Plessey Semiconductors
Senior Process Engineer
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Senior Process Engineer Department: Engineering Employment Type: Full Time Location: Plymouth
Description We are seeking a Senior Process Engineer – Wet Etch or Dry Etch to develop, optimise, and sustain etching processes for MicroLED device fabrication. This role will support high-resolution pixel patterning, mesa isolation, sidewall profile control, and defect reduction across III-V semiconductor materials.
Key Responsibilities Develop and optimise wet etch and/or dry etch processes for MicroLED fabrication. Define etch recipes for IIIV materials. Optimise critical parameters including etch rate, selectivity, anisotropy, sidewall angle, surface roughness, and uniformity. Support pixel scaling while maintaining yield and device performance. Perform process qualification, tool matching, and SPC control. Troubleshoot process excursions, defects, and yield loss related to etch steps. Analyse etch results using SEM, AFM, profilometry, ellipsometry, and optical inspection. Conduct DOE experiments to improve process robustness and manufacturability. Drive defect reduction initiatives related to etch damage, residues, and sidewall passivation. Work closely with lithography, epitaxy, CMP & integration engineers, support engineering teams with etch-related design feedback.
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Skills, Knowledge and Expertise Bachelor’s or Master’s degree in Materials Science, Electrical Engineering, Chemical Engineering, Physics, or a related field. 3+ years of hands-on experience in wet etch and/or dry etch process engineering (semiconductor or display industry). Strong understanding of plasma etching physics and/or wet chemical etch mechanisms. Direct experience with MicroLED or LED fabrication and/or IIIV materials would be an advantage.
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