Opaque Intel chips?
I wonder why Intel chips are opaque (doped silicon?). Pentium 2, Pentium 4, Core 2, Sandy- / Ivy-Bridge, Haswell and more, all of them are opaque and dark. What typ of silicon is Intel using for his wafers? Just Kaby-Lake has a better transmission (Coffee-Lake not tested).
It seems like all modern chips from Global Foundries and TSMC are transparent @ wavelength +1050nm.
*removed TIM passivation layers by sanding and lapping the surface
*2 sanded and lapped surface
*3 blank chip without transistors (old etching failure)
t=thickness
Opaque Intel chips?
I wonder why Intel chips are opaque (doped silicon?). Pentium 2, Pentium 4, Core 2, Sandy- / Ivy-Bridge, Haswell and more, all of them are opaque and dark. What typ of silicon is Intel using for his wafers? Just Kaby-Lake has a better transmission (Coffee-Lake not tested).
It seems like all modern chips from Global Foundries and TSMC are transparent @ wavelength +1050nm.
*removed TIM passivation layers by sanding and lapping the surface
*2 sanded and lapped surface
*3 blank chip without transistors (old etching failure)
t=thickness