Dummy Deep Trench Capacitor Layout for Etch Loading Control
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Solution Overview
Problem
The outermost deep trench capacitors (DTCs) in semiconductor devices experience bending and warping due to the etch loading effect, leading to variations in critical dimensions and reduced yield, which can cause unintentional cross-coupling or shorting, affecting the reliability and yield of the chips.
Innovation Solution
Incorporating dummy DTCs outside the active DTCs, which are disconnected and designed to absorb the etch loading effect, thereby reducing or eliminating bending and warping of active DTCs, and increasing the reliability and yield of the chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deep trench capacitors are formed in semiconductor devices, then capacitance function is achieved, but etch loading effect causes bending and warping of outermost DTCs
Solution Approach 1:
Dummy DTCs are formed in advance at predetermined locations outside the active DTCs to preemptively absorb the etch loading effect before it affects the active capacitors. This preliminary structural addition balances the etch process loads and prevents bending and warping of the outermost active DTCs during fabrication.
Solution Approach 2:
The dummy DTCs act as intermediary structures that mediate between the etch process and the active DTCs. By positioning these dummy structures outside the active array, they serve as buffer elements that absorb harmful etch loading effects, protecting the active capacitors from dimensional variations and structural deformation.
2Manufacturing precision
If dummy DTCs are added to absorb etch loading effect, then bending and warping of active DTCs is reduced, but device structure becomes more complex
Solution Approach 1:
The dummy DTCs are strategically positioned only at specific locations outside the active DTC array where the etch loading effect is most pronounced. This localized approach addresses the specific problem areas without unnecessarily complicating the entire device structure, maintaining manufacturing precision where it matters most while minimizing overall structural 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
The introduction of dummy DTCs mitigates the etch loading effect, maintaining the integrity of active DTCs and enhancing the overall yield and reliability of semiconductor devices by acting as a buffer against warping and bending.
Implementation Method 1
The outermost deep trench capacitors (DTCs) in semiconductor devices experience bending and warping due to the etch loading effect
Data Source
AI summary
A semiconductor device and a method of manufacturing the semiconductor device are disclosed. In one aspect, at least one active deep trench capacitor (DTC), the at least one active DTC including a plurality of conductive layers and an insulating layer disposed between adjacent conductive layers of the plurality of conductive layers. The semiconductor device includes a plurality of dummy DTCs disposed on opposing sides of the at least one active DTC, the plurality of dummy DTCs and the at least one active DTC arranged in a row. The semiconductor device includes a plurality of conductive structures connected to the plurality of conductive layers of the active DTC, the plurality of dummy DTCs insulated from the at least one active DTC.