Growth mode transfer of self-assembled CdSe quantum dots grown by molecular beam epitaxy

Formation of a precursor layer in self-assembled CdTe quantum dots grown on ZnSe by molecular beam epitaxy

“…The thickness of the PCL fluctuates and is discontinuous. It is consistent with aforementioned research in CdSe/ZnSe QDs [10,11]. Kim et al proposed that the inter-diffusion has an important role in the growth dynamics of CdSe QDs, i.e.…”

“…A schematic drawing of the QDs with the platelets is shown in the inset. Note that the existence of the platelet has been verified in several II-VI SK mode QDs systems, such as CdSe/ZnSe QDs [10,11], CdTe/ZnTe QDs [12], and ZnMnTe/ZnSe QDs [13]. Despite the large lattice mismatch between CdTe and ZnSe, the AS method makes the initial deposition process of Cd atoms on Se-stabilized ZnSe similar to that for CdSe/ZnSe QDs.…”

Quasi-Stranski–Krastanow growth mode of self-assembled CdTe quantum dots grown on ZnSe by molecular beam epitaxy

“…In a manner similar to that for group-I samples, a CdSelike precursor layer was present at about 2.740 eV in the spectrum of the group-II 0.6 ML sample. Notably, the CdSe wetting layer formed as the coverage below 2.0 MLs [4,5]. Additionally, the phonon replica of the CdSe-like wetting layer was also observed.…”

“…The trace of the quantum dot emissions as a function of the coverage thickness was linear. In contrast, the trace of the CdSe QDs emissions as a function of the coverage thickness in the SK growth mode has two slops [5]. Therefore, while the group-I samples have ZnTe-like wetting layers, the growth mode of CdTe QDs is the VW mode.…”

“…Much of the research in this area has focused on II-VI SAQDs, CdSe/ZnSe [1][2][3][4][5], ZnTe/ZnSe [6,7] and CdTe/ZnTe [8][9][10] SAQDs, whose lattice mismatches are approximately 7%. Their growth modes are confirmed to be Stranski-Krastanow (SK) growth mode, implying that a two-dimensional wetting-layer is present between the dots and the matrix.…”