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Saturated dot density of InAs/GaAs self-assembled quantum dots grown at high growth rate

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7 Author(s)
Chia, C.K. ; Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602 ; Zhang, Y.W. ; Wong, S.S. ; Yong, A.M.
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The variation in dot density, dot size, and photoluminescence intensity in two series of 1.8 and 2.5 ML InAs quantum dots (QDs) as a function of InAs growth rate has been investigated. As the growth rate increases from 0.14 to 3.60 ML/s, the average dot lateral size reduces by half, whereas the dot density increases five times. Nonlinear relationships were observed between dot density, dot size, and growth rate. The dot density is found to saturate at a growth rate of 3 ML/s. High dot density of 7.76×1011 cm-2 has been demonstrated and is beneficial for applications in high power QD devices.

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Applied Physics Letters  (Volume:90 ,  Issue: 16 )