Creation of PNP Transistors |
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download it and run it locally. Now the p-active regions of the transistors are ready to be created. A layer of photoresist is grown and etched to define the regions which need to be doped. The poly line running through the middle of the p-active region makes the transistor self-aligned by preventing the boron from doping the area which will form the gate of the transistor. After the application of boron, the new PNP transistor is complete. |