Semiconductor Insulation Cavities for Compact Device Design
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Solution Overview
Problem
Thick insulation layers in semiconductor devices are required to prevent electrical breakdown, but they increase the device size and require more space, posing a challenge in compact design.
Innovation Solution
The method involves forming recesses in the semiconductor substrate, creating auxiliary structures within these recesses, filling them with conductive material, and then partially removing the auxiliary structures to create cavities, which are then sealed, allowing for effective insulation while minimizing space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thick insulation layers are used to prevent electrical breakdown, then reliability is improved, but device size increases
Solution Approach 1:
The insulation structure is segmented into multiple functional layers: a first insulating layer directly on the semiconductor substrate, a cavity structure, and a second insulating layer filling the cavity. This segmentation allows each layer to perform its specific function optimally while reducing the total insulation thickness required compared to a single thick layer.
Solution Approach 2:
The invention transitions from a one-dimensional thick insulation layer to a multi-dimensional structure with vertical cavities and lateral insulation layers. The cavity extends vertically into the substrate, providing insulation path length in the vertical dimension while allowing the horizontal dimension to be reduced for compact device size.
2Reliability
If thick insulation layers are used to ensure electrical insulation, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The cavity structure is formed preliminarily through selective etching before the second insulating layer is deposited. This preliminary formation of the cavity pattern allows subsequent insulation layers to be deposited conformally, simplifying the overall manufacturing process compared to attempting to deposit a single thick insulation layer with the required precision.
Solution Approach 2:
Different regions of the device have different insulation structures: areas requiring high voltage isolation have the cavity structure with extended insulation path, while other areas use standard thin insulation layers. This local differentiation optimizes reliability where needed while minimizing overall device complexity and size.
Data Source
AI summary
A method for manufacturing a semiconductor device includes: forming a recess in a semiconductor substrate, the recess having a bottom and a sidewall extending from the bottom to a first side of the semiconductor substrate; forming an auxiliary structure on the sidewall and the bottom of the recess and forming a hollow space within the recess; filling the hollow space with a filling material; forming a plug on the first side of the semiconductor substrate to cover the auxiliary structure at least on the sidewall of the recess; forming an opening in the plug to partially expose the auxiliary structure in the recess; removing the auxiliary structure at least partially from the sidewall of the recess to form cavities between the auxiliary structure and the sidewall; and sealing the opening in the plug.