Semiconductor Substrate Bonding via Metallic Alloy Formation
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Solution Overview
Problem
In semiconductor apparatus fabrication, achieving a low-contact-resistance bond between bonded substrates is challenging due to high-contact-resistance materials generated at the interface, leading to instability and potential failure of the semiconductor apparatus.
Innovation Solution
A method involving a first silicon substrate with a silicide layer between the substrate and a first metal layer, and a second silicon substrate with a second metal layer, where the first and second metal layers are heated to form a metallic alloy, bonding the substrates together.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If substrate bonding is performed using conventional methods, then substrates can be bonded together, but high-contact-resistance materials are generated at the interface, resulting in high contact resistance and potential apparatus failure
Solution Approach 1:
A metallic alloy layer is introduced as an intermediary between the first metal layer of the first contact and the second metal layer of the second contact. This alloy layer, formed by heating the metal layers to a temperature between 200°C and 500°C, serves as a mediator that reduces contact resistance at the bonding interface while maintaining bond stability.
Solution Approach 2:
The physical and chemical parameters of the metal layers are changed by heating them to a specific temperature range (200°C-500°C) during the bonding process. This temperature treatment transforms the metal layers into a metallic alloy with improved electrical properties, specifically lower contact resistance, while maintaining mechanical bonding strength.
2Reliability
If heating is applied to form metallic alloy, then contact resistance is reduced and bond stability is improved, but additional process steps and energy consumption are required
Solution Approach 1:
The bonding process utilizes moderate temperature heating (200°C-500°C) to induce metallurgical bonding and form the metallic alloy layer. This temperature range is sufficient to reduce contact resistance and improve bond stability while avoiding excessive energy consumption that would occur at much higher temperatures.
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 results in a low-contact-resistance bond that enhances the stability and performance of the semiconductor apparatus by forming a metallic alloy that provides both mechanical support and electrical connectivity between the substrates.
Implementation Method 1
heating the first and second metal layers to form a metallic alloy, whereby the metallic alloy bonds the first contact to the second contact
Implementation Method 2
heating the first and second metal layers to form a metallic alloy, whereby the metallic alloy bonds the first contact to the second contact
Implementation Method 3
a first contact comprising a silicide layer between the substrate and a first metal layer
Data Source
AI summary
A method for fabricating a semiconductor apparatus including providing a first silicon substrate having a first contact, wherein providing the first silicon substrate comprises forming a silicide layer between the first silicon substrate and a first metal layer. The method further includes providing a second silicon substrate having a second contact comprising a second metal layer and placing the first contact in contact with the second contact. The method further includes heating the first and second metal layers to form a metallic alloy, whereby the metallic alloy bonds the first contact to the second contact.