2015-08-21
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15. Read the text “The P-N Junction”. Mark the following sentences as true (T) or false (F).
1. Diffusion is a tendency of charge carriers to move to areas of high density.
2. The free electrons and holes have completely ordered motions in the lattice.
3. On average the N-type region gains holes and loses electrons and the P-type region gains electrons and loses holes.
4. The region to the left of the junction becomes positively charged and the region to the right of the junction becomes negatively charged.
5. If a silicon crystal is doped with donor atoms at one end and with acceptor atoms at the other end, the crystal will have only N-type regions.
6. In Fig.2 the plane AB is the P-N junction.
7. A hole passing into the N-type region, or an electron passing into the P-type region, becomes a majority charge carrier.
