Graphene-Based eFuse for Reliable Fuse Blowing Control
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Solution Overview
Problem
Conventional silicide-based eFuse devices face challenges in controlling the 'blowing' process, as insufficient current results in incomplete migration, while excessive current can cause overheating, leading to voids or hillocks, damaging the circuit.
Innovation Solution
A graphene-based eFuse structure is introduced, where a graphene layer is used as an electrical fuse, allowing for precise control through high current passage, which burns away to create a gap, thereby controlling the circuit's conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high current is passed through silicide layer to create discontinuity, then fuse blowing is achieved, but overheating occurs causing voids or hillocks that damage the circuit
Solution Approach 1:
The patent changes the material parameter from silicide to graphene, which has superior thermal conductivity and electrical conductivity. This parameter change allows the fuse to operate at lower currents and temperatures while achieving reliable discontinuity, thereby resolving the overheating damage issue while maintaining fuse blowing reliability
Solution Approach 2:
The patent uses graphene as a composite material replacement for conventional silicide layers. Graphene's unique properties (high thermal and electrical conductivity, mechanical strength) create a composite structure that prevents overheating damage while enabling controlled fuse blowing, thus resolving the contradiction between reliability and harmful thermal effects
2Reliability
If current is increased to ensure complete migration, then fuse reliability improves, but circuit damage occurs due to excessive heat
Solution Approach 1:
By changing the material parameter from silicide to graphene, the patent achieves complete migration at lower current levels. Graphene's high electrical conductivity enables efficient current passage for reliable discontinuity formation, while its high thermal conductivity dissipates heat effectively, preventing circuit temperature rise
3Ease of manufacture
If conventional silicide layer is used, then manufacturing process is established, but precise control of blowing process is difficult
Solution Approach 1:
The patent changes the material parameter to graphene, which has more predictable and controllable electrical and thermal properties. This enables precise control of the blowing process through better parameter management, while graphene's compatibility with existing semiconductor manufacturing processes maintains ease of manufacture
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
The graphene-based eFuse provides a more controlled and efficient method for creating a permanent discontinuity, avoiding overheating issues and ensuring reliable circuit operation.
Implementation Method 1
By flowing high current through the silicide layer, a large amount of heat is generated
Implementation Method 2
allowing for precise control through high current passage, which burns away to create a gap
Data Source
AI summary
A method of forming a semiconductor device includes forming a field-effect transistor (FET), and forming a fuse which includes a graphene layer and is electrically connected to the FET.