E-fuse Gate Metal Capacitor Structure for Low Program Current
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Solution Overview
Problem
Existing semiconductor fuses require high program current, which occupies a large area and hampers the reduction of fuse size, necessitating a technique to lower program current to minimize the fuse area.
Innovation Solution
The e-fuse design includes first and second electrodes, a gate metal that electrically couples them, a semiconductor layer forming a capacitor with the gate metal, and a first oxide layer on both sides of the semiconductor layer, allowing for low program current operation and reduced fuse area through capacitance changes and electro-migration phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If conventional fuse design is used, then the fuse can be blown, but high program current is required which occupies large area
Solution Approach 1:
The patent changes the electrical parameters of the gate metal by introducing a semiconductor layer beneath it, forming a capacitor structure. This modification alters the gate metal's resistance characteristics, enabling the fuse to operate with lower program current (e.g., 100μA to 1mA range) while maintaining the ability to be blown effectively, thus resolving the contradiction between reducing fuse area and maintaining blow capability.
Solution Approach 2:
The patent creates a composite structure by combining the gate metal with a semiconductor layer to form a capacitor. This composite configuration modifies the electrical properties of the gate metal, reducing its resistance and enabling low-current operation. The composite material approach allows the fuse to achieve both small area and low program current requirements simultaneously.
2Power
If selection element is made large to provide sufficient program current, then program current is adequate, but fuse area increases
Solution Approach 1:
The patent replaces the conventional approach of using a large selection element (mechanical/geometric solution) with an electrical field-based solution. By introducing the semiconductor layer and forming a capacitor, the system uses electrical field effects to modify the gate metal's resistance, enabling sufficient program current capability in a compact area without relying on large physical dimensions.
Solution Approach 2:
The patent changes the electrical parameters of the gate metal through the capacitor structure, reducing its resistance and enabling adequate program current to be achieved with a smaller selection element area, thus resolving the contradiction between power capability and area.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables improved performance by allowing high on/off ratios and reducing the area per bit of the e-fuse, as it can be blown with low program current, enhancing semiconductor device efficiency.
Implementation Method 1
a semiconductor layer formed under the gate metal, and forming a capacitor together with the gate metal
Implementation Method 2
allowing for low program current operation and reduced fuse area through capacitance changes and electro-migration phenomena
Data Source
AI summary
An e-fuse for a semiconductor device includes first and second electrodes; a gate metal electrically coupling the first and second electrodes with each other; a semiconductor layer formed under the gate metal, and forming a capacitor together with the gate metal; and a first oxide layer formed under the gate metal and on both sides of the semiconductor layer.