- Conference date: 14–18 November 2011
- Location: Szeged, Hungary
We present a theoretical study based on the perturbative Luttinger-Kohn model so-called k.P model of high internal electric fields and built-in strain effects on the laser properties of wide bandgap II-VI and Quantum Well (QW) lasers operating in the near UV wavelength range. The high internal electric field (>1MV/cm) are due to the non-centrosymmetric Würtzite crystal structure with spontaneous and piezoelectric polarizations. Internal electric fields are found to induce a red-shift of the laser wavelength, and to reduce drastically the laser gain through the Quantum Confined Stark (QCS) effect. At the same time, the transparency carrier concentration and the laser threshold current densities are found to increase. These effects are more pronounced in than in QW lasers. This is related to stronger internal electric field, and to the sign of the built-in strain which is compressive in the former case, and tensile in the later one.
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