Device Engineer
Engineers who design the structure of transistors and other devices, measure and evaluate the electrical characteristics of prototypes, and turn them into models for circuit design.
What the job involves
Device engineers shape the structure and characteristics of transistors and other devices so they deliver the intended performance. They set targets for threshold voltage, on-current, leakage current and so on, and work out how the dopant profiles and gate structure should change to meet them. On prototype wafers they measure current-voltage and capacitance characteristics and investigate gaps from the targets and the sources of variation. During development they may also use TCAD (process and device simulation) to predict characteristics before building anything. The measured characteristics are condensed into SPICE models that are handed to circuit designers.
Who they work with and what they handle
Because device structure is set by the process, they work closely with integration engineers, who own the overall flow, and with process engineers. They also exchange information with circuit designers who use the models and with reliability engineers who study long-term degradation. What they handle: evaluation patterns built on the wafer (test structures, often called TEGs in Japan and test keys in Taiwan), probers and instruments that contact and measure them, measurement data and simulation results. The devices they work on vary by company, from logic and memory transistors to power semiconductors, sensors and compound semiconductors.
Knowledge and skills
The foundation is semiconductor physics, PN junctions and how a MOSFET works. You should be able to explain mobility, depletion layers, short-channel effects and the like with both equations and diagrams. Electrical characterization requires not only knowing the instruments but also spotting parasitic resistance and capacitance and measurement errors. Programming helps with modeling and data handling, and if you use TCAD, the ability to interpret its results physically is important. Process knowledge lets you link a change in characteristics to a change in structure, and knowing how circuit designers use the models helps you judge how accurate they need to be.
Where to start
Start with the “Understanding devices” course and build the basics in order: “Semiconductor physics”, “PN junctions and diodes”, then “MOSFET”. If you will work on scaled transistors, “Advanced transistors (FinFET and GAA)” covers the structures used to suppress short-channel effects. Device degradation is in “Reliability”, and if you will handle power applications, “Power semiconductors” is useful. Evaluation methods are also covered in “Metrology and analysis”. As you work through the questions in each field, check whether you can explain terms such as threshold voltage and mobility in your own words.
Fields to learn
MOSFET 50 questions Advanced transistors (FinFET and GAA) 54 questions Semiconductor physics 50 questions PN junctions and diodes 50 questions Reliability 51 questions Metrology and analysis 50 questions Power semiconductors 50 questions
10 starter questions for this role
Ten basic questions from the fields this role uses
Recommended courses
Key terms
Threshold voltage Mobility Short-channel effect Subthreshold swing DIBL Transconductance High-k / metal gate EOT (equivalent oxide thickness) FinFET SPICE PDK (process design kit) DTCO (design-technology co-optimization)
FAQ
Can I become a device engineer without a science or engineering background?
This role often demands strong specialist knowledge of semiconductor physics and electronics. In general, people who studied electrical engineering, physics or materials are the usual candidates, and going straight in from a non-technical background is not easy. Hiring requirements do differ by company and change over time, though, and building experience in a related role first and moving over later is a possible path.
How is it different from a circuit designer?
Device engineers shape the structure and characteristics of individual transistors and capture those characteristics in models. Circuit designers use those models to combine transistors into circuits with the functions they need. Because device performance drives circuit performance, the two discuss characteristic targets and model accuracy as they work.
Do I need any license or certification?
In general, no specific license or certification is required. What counts is understanding how semiconductor devices work and experience with measurement and simulation. As a student, measuring device characteristics or running simulations in classes or research is good preparation that is close to the actual work.