Ah, inside the chip. Diamond heat spreaders outside the chip are known.[1]
Next, a diamond layer every few layers in 3D chips?
[1] https://www.alibaba.com/product-detail/Thermal-Management-Gr...
Next, a diamond layer every few layers in 3D chips?
[1] https://www.alibaba.com/product-detail/Thermal-Management-Gr...