Semiconductor Device Silicon Nodule Segregation Control
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Solution Overview
Problem
In semiconductor devices with an aluminum layer on a silicon layer, silicon nodules segregate during heat treatment, causing increased electrical resistance due to their random distribution, which existing techniques struggle to control effectively.
Innovation Solution
A semiconductor device structure featuring an insulation film with strategically designed nodule segregated portions that concentrate silicon nodules at specific corners, allowing controlled segregation and reducing resistance by positioning nodules locally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicon is added to the aluminum layer to suppress alloy spikes, then alloy spike formation is reduced, but silicon segregates as nodules on the silicon layer surface increasing electrical resistance
Solution Approach 1:
The insulation film is designed with localized protruding portions that create specific corner regions where silicon nodules are intended to segregate. This local structural modification allows controlled nodule formation in predetermined positions rather than random distribution, addressing the position control issue while maintaining alloy spike suppression benefits
Solution Approach 2:
The protruding portions are pre-formed in the insulation film before aluminum layer deposition and heat treatment. This preliminary structural preparation ensures that during subsequent heating, silicon will segregate to these predetermined corner locations rather than forming nodules in random positions
2Reliability
If silicon nodules are segregated in scattered positions, then alloy spikes are suppressed, but nodules may be segregated in unexpected positions increasing resistance
Solution Approach 1:
The protruding portions of the insulation film create localized corner regions with specific geometric characteristics that guide silicon nodule segregation to predetermined positions. This local structural feature ensures nodules form only in expected locations rather than scattered positions, improving position predictability
3Reliability
If nodules are segregated on the silicon layer surface, then alloy spikes are suppressed, but current conduction is hindered increasing electrical resistance
Solution Approach 1:
The protruding portions are strategically positioned in regions where nodule segregation will not interfere with current conduction paths. By controlling the spatial location of nodules through the insulation film structure, the design maintains electrical performance while achieving alloy spike suppression
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 controlled segregation of silicon nodules at corners in the insulation film effectively reduces electrical resistance and suppresses parasitic elements, improving the operational efficiency of semiconductor devices.
Implementation Method 1
silicon contained in the aluminum layer is segregated as nodules (small masses of silicon) when the aluminum layer is heated
Data Source
AI summary
A semiconductor device is provided with a silicon layer, an upper surface side aluminum layer containing silicon and an insulation film. The upper surface side aluminum layer contacts and is layered on a part of a surface of the silicon layer. The insulation film contacts and is layered on another part of the surface of the silicon layer. The insulation film is adjacent to and contacts the upper surface side aluminum layer. The insulation film includes an insulation film body and a plurality of first nodule segregated portions projecting from the insulation film body toward the upper surface side aluminum layer as seen along a vertical direction relative to the surface of the silicon layer. A corner is formed by a side surface of the insulation film body and a side surface of each of the first nodule segregated portions as seen along the vertical direction.