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Three‐Dimensional Quantum Dot “Crystal” Formation in CdTe/ZnTe Superlattices
Author(s) -
Maćkowski S.,
Sobczak E.,
Nietubyć R.,
Goerigk G.,
Kret S.,
Dłużewski P.,
Szczepańska A.,
Janik E.,
Kossut J.,
Karczewski G.
Publication year - 2002
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200201)229:1<445::aid-pssb445>3.0.co;2-k
Subject(s) - superlattice , quantum dot , small angle x ray scattering , scattering , transmission electron microscopy , condensed matter physics , materials science , cadmium telluride photovoltaics , crystallography , monolayer , crystal (programming language) , spectral line , crystal structure , molecular physics , optics , chemistry , physics , nanotechnology , astronomy , computer science , programming language
The observation of both vertical and lateral ordering of quantum dots in CdTe/ZnTe superlattices with different thickness of ZnTe spacer is reported. The simultaneous presence of both types of ordering in the studied structures is evidenced by transmission electron microscopy (TEM) and small angle X‐ray scattering (SAXS) studies. The TEM results show that when the spacer thickness is smaller than 25 monolayers, the islands are vertically correlated along the axis tilted by 40° with respect to the growth direction. On the other hand, the SAXS spectra exhibit four intensity maxima of scattering at q = 0.2 Å —1 along [100], [ $ {\bar1}00 $ ], [010] and [ $ 0{\bar1}0 $ ] crystallographic directions. We interpret them as originating from a locally formed square quantum dot lattice.