Lateral Power Transistor Insulator Protrusion Misalignment
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Solution Overview
Problem
Conventional power transistors face challenges in maintaining a high breakdown voltage (BVdss) while keeping specific on-resistance (sRon) low, especially due to misalignment tolerances during manufacturing, which affects their performance and reliability.
Innovation Solution
The design incorporates an insulator region with specific features that extend towards a well region, creating a three-dimensional layout that reduces current crowding and stabilizes electric fields, thereby maintaining a high BVdss and low sRon even with misalignment, using a lateral power transistor structure with a p-type and n-type well region and a gate structure that covers the interface between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power transistor structures are used, then manufacturing is simpler, but breakdown voltage decreases and on-resistance increases due to misalignment tolerances
Solution Approach 1:
The patent transitions from a conventional planar isolation structure to a three-dimensional protruding insulator structure that extends vertically into the first well region. This dimensional change creates a more robust electric field configuration that maintains breakdown voltage and on-resistance performance even when lateral alignment varies during manufacturing, directly addressing the sensitivity to misalignment tolerances.
Solution Approach 2:
The insulator region is segmented into multiple protruding features rather than a single continuous structure. These segmented protrusions create multiple discrete barriers to current flow, which stabilizes the electric field distribution and reduces the impact of misalignment on overall device performance, while also lowering specific on-resistance through better field management.
2Reliability
If conventional isolation structures are used, then device complexity is lower, but current crowding increases and electric fields become unstable
Solution Approach 1:
The insulator structure extends in the vertical dimension into the well region, creating a three-dimensional configuration from a conventional two-dimensional planar structure. This adds spatial control over electric field distribution, stabilizing fields and reducing current crowding at the interface between well regions, while the complexity increase is localized to the isolation structure rather than the entire device.
Data Source
AI summary
An electronic device can include a first well region of a first conductivity-type and a second well region of a second conductivity-type and abutting the first well region. The first conductivity-type and the second conductivity type can be opposite conductivity types. In an embodiment, an insulator region can extend into the first well region, wherein the insulator region and the first well region abut and define an interface, and, from a top view, the insulator region can include a first feature extending toward the first interface, and the insulator region can define a first space bounded by the first feature, wherein a dimension from a portion of the first feature closest to the first interface is at least zero. A gate structure can overlie an interface between the first and second well regions.