Improved performances of 1.3?m InGaAs QD structures grown at high temperature by metal organic chemical vapour deposition
We present InGaAs quantum dots (QDs) grown by metal organic chemical vapour deposition in which, by increasing the growth temperature (from 550 up to 610C), a high emission efficiency beyond 1.3?m and narrow linewidth (down to 22meV at room temperature) can be preserved, with a relevant decrease of defect density. The possibility to grow QDs at higher temperature, close to the cladding growth temperature, allows a strong reduction of the annealing effect when the QDs are inserted in device structures. The spectral blue shift, consequence of this effect, is reduced of 90% in QDs grown at 590C, with respect to those grown at 550C, thus providing electroluminescence emission near 1.3?m.
ingaas metal organic chemical vapour deposition quantum dots laser