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The effects of different potential well depths, well widths and
barrier widths on energy band of multiple quantum well (MQW) structures are
discussed in detail based on Kronig-Penny model. The results show that if the
well and barrier width stay unchanged, the first and second band gaps increase
linearly with the well depth. When the well depth is constant, the first and
second band gaps increase exponentially with the barrier width in a wide well.
However, in narrow well one, the second band gap saturates when the barrier
width is wide enough. On condition that the well and barrier have equal width,
the first band gap decreases exponentially with well-barrier width while the
second gap still shows an exponential increase with the width. These results are
insightful for the design of MQW
structure optoelectronic devices.