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The strong influences of temperature and vacuum on the optical properties of In 0.3 Ga 0.7 As surface quantum dots (SQDs) are systematically investigated by photoluminescence (PL) measurements. For comparison, optical properties of buried quantum dots (BQDs) are also measured. The line-width, peak wavelength, and lifetime of SQDs are significantly different from the BQDs with the temperature and vacuum varied. The differences in PL response when temperature varies are attributed to carrierdoi:10.1007/s13320-018-0475-z fatcat:yyegpeccsreyzpz2juowdkgnge