3D Integrated Chip Assembly Thermal Dissipation via Flip-Chip Bonding
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Solution Overview
Problem
High-power microelectromechanical systems (MEMS) devices face limitations in thermal dissipation and current handling due to inadequate heat dissipation paths and contamination issues, leading to performance degradation and device failure.
Innovation Solution
A 3D integrated chip assembly with flip chip bonding, a cap layer, and a hermetic seal, along with thermal interface materials and heat spreaders, provides multiple heat dissipation paths and protects against contaminants, enhancing thermal management and current carrying capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wirebonding is used to interconnect MEMS devices, then the device can be manufactured with standard processes, but the current handling capability and thermal dissipation are severely limited
Solution Approach 1:
The patent transitions from 2D wirebonding to 3D flip-chip bonding with through-substrate vias (TSVs), enabling vertical current paths through the substrate. This dimensional change allows multiple current paths and significantly increases current handling capability while maintaining manufacturability through established TSV fabrication processes
Solution Approach 2:
The patent combines electrical interconnection (flip-chip bonding) with thermal management (heat spreaders, thermal vias) and mechanical support (substrate structure) into a single integrated package. This merging of functions allows the interconnection structure to simultaneously handle high currents, dissipate heat, and provide mechanical stability
2Ease of manufacture
If wirebonding or ribbon bonding is used for interconnection, then the manufacturing process is simpler, but the thermal dissipation path is insufficient leading to performance degradation
Solution Approach 1:
The patent introduces vertical thermal paths through TSVs and heat spreaders positioned beneath the substrate, creating 3D thermal management. This eliminates reliance on surface-level wirebonding thermal paths and provides efficient heat evacuation from the device through multiple vertical conduits
Solution Approach 2:
The patent introduces heat spreaders as intermediary thermal management components between the heat-generating device and the substrate. These heat spreaders act as thermal mediators that collect heat from the device and distribute it across the substrate through TSVs, significantly improving thermal dissipation
3Device complexity
If the device operates in an open environment, then the structure is simpler, but contaminants cause sticking, contamination, or interference of metal contacts leading to device failure
Solution Approach 1:
The patent implements a nested hermetic seal structure where a cap layer is bonded to the substrate, creating an enclosed cavity that houses the device. This nested configuration protects the device from environmental contaminants while maintaining a compact form factor
Solution Approach 2:
The hermetic seal creates an inert, controlled environment inside the package, isolating the device from external contaminants such as moisture, oxygen, and particulates. This inert atmosphere prevents oxidation, corrosion, and contamination of sensitive components
4Temperature
If multiple heat dissipation paths are added to improve thermal management, then the thermal dissipation increases, but the device complexity increases
Solution Approach 1:
The patent designs TSVs to serve dual functions: electrical interconnection between layers and thermal conduction paths. The flip-chip bonding structure similarly provides both electrical connection and mechanical support. This multi-functionality reduces the need for separate dedicated thermal management components
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 solution effectively increases thermal dissipation and current handling, reducing electrical resistance and preventing contamination, resulting in a more reliable and high-performance MEMS device.
Implementation Method 1
a hermetic seal formed about the active device, the hermetic seal at least partially defined by the device substrate and the cap layer
Implementation Method 2
a plurality of heat dissipation paths extend through the three-dimensional (3D) integrated chip assembly to dissipate heat generated therein
Implementation Method 3
a heat spreader positioned proximate the three-dimensional (3D) integrated chip assembly via a thermal interface material (TIM)
Data Source
AI summary
A method of fabricating a microelectronic device structure including increased thermal dissipation capabilities. The structure including a three-dimensional (3D) integrated chip assembly that is flip chip bonded to a substrate. The chip assembly including a device substrate including an active device disposed thereon. A cap layer is physically bonded to the device substrate to at least partially define a hermetic seal about the active device. The microelectronic device structure provides a plurality of heat dissipation paths therethrough to dissipate heat generated therein.