Spin-exchange carrier multiplication was demonstrated in manganese-doped core/shell PbSe/CdSe quantum dots (QDs). This process overcomes the limitations of conventional carrier multiplication and yields three-fold enhanced multiexciton yield versus undoped samples.
Significance and Impact
Spin-exchange interactions open a new, highly efficient carrier multiplication pathway, which could significantly improve the performance of optoelectronic, photovoltaic, and photocatalytic devices.
- High-resolution near-infrared photoluminescence (PL) dynamics measured at CNM revealed a pronounced bi-excitonic component despite the use of low, sub-single-exciton pump levels.
About Argonne’s Center for Nanoscale Materials
The Center for Nanoscale Materials is one of the five DOE Nanoscale Science Research Centers, premier national user facilities for interdisciplinary research at the nanoscale supported by the DOE Office of Science. Together the NSRCs comprise a suite of complementary facilities that provide researchers with state-of-the-art capabilities to fabricate, process, characterize and model nanoscale materials, and constitute the largest infrastructure investment of the National Nanotechnology Initiative. The NSRCs are located at DOE’s Argonne, Brookhaven, Lawrence Berkeley, Oak Ridge, Sandia and Los Alamos National Laboratories. For more information about the DOE NSRCs, please visit https://science.osti.gov/User-Facilities/User-Facilities-at-a-Glance.
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