Semiconductor Structure with Integrated Resistor and MIM Capacitor
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Solution Overview
Problem
In semiconductor integrated circuit fabrication, the formation of resistors and capacitors in the back-end of the line (BEOL) process faces challenges with parasitic capacitance and manufacturing complexity, particularly due to the need for additional masks and isolation structures to reduce unwanted capacitance and maintain high precision.
Innovation Solution
The integration of a resistor and a metal-insulator-metal (MIM) capacitor is achieved in the BEOL process using a single additional mask, where the resistor layer is formed between two metal layers, with a high-K dielectric material sandwiched between the electrodes, reducing parasitic capacitance and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional masks and isolation structures are used to reduce parasitic capacitance and maintain high precision, then measurement precision and manufacturing precision are improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The patent combines the resistor and capacitor fabrication processes into a single integrated structure within the BEOL interconnect layers. The resistor layer and capacitor electrodes share common interconnect layers and formation processes, eliminating the need for separate isolation structures and additional masks that would otherwise be required for individual resistor and capacitor fabrication. This merging maintains precision while reducing process complexity.
Solution Approach 2:
The BEOL interconnect layers serve multiple functions simultaneously: they provide electrical interconnection and also form the electrode structures for capacitors. The resistor layer serves both as a resistive element and as an electrode for the capacitor. This multi-functionality eliminates the need for dedicated isolation structures and additional processing steps, reducing device complexity while maintaining fabrication precision.
2Manufacturing precision
If traditional separate fabrication processes are used for resistors and capacitors, then manufacturing precision can be maintained, but manufacturing complexity and costs increase
Solution Approach 1:
The patent merges the fabrication of resistors and capacitors into a single integrated process flow within the BEOL. Both components are formed using the same interconnect layer deposition and patterning processes, eliminating the need for separate fabrication sequences. This integration maintains manufacturing precision through consistent process parameters while significantly simplifying the overall manufacturing procedure and reducing costs.
Solution Approach 2:
The resistor layer automatically serves as the bottom electrode for the capacitor, eliminating the need for separate electrode formation processes. The high-k dielectric material is deposited directly over the resistor layer, which is already in place, allowing the capacitor structure to be formed as part of the resistor fabrication process. This self-service approach maintains precision while reducing manufacturing complexity.
3Area of stationary object
If resistor layer is placed closer to substrate, then area is reduced, but parasitic capacitance increases
Solution Approach 1:
The patent extracts the resistor and capacitor structures from the lower interconnect layers and places them in the upper BEOL interconnect layers. This extraction removes the harmful parasitic capacitance interaction with the substrate by increasing the distance between the resistor layer and substrate. The design maintains compact area by utilizing the available space in upper interconnect layers, effectively separating the functional components from the substrate-induced parasitic effects.
Solution Approach 2:
The patent transitions the resistor and capacitor placement from the vertical dimension (close to substrate) to the lateral dimension (distributed across upper interconnect layers). By utilizing multiple upper interconnect layers for resistor and capacitor formation, the design achieves compact area through efficient lateral arrangement while maintaining sufficient vertical separation from the substrate to minimize parasitic capacitance.
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 decreases unwanted parasitic capacitance for the resistor and allows for better capacitance density in the MIM capacitor, reducing manufacturing costs and complexity while maintaining high precision.
Implementation Method 1
a high-K dielectric material sandwiched between the electrodes
Data Source
AI summary
Semiconductor structures are provided. A semiconductor structure includes a substrate, a conductive plate of a first metal layer over the substrate, a first resistor material of a resistor layer over the conductive plate, a high-K material formed between the first resistor material and the conductive plate, a first conductive line of a second metal layer over the resistor layer, and a first via formed between the first conductive line and the first resistor material. The conductive plate, the first resistor material and the high-K material form a capacitor between the first and second metal layers. The first distance between the first resistor material and the conductive plate is less than the second distance between the first resistor material and the first conductive line.