U-Shaped Polysilicon Resistor for Precision Integration
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Solution Overview
Problem
The miniaturization of integrated circuits has increased the precision requirements for resistor manufacturing, which existing materials and processes have not adequately met, especially in maintaining high precision while facilitating mass production.
Innovation Solution
A semiconductor device is developed with a U-shaped resistor structure formed using a polysilicon material, where a second dielectric layer lines the resistor and a metal layer is deposited within the resistor, allowing for precise resistance values and easy integration into current manufacturing processes with minimal additional masking steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional resistor manufacturing processes are used, then ease of manufacture is maintained, but manufacturing precision deteriorates due to inability to meet precision requirements for miniaturized circuits
Solution Approach 1:
The patent merges the resistor formation process with the existing dual metal gate process by using the same polysilicon material and deposition techniques. The U-shaped resistor structure is formed concurrently with the metal gate structures, eliminating the need for separate resistor manufacturing steps and achieving high precision without additional process complexity
Solution Approach 2:
The patent changes the geometric parameters of the resistor structure by forming a U-shape configuration with specific width and depth dimensions. This geometric parameter optimization enables precise control of resistance values while using standard manufacturing processes, resolving the contradiction between precision and ease of manufacture
2Area of moving object
If integrated circuits are miniaturized, then device density is improved, but manufacturing precision deteriorates due to increased precision requirements that existing processes cannot meet
Solution Approach 1:
The patent applies local quality by creating a U-shaped resistor structure with specific geometric characteristics (width, depth, and curvature) that are optimized for precise resistance control. This localized geometric optimization enables high precision resistor values in miniaturized circuits without compromising overall device density
Solution Approach 2:
The patent uses polysilicon material with controlled doping to create the U-shaped resistor structure. The composite nature of doped polysilicon combined with the U-shaped geometry enables precise resistance values in miniaturized devices, achieving both high density and high precision
3Manufacturing precision
If new materials and processes are developed to meet precision requirements, then manufacturing precision is improved, but device complexity increases due to additional masking steps
Solution Approach 1:
The patent makes the polysilicon deposition and patterning process universal by using it for both metal gate formation and U-shaped resistor creation. This multi-functionality eliminates the need for separate resistor-specific materials and processes, achieving high precision without increasing device complexity
Solution Approach 2:
The patent performs preliminary action by forming the U-shaped resistor structure concurrently with the metal gate structures using the same polysilicon layer. This preliminary formation of resistors during the gate fabrication process eliminates additional masking steps and reduces overall process complexity while maintaining high precision
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 U-shaped resistor design meets the precision needs for advanced process nodes like 20 nm, achieving desired sheet resistance values while simplifying integration and reducing manufacturing costs by incorporating into existing dual metal gate processes.
Implementation Method 1
a precise amount of dopants may be introduced into a resistor that is made from a material such as polysilicon
Implementation Method 2
a metal layer is deposited within the resistor
Data Source
AI summary
A system and method for forming a resistor system is provided. An embodiment comprises a resistor formed in a U-shape. The resistor may comprise multiple layers of conductive materials, with a dielectric layer filling the remainder of the U-shape. The resistor may be integrated with a dual metal gate manufacturing process or may be integrated with multiple types of resistors.