Enhanced carrier multiplication in engineered quasi-type-II quantum dots

Claudiu M. Cirloganu, Lazaro A. Padilha, Qianglu Lin, Nikolay S. Makarov, Kirill A. Velizhanin, Hongmei Luo, Istvan Robel, Jeffrey M. Pietryga and Victor I. Klimov ()
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Claudiu M. Cirloganu: Center for Advanced Solar Photophysics, Los Alamos National Laboratory
Lazaro A. Padilha: Center for Advanced Solar Photophysics, Los Alamos National Laboratory
Qianglu Lin: New Mexico State University
Nikolay S. Makarov: Center for Advanced Solar Photophysics, Los Alamos National Laboratory
Kirill A. Velizhanin: Center for Advanced Solar Photophysics, Los Alamos National Laboratory
Hongmei Luo: New Mexico State University
Istvan Robel: Center for Advanced Solar Photophysics, Los Alamos National Laboratory
Jeffrey M. Pietryga: Center for Advanced Solar Photophysics, Los Alamos National Laboratory
Victor I. Klimov: Center for Advanced Solar Photophysics, Los Alamos National Laboratory

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract One process limiting the performance of solar cells is rapid cooling (thermalization) of hot carriers generated by higher-energy solar photons. In principle, the thermalization losses can be reduced by converting the kinetic energy of energetic carriers into additional electron-hole pairs via carrier multiplication (CM). While being inefficient in bulk semiconductors this process is enhanced in quantum dots, although not sufficiently high to considerably boost the power output of practical devices. Here we demonstrate that thick-shell PbSe/CdSe nanostructures can show almost a fourfold increase in the CM yield over conventional PbSe quantum dots, accompanied by a considerable reduction of the CM threshold. These structures enhance a valence-band CM channel due to effective capture of energetic holes into long-lived shell-localized states. The attainment of the regime of slowed cooling responsible for CM enhancement is indicated by the development of shell-related emission in the visible observed simultaneously with infrared emission from the core.

Date: 2014
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DOI: 10.1038/ncomms5148

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