Why is there a thin region of one material type sandwiched

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What are the names of the three regions of the bipolar junction transistor? Why is there a thin region of one material type "sandwiched" between two layers of the opposite material type?

Reference no: EM13225332

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Why is there a thin region of one material type sandwiched : What are the names of the three regions of the bipolar junction transistor Why is there a thin region of one material type "sandwiched" between two layers of the opposite material type
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