Abstract
We report the effects of varying growth parameters on the photoluminescence (PL) and time-resolved photoluminescence (TRPL) emission from layered Zn-Se:Te structures with submonolayer quantities of ZnTe grown by a combination of migration-enhanced epitaxy (MEE) and molecular beam epitaxy (MBE). Dependences on Te effusion cell temperature (T Te source) and “wait time” (duration for which all shutters are closed, t all-off) are investigated to show that these parameters contribute towards changing the size and/or composition of the quantum dots (QDs). Optical studies showed that increasing T Te source resulted in the formation of larger QDs. Increasing t all-off from 0 s to 3 s contributed towards the formation of larger QDs, while further increasing t all-off to 9 s led to desorption of Te adatoms which resulted in smaller QDs. These parameters are easy to control, and thus understanding their effects should help us to gain better control towards obtaining high-quality QDs.
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