Abstract
Optical properties of multilayer quantum dots (MQDs) self-formed in the GaP/InP short period superlattice (SL)/InGaP multilayer structures are investigated by changing SL-period ( P) and InGaP barrier thickness ( B). By decreasing P, photoluminescence (PL) peak energy shifts toward higher energy due to quantum size effect along the growth direction (vertical direction). PL linewidth broadening with temperature is reduced by decreasing P and B. This improvement is attributed to the reduction of potential distribution among QDs and the enhancement of quantum confinement along the vertical direction, and to the enhancement of quantum confinement due to the vertical coupling effect between QDs. Very small temperature variation of PL peak energy is observed in these MQDs, which is attributed to the existence of the multiaxial strains in the MQDs.
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