Resonant Energy Transfer Dynamics between Colloidal Quantum Dots and Monolayer Transition Metal Dichalcogenides

International Journal of Physics | Vol. 5, No. 5, May 2014 | pp. 33–40

DOI: 10.46882/2014/IJP/000049

Research Article

Title: Resonant Energy Transfer Dynamics between Colloidal Quantum Dots and Monolayer Transition Metal Dichalcogenides

Names of Authors: T. H. Nguyen¹, C. M. Brauer²

Authors’ Affiliations: ¹Department of Physics, Vietnam National University, Hanoi 100000, Vietnam; ²Institut für Physik, Humboldt-Universität zu Berlin, 12489 Berlin, Germany

Abstract: Hybrid semiconductor nanostructures combining zero-dimensional and two-dimensional materials provide new opportunities for developing advanced light-harvesting systems. This paper examines the non-radiative Förster resonant energy transfer (FRET) dynamics between colloidal cadmium selenide (CdSe) quantum dots and monolayer tungsten diselenide (WSe²). The hybrid interfaces were fabricated via sequential spin-coating routines onto quartz substrates. We performed steady-state photoluminescence and time-resolved single-photon counting measurements at 300 K. The experimental data reveal a strong 78.0% quenching of the quantum dot photoluminescence emission when coupled to the WSe² monolayer. Concurrently, the average fluorescence lifetime of the CdSe quantum dots decreased from 4.8 ns to 1.05 ns. This lifetime reduction yields a calculated FRET efficiency of 78.1% with a corresponding energy transfer rate of 0.74 ns⁻¹. The donor-acceptor separation distance was estimated to be 4.2 nm using the standard Förster mathematical model. Spectral overlap analysis confirms that energy transfer is mediated by the alignment between quantum dot emission and the WSe² exciton absorption bands. These rapid energy transfer dynamics show that quantum dot sensitization can significantly enhance light absorption in ultra-thin optoelectronic architectures.

Keywords: Quantum dots; transition metal dichalcogenides; resonant energy transfer; fluorescence lifetime; hybrid nanostructures; optoelectronics

Manuscript Timeline: Received: February 12, 2014; Revised: March 26, 2014; Accepted: April 15, 2014; Published: May 16, 2014

Citation: Nguyen, T. H., & Brauer, C. M. (2014). Resonant Energy Transfer Dynamics between Colloidal Quantum Dots and Monolayer Transition Metal Dichalcogenides. International Journal of Physics, 5(5), 33–40.

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