preliminary structures that define the minimum distance between contacts, ensuring proper spacing is established before subsequent processing steps
2Quantity of substance
If the distance between contacts is reduced to increase integration density, then more contacts can be packed in the same area, but electrical shorts between adjacent contacts may occur
Solution Approach 1:
An insulating layer is introduced as an intermediary material between adjacent conductive contacts. This insulating layer acts as a mediator that prevents direct electrical contact between neighboring contacts while allowing them to be positioned closely together, thus enabling high integration density without sacrificing electrical isolation
Solution Approach 2:
The insulating material is selectively removed only in specific regions between contacts where electrical isolation is needed, while maintaining insulation in other areas. This local differentiation allows precise control of electrical connectivity and isolation properties at different locations
Data Source
AI summary
In a method of forming a contact structure, first and second conductive structures may be formed on a lower structure to be spaced from each other. An insulating layer may be formed on the lower structure to cover the first and second conductive structures. A first hole exposing the first conductive structure may be formed through the insulating layer. A spacer may be formed on a sidewall of the first hole. A first contact electrically coupled to the first conductive structure may be formed in the first hole having the sidewall on which the spacer is formed. A portion of the insulating layer located between the spacers may be removed to form a second hole exposing the second conductive structure. A second contact electrically coupled to the second conductive structure may be formed in the second hole.