Semiconductor Isolation Using Encapsulation Material Within Trench
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Solution Overview
Problem
Conventional semiconductor packages are often large and expensive due to the need for proper isolation between multiple transistors, which complicates the integration of transistors on a single chip and increases manufacturing costs.
Innovation Solution
A semiconductor device design that includes a wafer substrate with distinct regions for different transistors, an isolation area between them, and an encapsulation material that contacts the backplate and is located within the isolation area, providing effective isolation between transistors while minimizing cross-conduction and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transistors are integrated on a single chip, then device functionality and efficiency are improved, but isolation between transistors becomes difficult to achieve, leading to cross-conduction and crosstalk
Solution Approach 1:
The chip is divided into distinct first and second regions with an isolation area between them. The isolation area is further segmented by removing portions of the wafer substrate and filling with encapsulation material to create separate isolation regions for different transistor types, preventing cross-conduction and crosstalk while maintaining integration.
Solution Approach 2:
Different regions of the chip are assigned different functions: the first region contains power FETs, the second region contains sensor FETs, and the isolation area between them contains encapsulation material specifically for electrical isolation. This local differentiation ensures proper isolation where needed while maintaining integration elsewhere.
2Reliability
If proper isolation structures are implemented between transistors, then cross-conduction is reduced, but device area and manufacturing complexity increase
Solution Approach 1:
The isolation structure extends in multiple dimensions: vertically through the wafer substrate and horizontally across the isolation area. By removing portions of the substrate and filling with encapsulation material that contacts both the front surface (conductive pads) and back surface (backplate), isolation is achieved in three-dimensional space, maximizing isolation effectiveness while minimizing lateral footprint.
3Reliability
If traditional isolation methods are used, then transistor isolation is achieved, but manufacturing cost increases
Solution Approach 1:
The isolation structure merges multiple functions into a single encapsulation material layer: electrical isolation between transistors, mechanical support, and potential hermetic sealing. This consolidation reduces the number of separate isolation structures needed, simplifying the manufacturing process and reducing costs while maintaining reliable isolation.
Data Source
AI summary
According to an aspect, a semiconductor device for integrating multiple transistors includes a wafer substrate including a first region and a second region, where the first region defines at least a portion of at least one first transistor and the second region defines at least a portion of at least one second transistor. The semiconductor device includes an isolation area located between the first region and the second region, at least one conductive pad of the at least one first transistor contacting the first region of the wafer substrate, at least one conductive pad of the at least one second transistor contacting the second region of the wafer substrate, a backplate coupled to the wafer substrate, and an encapsulation material, where the encapsulation material has a portion contacting the backplate, and the encapsulation material includes a portion located within the isolation area.