How a CVD Diamond is Made

Arguably cooler to have a manufactured diamond, anyone can just find one, manufacturing one is way more of an achievement

Diamond is used for the window through which plasma heating energy is injected into fusion reactors like ITER. This is because diamond is incredibly transparent over a huge range of frequencies, and the thermal conductivity is required to for cooling. They're also used for windows in other vacuum applications, of course, but pushing tens of megawatts through a 180mm diameter, 2mm thickness diamond window has to be the most amazing one. of course, these diamonds are polycrystalline, but still transparent. There's also a company making 100mm wafers of monocrystalline diamonds using a unique technology where the diamond isn't grown on a seed crystal, but on a Ir/YSZ/Si wafer. AuDiaTech in Germany. Supposedly the largest monocrystalline diamonds in the world.

This is an outstanding presentation on CVD diamond. One of the first applications for large CVD diamonds, not mentioned in this video, was the manufacture of windows for aerospace applications, Diamond is transparent to light from infrared to ultraviolet wavelengths, and can be used as a protective, optical window for sensors on the front of missiles or aircraft that is the only suitable material able to withstand impact from rain at high speed.

The irony is that high quality mined diamonds aren't actually that rare but the diamond houses like DeBeers deliberately restrict the supply. Combine that with the incredible skill needed to polish high quality gemstone and that's why they're still expensive.

Given the exploitation happening in the mining industry, there should be a mature push for 'cultured' diamonds, highlighting exactly that point.

Fun fact: the high hydrogen to carbon ratio in the gas mix is for etching away the non diamond allotropes

It sounded like you momentarily dropped into a deep American Southern drawl when you said the word "violet" and I just about got whiplash

When we met in Taipei you asked what my company would do if we were approached to make diamond thin films, now I know what was on your mind!

I want one of the diamond cubes for my desk. Ideally about twice that size. No interest in them cut, but just a nice cube of diamond would be nice to have.

I prefer the term "Bloodless Diamond" to refer to these as.

As a material sciencentist seeing a video from you being released is always a good day :) Especially because I am working at pacvd and pvd Now it is required for me to watch this video to the end! 😅

1:28 LOL sense of humor just like your videos, refined like a sir

I used to run a CVD machine that created diamonds. These were for making UV photodiodes that were for measurment of energy/average power of KrF excimer lasers. The wafers were made of P type SiC then a layer of blue P type diamond then a layer of yellow N type diamond. The finished crystals were only 3x3x0.2mm. The defect rate was very high as well.😂

Shine on you crazy diamond.

i'm calling a linus tech tips video in the next 2 years showcasing a diamond heatsink

Loved this video. Brings me back to my grad school days when I used to work on diamond thin films for solvated electron generation. Another interesting thing about diamond probably most people don't know is its conduction band is actually so high in energy that it has above the energy of an electron in vacuum. As a result, if the diamond surface is properly controlled, it can have something called negative electron affinity and act as a great electron emitter assuming you can get an electron into the conduction band. This effect works not just in vacuum, but gases and liquids too and with amazing results.

I NEED the channels that have these type of vacuum chambers and magnetrons and such to try and do CVD Diamonds!

once again, a totally fantastic video.

Your channel is a gem, pun intended. Every time I watch one of your videos, I get a glimpse of what the tech industry is doing or has been doing. You do such a good job at presenting information. When you brought up the heat dissipation application of CVD diamonds and mentioned Synopsis buying Ansys for heat transfer simulations, it kinda blew my mind to see a connection like that. Not a surprising connection, but one I didn’t think about until you mentioned it.

Years ago there was talk of using diamond for semiconductors directly, which was supposed to allow for chips running at 10GHz and very hot temperatures with no ill effect.