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New Quantum Dots Findings from New Mexico State University Described (Enhanced carrier multiplication in engineered quasi-type-II quantum dots)

August 15, 2014

By a News Reporter-Staff News Editor at Science Letter -- Investigators discuss new findings in Quantum Dots. According to news reporting originating from Las Cruces, New Mexico, by NewsRx correspondents, research stated, "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)."

Our news editors obtained a quote from the research from New Mexico State University, "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."

According to the news editors, the research concluded: "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."

For more information on this research see: Enhanced carrier multiplication in engineered quasi-type-II quantum dots. Nature Communications, 2014;5():26-33. Nature Communications can be contacted at: Nature Publishing Group, Macmillan Building, 4 Crinan St, London N1 9XW, England. (Nature Publishing Group -; Nature Communications -

The news editors report that additional information may be obtained by contacting C.M. Cirloganu, New Mexico State University, Dept. of Chem Engn, Las Cruces, NM 88003, United States. Additional authors for this research include L.A. Padilha, Q.L. Lin, N.S. Makarov, K.A. Velizhanin, H.M. Luo, I. Robel, J.M. Pietryga and V.I. Klimov (see also Quantum Dots).

Keywords for this news article include: Las Cruces, New Mexico, Engineering, Quantum Dots, United States, Nanotechnology, Quantum Physics, Emerging Technologies, North and Central America

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Source: Science Letter

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