| http://www.w3.org/ns/prov#value | - In this case, one of the well and the barrier may be doped with both an acceptor and a donor impurities, only the well may be doped with one of the acceptor and the donor impurities, the barrier may be doped with one of the donor and the acceptor impurities, and the both of the well and the barrier may be non-doped layers.
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