Schematic diagram of double stack QD laser structure with barriers.
Room-temperature PL characteristics for single stack QD structures with and barriers.
Size distribution data for QD on measured using AFM. (a) QD on (b) QD on .
Low-temperature PL characteristics of single stack QD structures with and barriers.
Ground-state PL peak intensity as a function of temperature for and barriers.
Wavelength of QD ground-state transition as a function of content of the barriers and temperature.
AFM images for QDs on . (a) QDs on (b) QDs on (c) QDs on .
TEM image of double-stacked QD laser structure with barriers.
QD PL intensity comparison for samples with various interruption times after the spacer layer growth.
Summary of AFM measurements of QDs grown on and .
Summary of device results for double stack QD laser structures with QDs grown on and barriers.
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