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Related Concept Videos

Carrier Generation and Recombination01:22

Carrier Generation and Recombination

655
Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
655
Carrier Transport01:21

Carrier Transport

489
The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
489

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Related Experiment Video

Updated: Aug 4, 2025

Fabrication and Operation of a Nano-Optical Conveyor Belt
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Hot carrier extraction from 2D semiconductor photoelectrodes.

Rachelle Austin1, Yusef R Farah1, Thomas Sayer2

  • 1Department of Chemistry, Colorado State University, Fort Collins, CO 80523.

Proceedings of the National Academy of Sciences of the United States of America
|April 3, 2023
PubMed
Summary

Researchers developed a new solar cell using monolayer molybdenum disulfide (ML MoS2) for efficient hot carrier extraction. This breakthrough could significantly boost solar energy conversion efficiency and enable novel photochemical reactions.

Keywords:
2D materialshot carrierphotoelectrochemistrysolar energy conversiontransient absorption spectroscopy

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Electrochemistry

Background:

  • Hot carrier solar cells offer potential for high efficiency but often require complex, expensive architectures.
  • Current methods for harnessing hot carriers are limited by material costs and device complexity.

Purpose of the Study:

  • To demonstrate ultrafast hot exciton and free carrier extraction in a cost-effective photoelectrochemical solar cell.
  • To explore the potential of earth-abundant monolayer molybdenum disulfide (ML MoS2) for advanced solar energy conversion.

Main Methods:

  • Utilized a combination of photoelectrochemical measurements and in situ transient absorption spectroscopy.
  • Fabricated a proof-of-concept solar cell using monolayer MoS2 coupled with selective contacts.

Main Results:

  • Achieved ultrafast (<50 fs) hot exciton and free carrier extraction under applied bias.
  • Demonstrated efficient charge transport over large areas (1 cm2) with ultrathin (7 Å) MoS2.

Conclusions:

  • Monolayer MoS2 is a promising material for practical, ultrathin photovoltaic and solar fuel devices.
  • The study provides insights into 2D semiconductor design for enhanced hot carrier utilization.