![]() ![]() Therefore, well over 90 percent of the holes that enter the base become attracted to the large negative collector voltage and pass right through the base. But again, remember that the base region is made very thin to prevent the recombination of holes with electrons. Once in the base, the holes combine with base electrons. ![]() In the PNP transistor shown in figure 2-11, the positive voltage on the emitter repels the holes toward the base. The interaction between the forward- and reverse-biased junctions in a PNP transistor is very similar to that in an NPN transistor, except that in the PNP transistor, the majority current carriers are holes. In this way, the PNP transistor is constructed and it can be used as a switch.2-14 Figure 2-10.The reverse-biased junction in a PNP transistor.
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