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Related Experiment Video

Updated: May 8, 2026

Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2
11:27

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Published on: December 8, 2016

Hidden Dember Effect in WSe2.

Keming Zhao1, Qiang Wan1, Enting Li1

  • 1Institute for Advanced Studies, Wuhan University, Wuhan 430072, China.

ACS Nano
|May 6, 2026
PubMed
Summary
This summary is machine-generated.

Researchers discovered a hidden Dember effect in tungsten diselenide (WSe2) semiconductors. This finding is crucial for advancing energy harvesting and optoelectronic devices by understanding light-matter interactions.

Keywords:
Dember effectSPVangle-resolved photoemission spectroscopyelectronic structuretransition metal dichalcogenides

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Optoelectronics

Background:

  • The Dember effect is vital for applications like energy harvesting and photodetection.
  • Realizing the Dember effect in transition metal dichalcogenides (TMDs) is challenging due to high carrier density requirements and complex surface effects.

Purpose of the Study:

  • To reveal and characterize the Dember effect in tungsten diselenide (WSe2), a common TMD.
  • To understand and control the Dember effect by disentangling it from surface photovoltage (SPV) and charging effects.

Main Methods:

  • Angle-resolved photoemission spectroscopy (ARPES) was used to study WSe2.
  • Light-intensity-dependent band shifts in the ultraviolet/visible range were tracked.
  • The influence of illumination brightness, temperature, and doping on the Dember effect was investigated.

Main Results:

  • A previously hidden Dember effect was successfully identified in WSe2.
  • The Dember effect was directly disentangled from SPV and charging effects.
  • Control over the Dember effect was demonstrated by manipulating photogenerated carrier density.

Conclusions:

  • This study extends the Dember effect's applicability to layered semiconductors like WSe2.
  • It highlights the significant role of light-matter interactions, especially under low illumination and low temperatures.
  • The findings pave the way for enhanced optoelectronic devices and energy harvesting technologies.