Photomask Process Engineer — Yield & Cleanroom Expert

Toppan Photomasks Round Rock; Round Rock (TX); On-site; USD 95,000 - 140,000; Full time

Job summary

Toppan Photomasks Round Rock is seeking a Semiconductor Engineer with 3+ years in semiconductor cleanrooms to drive process execution, optimization, and yield improvements for photomask fabrication. You will lead contamination investigations, develop cleaning chemistries, and own SPC and process documentation across multiple toolsets.

The role requires hands-on experience with core fab processes, strong analytical skills, and the ability to mentor junior engineers in a fast-paced manufacturing

Qualifications

• Bachelor's degree in Mechanical Engineering, Materials Science, Chemical Engineering, Physics.
• At least 3 years of experience in a semiconductor cleanroom or wafer fab.
• Hands-on experience with core fab process areas (cleans, lithography, etch, deposition, CMP, diffusion, or metrology).
• Experience using SPC and statistical analysis to troubleshoot process performance.
• Ability to develop and maintain process documentation and operating procedures.
• Strong cross-functional collaboration and communication skills.

Responsibilities

• Develop, optimize, and sustain photomask cleaning processes to meet customer specs and manufacturing quality.
• Own and improve post-process cleaning operations including resist strip, wet cleaning, megasonic cleaning, UV/Ozone cleaning, and contamination removal.
• Monitor and improve key process metrics including defect density, particle performance, yield, cycle time, and tool utilization.
• Perform process characterization, troubleshooting, and root cause analysis to improve yield and reliability.
• Lead root cause investigations for contamination events, particle excursions, haze formation, cleaning defects, and yield losses.
• Establish and maintain SPC systems and process control plans for stable manufacturing performance.
• Define, qualify, and release new cleaning chemistries, process recipes, and operating parameters.
• Lead qualification and acceptance for new cleaning equipment, upgrades, and process modifications.
• Develop and maintain process documentation including specifications, FMEAs, SOPs, work instructions, and control plans.
• Train and mentor technicians, operators, and junior engineers on cleaning processes and troubleshooting techniques.

Skills

Analytical skills

Problem-solving

Project management

Technical communication

Education

Bachelor's degree in Mechanical Engineering, Materials Science, Chemical Engineering, Physics

Tools

JMP

Excel

Python

SQL

Job description

Toppan Photomasks Round Rock is seeking a Semiconductor Engineer with 3+ years in semiconductor cleanrooms to drive process execution, optimization, and yield improvements for photomask fabrication. You will lead contamination investigations, develop cleaning chemistries, and own SPC and process documentation across multiple toolsets.

The role requires hands-on experience with core fab processes, strong analytical skills, and the ability to mentor junior engineers in a fast-paced manufacturing