Job Description

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.

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.

Benefits

Pension scheme Private medical & dental insurance 28 days' holiday + bank holidays Free onsite meals Onsite gym Relocation support Visa support available

About Plessey Semiconductors

Plessey has a long history of innovation. Founded in 1956, we have evolved from one of Europe's earliest semiconductor pioneers into the world's most advanced MicroLED specialist. Over the decades, Plessey has built a first class, fully integrated platform designing, manufacturing, and engineering next-generation display technologies entirely in-house. This end to end capability, combined with our strong IP portfolio, uniquely positions us to lead the scaling of MicroLEDs from lab innovation to high-volume production.

Our future is even brighter. We believe MicroLEDs will define the next era of technology--powering ultra-efficient AR/VR displays, driving optical processors that make AI faster and more sustainable, and enabling devices yet to be imagined. With our unique expertise and talented team, we are positioned to lead this transformation.

It's an exciting time to join us: Plessey has recently been acquired by Haylo Labs, accelerating our growth and opening new opportunities.Innovation Collaboration Commitment * Care