Hidden Dember Effect in WSe<sub>2</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 42091525.
- Also identified by DOI 10.1021/acsnano.6c01903.
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Abstract
The Dember effect is highly valuable for energy harvesting, photodetection, catalysis, and terahertz radiation generation. However, the realization of the Dember effect in transition metal dichalcogenides (TMDs) has been rarely reported, primarily due to the requirement for high photogenerated carrier density and its complex coupling with surface photovoltage (SPV), charging, and space charge effects. Here, we reveal a hidden Dember effect in the typical TMD semiconductor WSe<sub>2</sub> via angle-resolved photoemission spectroscopy. By tracking light-intensity-dependent band shifts across the ultraviolet/visible wavelength range, we directly disentangle the hitherto hidden Dember effect from the intertwined SPV and charging effects. Furthermore, we demonstrate control of the hidden Dember effect by tuning the photogenerated carrier density in quasi-equilibrium via illumination brightness, temperature, and bulk dopant concentration. This work not only extends the scope of the Dember effect to layered semiconductors but also elucidates the significant impacts of light-matter interactions in the low-illumination and low-temperature region.