Understanding Plasma Sputtering: A Brief Overview

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    Plasma Sputtering
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Discussion Overview

The discussion revolves around the process of plasma sputtering, particularly in the context of nanophysics and thin-film fabrication. Participants explore the definition, mechanisms, and implications of the technique, as well as its applications in producing monolayers of atoms.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Homework-related

Main Points Raised

  • One participant seeks clarification on plasma sputtering for an upcoming exam, indicating a lack of resources on the topic.
  • Another participant suggests a collaborative approach to understanding by splitting the explanation of plasma and plasma sputtering.
  • A participant describes plasma sputtering as a method for producing monolayers of atoms, involving a cathode and anode, where ions bombard the cathode to eject atoms.
  • Concerns are raised about the controllability of the sputtering process for producing monolayers without chemical precursors, questioning the effectiveness of the technique.
  • Another participant compares sputtering to atomic deposition and discusses the challenges of substrate mismatch in deposition processes.
  • There is a mention of the importance of substrate choice and temperature during deposition to achieve stable films and minimize internal stress.
  • One participant reflects on their earlier speculative thoughts about atom behavior during deposition, indicating a more informal, exploratory line of reasoning.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and concern regarding the effectiveness and control of plasma sputtering for producing monolayers. There is no consensus on the controllability of the process or the implications of substrate choice.

Contextual Notes

Participants highlight limitations in their understanding of the sputtering process, particularly regarding the conditions necessary for effective monolayer production and the implications of substrate properties.

Jayse_83
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What is plasma sputtering??

Hi,

I've got a undergrad exam coming up and i can't describe the process of plasma sputtering :cry: , can't find much on the web .. any help would be greatly appreciated
 
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Jayse_83,

How about if we split the work? You tell us what a plasma is, and we'll tell you what plasma sputtering is.
 
hey, thanks for the offer but i think I've figured it out now!
 
Jayse_83 said:
hey, thanks for the offer but i think I've figured it out now!
Come back here, you! Now that you've got me all curious about this, don't you dare be buggering off without telling me the answer!
 
lol! ok its for a nanophysics course and its a method of producing monolayers of atoms. The technique is quite simple, involving a cathode (this is made from the material you wish the monolayer to be made from) and an anode. The cathode is bombared from impacting ions from the anode and atoms from the cathode are 'spluttered' out ... sorry if its not in detail, but that's all i need to know !
 
Jayse_83 said:
lol! ok its for a nanophysics course and its a method of producing monolayers of atoms. The technique is quite simple, involving a cathode (this is made from the material you wish the monolayer to be made from) and an anode. The cathode is bombared from impacting ions from the anode and atoms from the cathode are 'spluttered' out ... sorry if its not in detail, but that's all i need to know !

I'm not sure if the "name has been changed to protect the innocent", but in thin-film fabrication, this technique is typically known as DC sputtering or, if a more sophisticated method is employed, an AC magnetron sputtering.

However, without using any chemical precursor to produce a natural reaction (such as that in atomic-layer deposition), I do not know how such a technique can produce monolayer of film. All you're doing is causing the sputtered atoms/molecules to be deposited onto a substrate - hardly a controllable process to produce monolayers.

Zz.
 
Jayse_83 said:
sorry if its not in detail, but that's all i need to know!
Okay, got it now. I wasn't familiar with that term. The closest thing that crossed my mind was the nasty little explosions that you occassionaly get while arc welding. The thing that you're referring to is what I've known of as 'atomic deposition'. It's like the atomic-level equivalent of the plasma coating that we use for 'painting' metallic objects, or electroplating.

ZapperZ said:
All you're doing is causing the sputtered atoms/molecules to be deposited onto a substrate - hardly a controllable process to produce monolayers.
I wonder... if the deposited atoms have a very high affinity for the substrate and a high dislike for each other, wouldn't they tend to avoid piling up?
 
Danger said:
I wonder... if the deposited atoms have a very high affinity for the substrate and a high dislike for each other, wouldn't they tend to avoid piling up?

Substrate mismatch is a BIG issue in any deposition. So your choice of substrate is crucial. For example, the common substrate such as MgO and sapphire, have a huge lattice mismatch when you try to deposite GaN. As soon as you take it out, you'll see flaking and cracking on the film.

Now I've never heard of the situation that you described. Remember that in sputtering, you are sputtering out of a solid target of the material already (unless you're doing reactive sputtering or making an alloy). So you're already starting off with a material that, presumably, has no such hatred to itself. Furthermore, the deposition is typically done at high temperatures. The substrate usually is heated to maybe 500 C. This allows the sputtered gas that landed on the substrate (and the already formed film) to have enough thermal energy to rearrange themselves into the most stable configuration. So films formed this way tend to have less internal stress and are less prone to cracking.

Zz.
 
Last edited:
ZapperZ said:
Now I've never heard of the situation that you described.
That's probably because it existed only in my head. I was just 'thinking out loud'. No school, remember?
 

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