Semiconductor Cell Structure for On-Resistance Reduction
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Solution Overview
Problem
Semiconductor components with trench structures face challenges in current flow and on-resistance due to inactive regions near the gate terminal, leading to potential destruction from avalanche effects, and require complex electrode connections that increase space requirements.
Innovation Solution
The semiconductor component includes a semiconductor body with a first and second component electrode, and a control electrode, featuring a second active cell array in a partial region below the control electrode, connected via a thin conductive layer and trench structures, allowing body zones to be connected to source zones for enhanced current flow and reduced on-resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a source zone is omitted in the partial region to ensure robustness, then the transistor arrangement can be protected from parasitic npn bipolar transistor activation, but the body zones cannot be contact-connected with source metallization and the region does not contribute to current flow or reduce on resistance
Solution Approach 1:
The patent divides the semiconductor body into a central region with full transistor structures and partial regions with reduced structures. The active cell array is segmented into cells that are selectively positioned in different regions, allowing the partial regions to maintain robustness while the central region provides full functionality for current flow and on-resistance reduction.
Solution Approach 2:
Different regions of the semiconductor body are given different structures and functions. The central region contains complete transistor structures with source zones for optimal current flow, while the partial regions omit source zones to ensure robustness. This local differentiation allows each region to optimize its specific function without compromising the other.
2Reliability
If all electrodes in the partial region are led upwards and connected, then the partial region can be electrically connected, but the space requirement becomes very large and electrodes at deeper levels must be connected further outwards
Solution Approach 1:
The patent utilizes vertical dimensionality by positioning the active cell array below the component electrodes rather than only lateral connections. The cell control electrodes extend vertically into the semiconductor body to contact the active cells, reducing the need for extensive lateral metal interconnect structures and minimizing the overall device footprint.
Solution Approach 2:
The patent implements a nested structure where the active cell array is positioned beneath the component electrodes, and the cell control electrodes are embedded within the semiconductor body structure. This nesting allows multiple functional elements to occupy overlapping spatial regions, reducing the total space required for electrical connections.
3Device complexity
If the component control electrode is arranged only on the central region, then the transistor arrangement can be simplified, but the active cell array cannot be fully utilized and performance is reduced
Solution Approach 1:
The component control electrode structure is designed to serve multiple functions: it controls both the central region transistors and the partial region cells through the same electrode structure. The cell control electrodes extend to contact active cells in both central and partial regions, allowing a single control electrode arrangement to manage the entire active cell array without requiring separate control structures.
Data Source
AI summary
A semiconductor component comprises a semiconductor body comprising a first component electrode arranged on one of the surfaces of the semiconductor body, a second component electrode arranged on one of the surfaces of the semiconductor body, and a component control electrode arranged on one of the surfaces of the semiconductor body. In this case, active semiconductor element cells are arranged in a first active cell array of the semiconductor body, the semiconductor element cells comprising a first cell electrode, a second cell electrode and a cell control electrode and also a drift path between the cell electrodes. At least the component control electrode is arranged on a partial region of the semiconductor body and a second active cell array is additionally situated in the partial region of the semiconductor body below the component control electrode.