Optical and electronic properties of colloidal CdSe Quantum Rings
- URL: http://arxiv.org/abs/2003.11897v2
- Date: Wed, 6 Jan 2021 14:06:27 GMT
- Title: Optical and electronic properties of colloidal CdSe Quantum Rings
- Authors: James Xiao, Yun Liu, Violette Steinmetz, Mustafa \c{C}a\u{g}lar,
Jeffrey Mc Hugh, Tomi Baikie, Nicolas Gauriot, Malgorzata Nguyen, Edoardo
Ruggeri, Zahra Andaji-Garmaroudi, Samuel D. Stranks, Laurent Legrand, Thierry
Barisien, Richard H. Friend, Neil C. Greenham, Akshay Rao and Raj Pandya
- Abstract summary: Luminescent CdSe nanorings are a new type of semiconductor structure that have attracted interest due to their non-trivial toroidal shape.
We use a combination of femtosecond vibrational spectroscopy, temperature-resolved photoluminescence (PL) and single particle measurements to study these materials.
We find that on transformation of CdSe nanoplatelets to nanorings, by perforating the center of platelets, the emission lifetime decreases and the emission spectrum broadens due to ensemble variations in the ring size and thickness.
- Score: 2.7478811288750955
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Luminescent colloidal CdSe nanorings are a new type of semiconductor
structure that have attracted interest due to the potential for unique physics
arising from their non-trivial toroidal shape. However, the exciton properties
and dynamics of these materials with complex topology are not yet well
understood. Here, we use a combination of femtosecond vibrational spectroscopy,
temperature-resolved photoluminescence (PL), and single particle measurements
to study these materials. We find that on transformation of CdSe nanoplatelets
to nanorings, by perforating the center of platelets, the emission lifetime
decreases and the emission spectrum broadens due to ensemble variations in the
ring size and thickness. The reduced PL quantum yield of nanorings (~10%)
compared to platelets (~30%) is attributed to an enhanced coupling between: (i)
excitons and CdSe LO-phonons at 200 cm-1 and (ii) negatively charged
selenium-rich traps which give nanorings a high surface charge (~-50 mV).
Population of these weakly emissive trap sites dominates the emission
properties with an increased trap emission at low temperatures relative to
excitonic emission. Our results provide a detailed picture of the nature of
excitons in nanorings and the influence of phonons and surface charge in
explaining the broad shape of the PL spectrum and the origin of PL quantum
yield losses. Furthermore, they suggest that the excitonic properties of
nanorings are not solely a consequence of the toroidal shape but are also a
result of traps introduced by puncturing the platelet center.
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