More LED Chips

We’ll begin by looking at the main advantage of moving to larger wafers–more LED chips. Yes, this is the biggest advantage, but it’s also unfortunately often overstated in this way: a large diameter 6-in wafer has nine times more surface area than a 2-in wafer on which to form LED chips.

While the prior statement is certainly true in regards to the simple surface area of the wafers, the suggestion that you get 9× more chip throughput by simply using 6-in wafers sounds too good to be true – and it is. What’s the real story? In order to answer that, we need to look closely at the layout of LED chips, both on the wafer and as a group of wafers in the MOCVD (metal organic chemical vapor deposition) reactor where LEDs are formed.
In addition to 6-or 8-in wafers simply being larger, we have to consider several other factors to get a true picture of the benefit of “more LED chips.” These factors are exclusion zone, LED chip shape and size, and MOCVD reactor layout. We’ll explain these one at a time, then feed them into a true comparison simulator that will give us a much more reasonable look at the number of LED chips supported by various wafer sizes.


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