A.E. Zhukov, P.S. Kop'ev, Zh. The quantum dots exhibit short range order, aligning along rows in directions. For optoelectonic applications high quantum efficiency is prerequisite.
Further requirements are strong confinement and spatial homogeneity.
The optical properties of the QD ensemble were probed by photoluminescence and absorption. Then the substrate temperature is lowered to 450 C and the desired amount of InAs is deposited. The actual resolution is somewhat lowered due to carrier diffusion. TEM images for the 2ML and 4ML samples are shown in Fig.1 . The contrast is mainly due to strain fields.