Extinction Enhancement from a Self-Assembled Quantum
Dots Monolayer Using a Simple Thin Films Process
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Abstract
Hybrid
nanostructures are attractive for future use in a variety
of optoelectronic devices. Self-assembled hybrid organic/quantum dots
can couple quantum properties to semiconductor devices and modify
their functionality. These devices are simple to fabricate and control;
however, they usually demonstrate low quantum efficiency. In this
work we present experimental results of large extinction enhancement
from a monolayer of colloidal quantum dots using a thin gold film
evaporation forming random gold nanoparticles that act as plasmonic
antennas. The random structures guarantee no sensitivity to polarization
changes. The fabrication process of the plasmonic gold nanoparticles
is simple and cheap and can be easily integrated with existing semiconductor
devices. By matching the plasmonic resonance and the colloidal quantum
dots bandgap we achieve up to 16% light extinction, which is 13-fold
enhancement, compared to the reference. These results may pave the
way toward realizing more efficient and sensitive photon detectors