Bonded Semiconductor Structure With Etch Stop Layer for 3D Integration
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Solution Overview
Problem
The semiconductor industry faces challenges in increasing integration density and performance due to physical limitations in lithography processes, inter-device interference, and increased circuit RC delay and power consumption as device dimensions shrink.
Innovation Solution
A semiconductor structure with a first substrate, a second substrate bonded by a first etch stop layer and a bonding layer, where the etch stop layer has high selectivity against the bonding layer, allowing precise etching and fabrication of devices on both sides of the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fabrication processes are used with through-substrate vias to connect devices, then integration density can be improved, but manufacturing complexity and difficulty increase significantly
Solution Approach 1:
The substrate is divided into two separate substrates bonded together, with devices fabricated on opposite sides. This segmentation eliminates the need for through-substrate vias and complex multi-step fabrication processes, while achieving higher integration density through 3D stacking of device layers.
Solution Approach 2:
The invention transitions from planar 2D integration to 3D vertical integration by bonding two substrates together. Devices are stacked vertically across the bonded interface, enabling higher integration density without increasing lateral footprint or manufacturing process complexity.
2Productivity
If feature size is reduced to increase integration density, then more devices can be integrated, but inter-device interference increases and device performance deteriorates
Solution Approach 1:
By moving to 3D vertical stacking, the invention increases the spacing between devices in the vertical dimension while maintaining high integration density through lateral packing. This additional spatial dimension reduces inter-device interference and maintains device performance despite high integration density.
3Productivity
If more devices are put into one chip to increase integration density, then circuit RC delay and power consumption increase
Solution Approach 1:
The 3D stacked architecture reduces interconnection lengths by allowing vertical connections through the bonded substrate interface. This reduces both RC delay and power consumption compared to lateral interconnections in conventional 2D integration, even as integration density increases.
Data Source
AI summary
The present disclosure relates to semiconductor structures, methods for making the same, and methods using the same. The semiconductor structure comprises a first substrate, a second substrate on the first substrate, a first bonding layer between the first substrate and the second substrate, a first etch stop layer between the first bonding layer and the second substrate, and the first etch stop layer has high etch selectivity against the first bonding layer. In particular, some embodiments of the present disclosure relate to semiconductor structures with etch stop layer, methods for making the same, and methods using the same.