Capacitor Structure Thickness Control for BEOL Stability
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Solution Overview
Problem
The manufacturing method for capacitor structures faces challenges in controlling capacitance stability due to process variations in back end of line (BEOL) processes, making it difficult to achieve consistent capacitance values in integrated circuits (ICs).
Innovation Solution
The method involves monitoring the thickness of a second electrically conductive layer to set a target value for the thickness of a first electrically conductive layer, allowing for precise control of capacitance by adjusting the thickness of subsequent layers to compensate for deviations, thereby stabilizing the total capacitance of the capacitor structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional BEOL processes are used to form capacitor structures, then manufacturing simplicity is maintained, but capacitance stability deteriorates due to process variations
Solution Approach 1:
The patent implements a feedback control mechanism where the thickness of the second electrically conductive layer is monitored and used to adjust the target thickness of the first electrically conductive layer. This closed-loop approach compensates for process variations in BEOL processes, ensuring stable capacitance values despite manufacturing variations.
Solution Approach 2:
The patent dynamically adjusts the target thickness parameter of the first electrically conductive layer based on the actual measured thickness of the second layer. By changing this critical parameter adaptively, the system maintains capacitance stability without requiring completely new manufacturing processes.
2Manufacturing precision
If fixed target thickness values are used for electrically conductive layers, then manufacturing simplicity is maintained, but capacitance precision deteriorates due to thickness variations
Solution Approach 1:
The patent performs preliminary monitoring of the second electrically conductive layer thickness before forming the first electrically conductive layer. This advance measurement allows the target thickness of the first layer to be predetermined and adjusted accordingly, ensuring precise capacitance control before the actual deposition process begins.
Solution Approach 2:
The patent transitions from static, fixed target thickness values to dynamic, adaptive target values that change based on actual process conditions. The target thickness of the first electrically conductive layer becomes a variable parameter that adjusts in response to measured variations in the second layer, enabling precise capacitance control.
Data Source
AI summary
A manufacturing method of a capacitor structure includes the following steps. A first capacitor is formed on a substrate. The first capacitor includes a first electrically conductive pattern and a second electrically conductive pattern of a first electrically conductive layer and a first dielectric layer disposed therebetween in a horizontal direction. A second capacitor is formed on the substrate before forming the first capacitor. The second capacitor includes a third electrically conductive pattern and a fourth electrically conductive pattern of a second electrically conductive layer and a second dielectric layer disposed therebetween in the horizontal direction. A thickness of the second electrically conductive layer is monitored. A target value of a thickness of the first electrically conductive layer is controlled in accordance with a value of a monitored thickness of the second electrically conductive layer.