Heated Showerhead CVD for CESL Adhesion and Defect Reduction
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Solution Overview
Problem
Current semiconductor device manufacturing techniques face challenges in enhancing carrier mobility and device current performance, particularly in reducing defects and improving adhesion of the contact etch stop layer (CESL) to enhance stress distribution and device performance.
Innovation Solution
A method involving a chemical vapor deposition (CVD) process with plasma treatment using nitrous oxide (N2O) plasma to form a tensile-contact CESL, which provides tensile stress in the channel regions and improves adhesion by heating the precursor gases to a temperature range of 70° C. to 100° C., reducing defect formation and increasing device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional CVD process is used to deposit CESL, then deposition can be performed, but defects are formed and adhesion is poor
Solution Approach 1:
The patent applies parameter changes by heating the showerhead to temperatures between 70°C to 100°C, which modifies the physical state of precursor gases and enhances the deposition process. This temperature parameter change improves both adhesion and reduces defect formation in the CESL layer.
Solution Approach 2:
The heated showerhead acts as an intermediary that transfers thermal energy to precursor gases, creating optimized deposition conditions. This intermediary mechanism enables better control over the deposition process, resulting in improved adhesion and reduced defects.
2Strength
If CESL is deposited without precursor gas heating, then deposition can be performed, but adhesion is poor
Solution Approach 1:
The patent implements parameter changes by introducing controlled heating of the showerhead to specific temperature ranges (70°C to 100°C). This parameter modification enhances adhesion strength without significantly complicating the manufacturing process, as the heating is integrated into the existing CVD system.
3Reliability
If lattice spacing mismatch is utilized to create stress, then carrier mobility is enhanced, but in-plane stress distribution may be uneven
Solution Approach 1:
The patent applies local quality by creating uniform stress distribution through controlled deposition conditions. By heating the showerhead and optimizing precursor gas delivery, the process ensures consistent lattice spacing matching across the entire CESL layer, resulting in uniform in-plane stress that enhances carrier mobility throughout the device.
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 plasma treatment significantly reduces defects and enhances the adhesion of the CESL, leading to improved carrier mobility and device current performance by minimizing nucleation sites and ensuring strong bonding between the CESL and the substrate.
Implementation Method 1
A method involving a chemical vapor deposition (CVD) process with plasma treatment using nitrous oxide (N2O) plasma
Implementation Method 2
improves adhesion by heating the precursor gases to a temperature range of 70° C. to 100° C.
Implementation Method 3
A method involving a chemical vapor deposition (CVD) process
Implementation Method 4
When such a contact etch stop layer is deposited, due to the lattice spacing mismatch between the CESL and the underlying layer, an in-plane stress develops to match the lattice spacing
Data Source
AI summary
A method for manufacturing a semiconductor device includes introducing a gas into a chamber from a showerhead. The chamber has a sidewall surrounding a pedestal. The temperature of the showerhead is increased. The showerhead is thermally connected to the sidewall of the chamber, and a temperature of the sidewall of the chamber is increased by increasing the temperature of the showerhead.