Resonant Energy Transfer Dynamics between Colloidal Perovskite Quantum Dots and Monolayer Tungsten Diselenide

International Journal of Physics | Vol. 11, No. 3, March 2020 | pp. 17–24

DOI: 10.46882/2020/IJP/000119

Research Article

Title: Resonant Energy Transfer Dynamics between Colloidal Perovskite Quantum Dots and Monolayer Tungsten Diselenide

Names of Authors: T. H. Nguyen¹, P. L. Becker²

Authors’ Affiliations:
¹ Department of Physics, Vietnam National University, Hanoi, Vietnam
² Institute for Plasma Research, University of Stuttgart, Stuttgart, Germany

Abstract: Hybrid semiconductor nanostructures combining zero-dimensional quantum dots 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 perovskite (CsPbBr3) 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 an operating temperature of 300 K. The experimental data reveal a strong 82.0% quenching of the quantum dot photoluminescence emission when coupled to the WSe² monolayer. Concurrently, the average fluorescence lifetime of the quantum dots decreased from 6.2 ns down to 1.12 ns. This lifetime reduction yields a calculated FRET efficiency of 81.9% with a corresponding energy transfer rate of 0.73 ns⁻¹. The donor-acceptor separation distance was estimated to be 3.8 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: December 14, 2019; Revised: January 20, 2020; Accepted: February 08, 2020; Published: March 11, 2020

Citation: Nguyen, T. H., & Becker, P. L. (2020). Resonant Energy Transfer Dynamics between Colloidal Perovskite Quantum Dots and Monolayer Tungsten Diselenide. International Journal of Physics, 11(3), 17–24.

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