Semiconductor Fuse Repair via Melted Metal Coupling
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Solution Overview
Problem
The existing fuse cutting method in semiconductor memory devices is inefficient due to difficulties in controlling the thickness of the insulation layer, leading to failed repairs and damage to adjacent fuse lines, resulting in low yield and inefficiency in replacing defective cells.
Innovation Solution
The use of melted metal to couple fuse lines instead of traditional fuse cutting, with specific conductive and insulation patterns formed to facilitate easier repair by adjusting the width and thickness of the metal and nitride-based patterns, preventing damage to adjacent fuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the traditional fuse cutting method is used, then the repair process can be performed, but the thickness control of the insulation layer becomes difficult leading to failed repairs and damage to adjacent fuse lines
Solution Approach 1:
The patent replaces the mechanical fuse cutting method with a field-based approach. Instead of physically cutting the fuse line through mechanical means (laser cutting through insulation), the invention uses electrical field or current to melt and separate the fuse line. This substitution eliminates the need for precise insulation layer thickness control, as the melting process occurs within the conductive material itself regardless of the insulation layer dimensions.
Solution Approach 2:
The invention changes the fundamental parameter of the repair process from mechanical removal to thermal melting. By applying sufficient current or electrical field, the fuse line material undergoes phase change from solid to liquid and then solidifies in a separated state. This parameter change makes the process independent of insulation layer thickness, as the melting occurs at the fuse line material's melting point rather than relying on mechanical force through the insulation layer.
2Productivity
If the fuse cutting process is performed, then defective cells can be replaced, but remnants are generated and adjacent fuse lines may be damaged
Solution Approach 1:
The patent replaces mechanical cutting with electrical/thermal melting. The melting process is more localized and controllable than mechanical cutting, as the heat affects primarily the conductive fuse line material with minimal impact on surrounding insulation layers. This eliminates the generation of mechanical remnants and reduces the risk of damaging adjacent fuse lines through mechanical stress or debris.
Solution Approach 2:
The invention introduces an electrical field or current as an intermediary medium to perform the separation. This intermediary allows for precise energy delivery to the fuse line without physical contact, enabling clean melting and separation without generating mechanical debris or causing collateral damage to surrounding structures.
3Ease of operation
If laser cutting is applied through the fuse box, then fuse lines can be cut, but the process fails when insulation layer thickness is outside appropriate range
Solution Approach 1:
The patent replaces laser mechanical cutting with electrical melting. The laser method requires precise focus and appropriate insulation thickness to effectively transmit and contain the cutting energy. In contrast, the electrical melting method applies current directly to the fuse line material, which melts at a specific temperature regardless of the overlying insulation layer thickness, thereby ensuring reliable operation across varying insulation dimensions.
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 approach enhances the reliability and yield of semiconductor devices by allowing for more precise and effective repair of defective cells without causing damage to adjacent fuse lines, improving the overall performance and efficiency of the semiconductor memory device.
Implementation Method 1
a laser is applied to the fuse lines 11 through the fuse box 13 after forming the fuse part to cut the fuse lines 11
Implementation Method 2
a laser is applied to the fuse lines 11 through the fuse box 13 after forming the fuse part to cut the fuse lines 11
Data Source
AI summary
A fuse part in a semiconductor device has a plurality of fuse lines extended along a first direction with a given width along a second direction. The fuse part includes a first conductive pattern having a space part formed in a fuse line region over a substrate, wherein portions of the first conductive pattern are spaced apart by the space part along the first direction. The fuse part includes a first insulation pattern formed over the space part, the first insulation pattern having a width smaller than a width of the first conductive pattern along the second direction and a thickness greater than a thickness of the first conductive pattern, and a second conductive pattern formed over the first insulation pattern, the second conductive pattern having a width greater than the width of the first insulation pattern along the second direction.