Device Physics Engineer, Solar Cells (Starlink)

SpaceX•Bastrop, TX

About The Position

SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where we are not. Today SpaceX is actively developing the technologies to make this possible, with the ultimate goal of enabling human life on Mars. DEVICE PHYSICS ENGINEER, SOLAR CELLS (STARLINK) Starlink believes in providing fast, reliable internet to those that need it most. We design, build, and launch the world's largest and most advanced satellite constellation that is capable of delivering high-speed internet to even the most remote locations. We are seeking an exceptional Device Physics Engineer to lead end-to-end cell efficiency ownership in our high-volume silicon heterojunction (SHJ) solar cell fab. Acting as the central process integration expert, you will collaborate with specialized process and equipment engineers to maximize cell performance to achieve state of the art efficiency, define wafer specifications, design space-optimized cell architectures, and establish comprehensive metrology and reliability frameworks. Your work will span from ingot growth all the way through cell production (wafer prep, deposition, passivation, metallization) and module fabrication. Your work will ensure our solar cells deliver unmatched power density and durability for Starship, Starlink, AI Satellites, and deep-space missions. You will spearhead state of the art production processes, and work through the entire life cycle of setting up a greenfield solar cell production plant, including equipment/lab procurement, plant design/layout, equipment commissioning and ramp-up, recipe and process development, and working to develop a world-class production team and environment. Your work will form the backbone of the Starlink network (photons of sunlight in is directly proportional to photons of data out to customers!) and help provide internet to tens of millions of customers all around the world.

Requirements

Bachelor’s degree in an engineering discipline
1+ years of experience in chemical engineering design, analysis, and/or system implementation (internship and extracurricular experience is applicable)

Nice To Haves

Master’s degree or Ph.D. in chemistry, chemical engineering, materials science, environmental, or other STEM discipline
Strong understanding of vacuum systems, plasma physics, sputtering dynamics, and thin-film characterization techniques (e.g., XRD, SEM, Hall effect)
5+ years of experience in solar cell physics, device modeling, or process integration in PV (SHJ, PERC, TOPCon, HJT preferred)
Deep understanding of SHJ efficiency drivers: Surface passivation, carrier selectivity, TCO optics, and space degradation mechanisms
Hands-on experience with PV metrology tools (eg. Sinton lifetime, EL/PL) and reliability testing
Proficiency in PV simulation software and statistical data analysis. Proficiency in data analysis/scripting (Python, R, SQL) and simulation tools (e.g., SIMTRA for sputtering)
Expertise in advanced SHJ topics: Poly-Si contacts, bifacial optimization, or perovskite tandems for >30% targets
Strong publication record in PV conferences/journals and experience leading multidisciplinary teams
Experience with SPC, DoE, and lean manufacturing principles
Ability to work in a cleanroom environment
Hands-on experience working with complex fluid or mechanical based production systems in a professional setting
Experience transitioning products from design to manufacturing and scaling to high volume as part of a cross-functional team
Experience with solar cell manufacturing equipment, such as wet chemical processing equipment, PE-CVD equipment, PVD machines, metallization and final test equipment, and wafer inspection equipment (experience in evaporation tools and ALD tools are a plus)
Experience with micro-structure analysis tools (SEM, TEM, EDX, SIMS, etc.) and optical/electrical characterization tools (UV-VIS, I-V, Resistance, etc.)
Experience in cost-of-ownership modeling, CapEx justification, and fab ramp-ups to multi-GW scales
Passion for sustainable energy and space technology; prior work in photovoltaics at GW-scale a plus

Responsibilities

Own end-to-end cell efficiency roadmap: integrate processes across ingot growth, wafer prep, deposition (PECVD, PVD), passivation, metallization, and testing to drive significant efficiency gains
Define and qualify incoming wafer specifications (e.g., resistivity, lifetime, thickness uniformity) for SHJ compatibility, partnering with suppliers and internal supply for tens of GW-scale volumes
Design and iterate SHJ cell architectures optimized for space: Radiation tolerance (proton/electron fluence), thermal vacuum cycling, UV exposure, and high specific power (>250 W/kg)
Develop fab-wide metrology strategy: Select, commission, and calibrate inline/offline tools (e.g., lifetime testers, IQE/EL mappers, TRPL, LBIC, SEM, Ellipsometry, Raman, etc.) for real-time process control and yield correlation
Lead reliability engineering: Establish accelerated life testing labs (HALST, damp heat, mechanical stress, radiation, TVAC, UV, etc.), define qualification protocols per ECSS/AEC-Q standards, and predict 25+ year mission lifetimes
Build and maintain physics-based models (e.g., PC1D, Quokka, Sentaurus) for loss analysis (recombination, shading, passivation) and guide DoE with process teams
Analyze production data to identify efficiency limiters, spearhead cross-functional improvements, and support fab ramps
Mentor team on PV physics fundamentals and represent solar cell performance in design reviews for spacecraft power systems
Develop, implement, and maintain new and/or improved manufacturing processes, equipment, technologies, and facilities
Analyze production processes and machinery from a first principles, physics-based approach
Develop experiments to diagnose and correct manufacturing problems, utilizing robust DOE and statistical methodologies
Optimize process conditions and materials to improve the optical and electrical quality of solar cells
Develop project plans, budgets, and cost/benefit analysis for implementation of new processes or machines
Prepare detailed content for technical design reviews
Demonstrate extreme ownership of the production outcome of the Starlink solar factory across yield, uptime, and cost
Scale lab/pilot level processes to production environments, working closely with the process engineering team