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Carrier Multiplication and Photoexcited Many-Body States in Solution-Processed 2H-MoSe2.

Goutam Ghosh1, Tian Carey2, Stevie Furxhiu1

  • 1Chemical Engineering Department, Delft University of Technology, Van der Maasweg 9, Delft 2629 HZ, The Netherlands.

ACS Nano
|March 6, 2025
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Summary
This summary is machine-generated.

Carrier multiplication (CM) in 2H-MoSe2 generates multiple charge carriers per photon, boosting solar cell efficiency. This study confirms CM in solution-processed 2H-MoSe2, showing potential for photovoltaic applications.

Keywords:
carrier multiplicationexcitonssolution-processed transition metal dichalcogenideterahertz spectroscopytransient absorption spectroscopytrions

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Solid State Physics

Background:

  • Carrier multiplication (CM) enhances solar cell efficiency by generating multiple electron-hole pairs from a single high-energy photon.
  • Transition metal dichalcogenides like 2H-MoTe2 and 2H-WSe2 are known for efficient CM.
  • 2H-MoSe2, with its similar band structure, is a potential candidate for efficient CM.

Purpose of the Study:

  • To establish the occurrence and efficiency of CM in solution-processed 2H-MoSe2 thin films.
  • To characterize the dynamics of excitons and free charge carriers in 2H-MoSe2.
  • To assess the potential of 2H-MoSe2 for photovoltaic device applications.

Main Methods:

  • Ultrafast transient optical absorption spectroscopy to study exciton and charge carrier dynamics.
  • Terahertz spectroscopy to analyze charge carrier scattering.
  • Theoretical modeling to reproduce experimental CM efficiency.

Main Results:

  • Efficient CM was observed in solution-processed 2H-MoSe2, comparable to other transition metal dichalcogenides.
  • CM was detected below the band gap threshold, attributed to subgap defect states.
  • Photoexcitation primarily yields free charge carriers, with minimal excitonic signatures at the indirect band gap.
  • Lower charge carrier scattering was inferred in 2H-MoSe2 compared to MoTe2.

Conclusions:

  • Solution-processed 2H-MoSe2 exhibits efficient carrier multiplication.
  • The material's properties make it a promising candidate for enhancing photovoltaic device performance.
  • Further research into defect engineering could optimize CM efficiency in 2H-MoSe2.