Carrier distribution in asymmetric dual quantum wells
Journal
Proceedings of SPIE - The International Society for Optical Engineering
Journal Volume
3419
Pages
369-376
Date Issued
1998
Author(s)
Abstract
The carrier density distribution in MQWs is investigated using asymmetric dual quantum wells (ADQWs). The ADQWs consist of a stake of double quantum wells with different well widths. The corresponding spontaneous emission for each well is centered on 0.8 micrometers and 0.83 micrometers , respectively. The carrier recombination in each quantum well can be distinguished by the EL spectrum. We theoretically calculate the EL spectrum of the ADQWs using the multi-band effective mass theory and density matrix formalism with different carrier distribution condition. In the multi-band effective mass theory, valence band mixing is taken into account by a 4 X 4 Luttinger-Kohn Hamiltonian. A Lorentzian lineshape function is used to include the intraband relaxation and lineshape broadening. The comparison of the calculated results with the experimentally measured EL spectrum and TE/TM mode ratio is given. At 200mA injection current,the theoretical EL spectrum shows very good agreement with the experimental results when the carrier density in the p-side well is 17 percent higher than that in the n-side well. Decreasing the injection current, the uniformity of the carrier density distribution becomes better. The reasons for the behavior of the carrier distributions are briefly discussed.
SDGs
Type
conference paper