Imagine a scenario of being able to deposit a film of material a few atomic layers at a time. Yes, it might sound impossible; however, Atomic Layer Deposition is a reality. ALD is being used in a wide range of applications as a controllable and precise process for producing thin films. Alongside its etch counterpart, Atomic Layer Deposition allows the use of three-dimensional and new designs in advanced chip manufacturing.
This blog talks about the advantages and applications of Atomic Layer Deposition. Kindly scroll down and continue reading to learn more.
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Advantages of Atomic Layer Deposition
Atomic Layer Deposition offers some advantages, all arising from the sequential and self-timing reactions.
1. Although deposition is not a single atomic layer per cycle, there is excellent control in film thickness, and good uniformity can be accomplished across the wafer.
2. Atomic Layer Deposition creates a layer that conforms very well to the wafer topography, with matching film thicknesses deposited on the sides, bottoms, and tops of device features. This high conformity is an essential capability for 3D structures and a high-aspect-ratio.
3. Surfaces created by Atomic Layer Deposition are atomically very smooth, having excellently-controlled chemical composition
Applications of Atomic Layer Deposition
The Atomic Layer Deposition procedure can create both conducting and insulating films, depending on the preference of precursors. Its various merits have led Atomic Layer Deposition to be used in various applications. Below, we have highlighted some of them:
1. 3D NAND
The 3 D structures in three-dimensional NAND memory devices need a high control of variability. Atomic Layer Deposition is well designed for this and is utilized to form dielectric films on the sidewalls of memory holes.
Metal Atomic Layer Deposition is also used in word line fill in replacement-gate schemes. And it requires lateral deposition that fills horizontal, narrow features.
2. Self-Aligned Patterning
Atomic Layer Deposition plays a crucial role in self-aligned multiple patterning. This is used to form smaller patterns than can be made with current lithography technology. In this method, a thin spacer is deposited on predefined structures. The spacer film has to be very uniform and well conformal, as it will define the dimensions of the final pattern in the end.
3. FinFET
In finFETs, the thin gate sidewall spacers must be formed with uniform thickness and the absence of pinholes. Atomic Layer Deposition is a great way to deposit this layer, which separates the three-dimensional fin structures for the control gate.
Future Applications of ALD
The uses of Atomic Layer Deposition continue to expand. For example, Atomic Layer Deposition is being explored as a means to improve overlay control or how exactly a new pattern can be aligned over an already existing pattern.
Looking at the future, we expect Atomic Layer Deposition to play an increasingly essential role in improving semiconductor production as these applications, as well as others, develop. Established as a significant enabling technology, Atomic Layer Deposition continues to advance for use in scaling strategies and challenging new structures as they are incorporated into next-generation devices.
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