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

KEYWORDS

Kronig-Penny Model; MQW Structure; Potential Well; Barrier

Cite this paper

Y. Zhang and Y. Wang -Energy Band Analysis of MQW Structure Based on Kronig-Penny Model,- Journal of Modern Physics, Vol. 4 No. 7, 2013, pp. 968-973. doi: 10.4236-jmp.2013.47130.





Autor: Yu Zhang, Yi Wang

Fuente: http://www.scirp.org/



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