Millisecond annealing delivers a short thermal pulse, often using flash-lamp or laser heating, to seek dopant activation and defect recovery with less time for diffusion than a longer anneal. The balance depends on the temperature history, material absorption, and device stack. Neither full activation nor zero diffusion follows automatically. The linked flow does not label an anneal as a millisecond process.
Flow Context for Millisecond Annealing
The 7nm FinFET flow overview shows junction and anneal context, but no visible label verifies a millisecond pulse. The free 40nm dopant activation step shows a related duty, not a pulse duration. Locked 7nm step details require the corresponding entitlement.
Anneal cross-sections provide context only; no shown station is verified as a millisecond pulse.
Process map
7nm FinFET
Locate junction and well anneal roles; the flow does not specify millisecond heating or a pulse duration.
Physics & Mechanism
Activation, defect recovery, and diffusion respond differently to a time-temperature history . Shorter exposure at elevated temperature may reduce diffusion while still allowing useful activation, but the actual balance needs measurement. Flash and laser methods deposit energy differently, and patterned materials can absorb light differently. Therefore a single nominal pulse does not guarantee a uniform wafer temperature or junction response.
Process Principles
Compare the full thermal history rather than only peak temperature or pulse duration. A short pulse may complement another anneal, depending on sequence. Absorption, heat flow, wafer uniformity, and the surrounding film stack all matter when interpreting the result.
Challenges & Failure Modes
Possible risks include thermal gradients, nonuniform activation, stress, and residual implant damage. Their severity is stack dependent. Metal protrusion, special dielectric phase changes, and interface clustering are not generic consequences of every millisecond anneal and are not established by the displayed steps.
From Principle to Production Flow
Where selected, a millisecond process must fit implant, activation, diffusion, optical absorption, and thermal-stress budgets. The 7nm flow overview is related context, not a verified pulse recipe. See ion implantation and rapid thermal annealing for neighboring mechanisms.
Technology Node Evolution
Tighter junction and thermal constraints can make shorter heat exposures useful, while three-dimensional geometry can make absorption and heat flow more complex. The choice of flash, laser, or longer anneal remains specific to the material stack and device target.
Related Processes
Rapid thermal annealing, laser spike annealing, and ion implantation share thermal or junction context; they are not interchangeable process labels.
References
Silicon VLSI Technology - Full
James D. Plummer, Michael D. Deal, Peter B. Griffin
Silicon VLSI Technology · ISBN 978-0130850379