![]() The term bipolar reflects the truth that holes and electrons participate in the process of injection into the material which oppositely polarized. The conductivity decreases because of the lower doping level as it limits the number of free electrons. The doping of the sandwiched layer is less when compared with the outer layers. The emitter is a heavily doped layer, a base is moderately doped and the collector is lightly doped. ![]() The transistor is a three layered semiconductor machine and the three layers are an emitter, base, and collector.
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