Abstract
In quantum dot superlattices, wherein quantum dots are periodically arranged, electronic states between adjacent quantum dots are coupled by quantum resonance, which arises from the short-range electronic coupling of wave functions, and thus the formation of minibands is expected. Quantum dot superlattices have the potential to be key materials for new optoelectronic devices, such as highly efficient solar cells and photodetectors. Herein, we report the fabrication of CdTe quantum dot superlattices via the layer-by-layer assembly of positively charged polyelectrolytes and negatively charged CdTe quantum dots. We can thus control the dimension of the quantum resonance by independently changing the distances between quantum dots in the stacking (out-of-plane) and in-plane directions. Furthermore, we experimentally verify the miniband formation by measuring the excitation energy dependence of the photoluminescence spectra and detection energy dependence of the photoluminescence excitation spectra.
Highlights
In quantum dot superlattices, wherein quantum dots are periodically arranged, electronic states between adjacent quantum dots are coupled by quantum resonance, which arises from the short-range electronic coupling of wave functions, and the formation of minibands is expected
For the film samples in which CdTe quantum dots (QDs) are randomly dispersed, the PL decay time is independent of temperature[52], while for the QD multilayer prepared with the condition of low σin-plane, the decay time depends on the temperature
The experimental results of the excitation energy dependence of the PL spectra and detection energy dependence of the PL excitation (PLE) spectra clearly demonstrate the formation of coupled electronic states in the CdTe QD superlattices (QDSLs)
Summary
Wherein quantum dots are periodically arranged, electronic states between adjacent quantum dots are coupled by quantum resonance, which arises from the short-range electronic coupling of wave functions, and the formation of minibands is expected. 1D quantum resonance occurs in the stacking direction in QD multilayers prepared with low σin-plane.
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