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Researchers have demonstrated that single dopant atoms in tungsten diselenide bilayers act as elementary photovoltaic units, generating nanometer-scale photocurrents through localized field effects rather than traditional bulk junction mechanisms. This discovery establishes a fundamentally new charge separation process at the atomic scale where excitons are split by individual impurities independent of illumination power or density. Such findings advance our understanding of light-to-electricity conversion in 2D materials, offering pathways for next-generation quantum photovoltaic devices and ultra-small optoelectronic components.
WSe2 bilayers reveal quantum photocurrent linked to single dopants

Researchers linked a measurable photocurrent in WSe2 bilayers to individual dopants, revealing how localized fields impact charge separation.
Researchers have, for the first time, directly visualized photocurrent hotspots centered on single dopants within bilayer tungsten diselenide, revealing a photovoltaic response at the nanometer scale. Using photoconductive atomic force microscopy, the team observed these nanometer-scale currents with opposite polarities depending on the dopant’s layer. Vertical WSe2/V:WSe2 homobilayer devices exhibited a macroscopic photocurrent that scales linearly with dopant concentration and a compensation…
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