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Efficient Multiple Exciton Generation in Monolayer MoS2.
Ashish Soni1,2, Dushyant Kushavah1,2, Li-Syuan Lu3
1School of Physical Sciences, Indian Institute of Technology Mandi, Kamand, Mandi 175005, Himachal Pradesh, India.
The Journal of Physical Chemistry Letters
|March 20, 2023
Summary
Multiple exciton generation (MEG) in molybdenum disulfide (MoS2) monolayers boosts light-harvesting efficiency. This discovery in van der Waals materials could lead to advanced solar cells and photodetectors.
Area of Science:
- Materials Science
- Photovoltaics
- Nanotechnology
Background:
- Excess photoexcitation energy is lost as heat, limiting light-harvesting device efficiency.
- Multiple exciton generation (MEG) offers a route to surpass the Shockley-Queisser limit by producing multiple excitons from a single high-energy photon.
- Monolayer transition metal dichalcogenides (TMDs) show promise for light harvesting due to their strong light absorption.
Purpose of the Study:
- To investigate efficient multiple exciton generation (MEG) in monolayer molybdenum disulfide (MoS2).
- To explore the potential of van der Waals (vdW) layered materials for next-generation photovoltaic applications.
Main Methods:
- Experimental investigation of MEG in monolayer MoS2.
- Utilized various experimental approaches to demonstrate exciton multiplication signatures.
- Analyzed the underlying mechanisms responsible for efficient MEG in MoS2.
Main Results:
- Achieved highly efficient MEG with 86% efficiency in monolayer MoS2.
- Observed MEG with a low threshold energy.
- Demonstrated clear signatures of exciton multiplication.
- Identified vdW-layered materials as promising for MEG.
Conclusions:
- Monolayer MoS2 exhibits efficient MEG, offering a pathway to overcome theoretical efficiency limits in solar energy conversion.
- Van der Waals layered materials, like MoS2, are strong candidates for developing next-generation, mechanically flexible, and highly efficient solar cells and photodetectors.
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