The BJ story in semicon industry

I work as technician in a Singapore semiconductor factory. Here I share my working life as technician.

In our line of semicon, we refer BJ to belljar. The function of belljar is to suck.

Suck away the oxide layer on the product (wafer) before the next step metal deposition.

But you cannot let the BJ to suck too much. Working too hard (Used too frequent) then it could explode. And you will get very "excited" to see this scene.

All BJ broken into pieces and you need to clean the shit.

After explosion, you will expose the chamber to the atmosphere, And you get even more excitement of the suction. All dusts and debris get into the chamber and could harm to the pump and choke it.

Broken BJ at the welding point, a common weak point.

Another weak point is at the side, where this is more contributed by BJ handling. BJ is not treated gently then it broke during transportation.

When BJ broke, investigation need to take place and analyse the weak point and questions why it broke. So as to prevent similar problem arise again.

Excited to know more about the BJ? Hope you enjoy the series of BJ. Thumb up if you enjoy reading this. Thanks