The diagram shows a transistor. Which explains whether boron or arsenic is the dopant
most likely used in the semiconductor layer marked
with +2
-This layer is the controller of an NPN transistor, so it
could include boron.
-This layer is the emitter of an NPN transistor, so it
could include arsenic.
-This layer is the controller of a PNP transistor, so it
could include arsenic.
-This layer is the emitter of a PNP transistor, so it
could include boron
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