Substrate Resistor Resistance Control via Thickness Adjustment
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Solution Overview
Problem
The miniaturization of resistors in semiconductor devices leads to variations in resistance due to manufacturing processing steps, which is challenging to control effectively.
Innovation Solution
A semiconductor device structure is formed with a substrate, isolation regions, gate dielectric layers, and diffusion barrier layers, where a polysilicon layer is doped and patterned to create a resistor structure, and a filler section is removed to control resistance values, allowing for precise resistance adjustment through the thickness of the resistor material and connector formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the size of the resistor is increased to increase resistance, then the resistance value is improved, but the device size increases which opposes miniaturization
Solution Approach 1:
The patent changes the thickness parameter of the resistor material layer to control resistance values. By adjusting the thickness of the deposited resistor material (e.g., from 10nm to 100nm), the resistance can be precisely controlled without changing the planar footprint of the resistor, thus resolving the contradiction between achieving desired resistance values and maintaining miniaturized device size.
2Area of stationary object
If processing steps are used to manufacture miniaturized resistors, then device miniaturization is achieved, but variation in resistance increases
Solution Approach 1:
The patent replaces traditional mechanical processing steps (etching, patterning, doping) with a deposition-based approach. Resistor material is deposited conformally to form the resistor structure, and resistance is controlled by deposition thickness rather than by mechanical removal or doping processes. This substitution reduces variability introduced by processing steps while maintaining miniaturization.
3Ease of manufacture
If traditional resistor manufacturing methods are used, then ease of manufacture is maintained, but control over resistance values in miniaturized structures deteriorates
Solution Approach 1:
The patent maintains manufacturing simplicity by using standard deposition techniques while improving resistance control through precise thickness parameter control. The resistance value is determined by the thickness of the deposited material layer, which can be controlled with atomic-layer precision by modern deposition equipment, thus achieving both ease of manufacture and precise resistance control in miniaturized structures.
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 method enables precise control over resistance values in miniaturized resistors, reducing variations and ensuring consistent performance in semiconductor devices.
Implementation Method 1
a polysilicon layer is doped and patterned to create a resistor structure
Data Source
AI summary
A semiconductor structure can include a resistor on a substrate formed simultaneously with other devices, such as transistors. A diffusion barrier layer formed on a substrate is patterned to form a resistor and barrier layers under a transistor gate. A filler material, a first connector, and a second connector are formed on the resistor at the same manner and time as the gate of the transistor. The filler material is removed to form a resistor on a substrate.