Since the beginning of the semiconductor industry, improving the rate of yield learning has been a critical factor in the success silicon manufacturing. Each fab has dedicated yield teams that look at the yield of wafers manufactured the previous day and attempt to find the root cause of any unexpected “excursions.” In earlier… Read More
Always in motion is the future. ~Yoda
For nearly ten years now, full-chip simulation engines have successfully used process models to perform OPC in production. New full-chip models were regularly introduced as patterning processes evolved to span immersion exposure, bilayer resists, phase shift masking, pixelated illumination… Read More
Will Rogers said that an economist’s guess is liable to be as good as anyone’s, but with advanced-node optical lithography, I might have to disagree. Unlike the fickle economy, the distorting effects of the mask and lithographic system are ruled by physics, and so can be modeled.
In this installment, I’ll talk about two critical… Read More
In part I of this series, we looked at the history of lithography process models, starting in 1976. Some technologies born in that era, like the Concorde and the space shuttle, came to the end of their roads. Others did indeed grow and develop, such as the technologies for mobile computing and home entertainment. And lithography … Read More
For a brief time in the 1990s, when 4X magnification steppers suddenly made mask features 4X larger, there was a period in the industry referred to as the “mask vendor’s holiday.” The party ended before it got started with the arrival of sub-wavelength lithography, and we all trudged back to the OPC/RET mines. Since then, the demands… Read More
Thirty five years ago, in 1976, the Concorde cut transatlantic flying time to 3.5 hrs, Apple was formed, NASA unveiled the first space shuttle, the VHS vs Betamax wars started, and Barry Manilow’s I Write the Songs saturated the airwaves. Each of those advances, except perhaps Barry Manilow, was the result of the first modern-era,… Read More
