Backside MIM Capacitor Layout for Space-Saving RF Routing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing semiconductor devices face challenges in optimizing space utilization and efficient wire routing for MIM capacitors, which are crucial components in RF and analog circuits.
Innovation Solution
The integration of a backside MIM capacitor with a frontside source/drain contact structure as a top electrode and a backside metal layer as a bottom electrode, allowing for space-saving and efficient wire routing by positioning the MIM capacitor on the backside of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If MIM capacitor is placed on the frontside of the device, then it can be easily connected to frontside circuits, but it occupies valuable frontside space and complicates wire routing
Solution Approach 1:
The patent applies dimensionality change by moving the MIM capacitor from the conventional frontside (2D plane) to the backside of the device, utilizing the third dimension (vertical stacking) and the unused backside area. This spatial reconfiguration reduces frontside footprint and simplifies wire routing by placing the capacitor closer to its connection points through the source/drain regions.
2Area of stationary object
If MIM capacitor is placed on the backside of the device, then space is saved on the frontside and wire routing is simplified, but additional processing steps are required
Solution Approach 1:
The patent employs preliminary action by forming the backside MIM capacitor structure during the frontend processing steps, specifically utilizing the source/drain regions that are already being formed. The capacitor electrodes are deposited and patterned in conjunction with the transistor source/drain formation, allowing the backside capacitor structure to be prepared in advance before the wafer is flipped for backend processing.
3Ease of manufacture
If frontside source/drain contact structure is used as top electrode for backside MIM capacitor, then manufacturing steps are reduced, but direct contact through source/drain region is required
Solution Approach 1:
The patent applies merging by combining the frontside source/drain contact structure with the backside MIM capacitor top electrode into a single integrated structure. The same metal layer and contact formation process serves dual purposes: creating the source/drain contact on the frontside and forming the capacitor electrode on the backside, thereby eliminating redundant manufacturing steps and reducing overall process complexity.
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 configuration enables space-saving and efficient wire routing, enhancing the performance of semiconductor devices by optimizing the layout and reducing the footprint of MIM capacitors.
Implementation Method 1
a first (i.e., upper) metal layer, a capacitor dielectric layer, and a second (i.e., lower) metal layer
Implementation Method 2
These metal layers are separated by a thin dielectric (insulator) layer
Data Source
AI summary
A semiconductor device is provided that includes a backside metal-insulator-metal (MIM) capacitor including a first (i.e., upper) metal layer, a capacitor dielectric layer, and a second (i.e., lower) metal layer. The semiconductor device further includes a frontside source/drain contact structure as a top electrode, and the second metal layer as a bottom electrode. The top electrode can contact the backside MIM capacitor through a source/drain region of at least one transistor, or the top electrode can directly contact the backside MIM capacitor.