Decoupling Capacitor Doping Structure for Lower Gate Leakage
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Solution Overview
Problem
As technology nodes shrink, the size reduction of decoupling capacitors in integrated circuits (ICs) leads to processing concerns and manufacturing yield issues due to reliability risks and increased power consumption, particularly with high gate leakage, which complicates the design and production of ICs.
Innovation Solution
The structure of PMOS and NMOS decoupling capacitors with a channel region having the same dopant type as the source/drain regions or a lightly doped drain region, minimizing size while maximizing power efficiency and manufacturing yield, reduces leakage current and increases capacitance, thereby addressing the challenges of shrinking technology nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the size of decoupling capacitors is reduced to accommodate shrinking technology nodes, then the capacitance density increases, but manufacturing yield decreases and reliability risks increase due to processing concerns
Solution Approach 1:
The patent applies local quality by creating a lightly doped drain region with specific dopant concentration gradients in localized areas of the capacitor structure. This regional doping variation optimizes the electrical properties at critical interfaces, reducing leakage current and improving reliability without requiring overall size reduction that would compromise manufacturing yield
Solution Approach 2:
The patent changes physical parameters by adjusting dopant concentration, doping depth, and thermal processing conditions to create optimal electrical characteristics. By modifying these parameters in the doped regions, the capacitor achieves reduced leakage and improved reliability while maintaining manufacturability at scaled dimensions
2Area of moving object
If the size of decoupling capacitors is reduced, then the area occupied decreases, but power consumption increases due to high gate leakage
Solution Approach 1:
The lightly doped drain region creates localized quality variations that reduce gate leakage current by optimizing the doping profile at the channel-drain interface. This local optimization reduces parasitic leakage paths, thereby decreasing power consumption without requiring increased capacitor area
Solution Approach 2:
The patent employs composite doping structures combining heavily doped source/drain regions with lightly doped drain regions. This composite approach creates beneficial electrical characteristics that suppress leakage current while maintaining compact dimensions, effectively reducing power consumption in scaled capacitor designs
3Object-generated harmful factors
If the dopant concentration in the channel region is increased, then the leakage current decreases, but the manufacturing precision requirements increase
Solution Approach 1:
The patent implements local quality by creating a lightly doped drain region with controlled dopant concentration gradients rather than uniform high doping throughout. This localized approach reduces leakage current while avoiding the need for extremely precise uniform dopant distribution, thereby reducing manufacturing precision requirements
Solution Approach 2:
The patent applies preliminary action through selective doping sequences where the lightly doped drain region is formed before final source/drain doping. This preliminary doping structure prepares the electrical characteristics to reduce leakage while providing a tolerance buffer for subsequent manufacturing variations in dopant concentration
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 reduced size and increased capacitance for decoupling capacitors, lower manufacturing costs, and improved power efficiency, with leakage current reduced by about 10% compared to similar-sized inversion bias decoupling capacitors, enhancing overall IC performance and reducing the risk of manufacturing errors.
Implementation Method 1
implanting a first dopant into a substrate to form a plurality of source/drain regions and implanting a second dopant into the substrate to define a channel region
Data Source
AI summary
A method includes implanting a first dopant having a first dopant type into a substrate to define a plurality of source/drain (S/D) regions. The method further includes implanting a second dopant having the first dopant type into the substrate to define a channel region between adjacent S/D regions of the plurality of S/D regions, wherein a dopant concentration of the second dopant in the channel region is less than half of a dopant concentration of the first dopant in each of the plurality of S/D regions. The method further includes forming a gate stack over the channel region. The method further includes electrically coupling each of the plurality of S/D regions together.