Quantum simulation of multiple-exciton generation in a nanocrystal by a single photon

We have shown theoretically that efficient multiple-exciton generation (MEG) by a single photon can be observed in small nanocrystals. Our quantum simulations that include hundreds of thousands of exciton and multiexciton states demonstrate that the complex time-dependent dynamics of these states in...

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Bibliographic Details
Published in:Physical review letters 2010-09, Vol.105 (13), p.137401-137401, Article 137401
Main Authors: Witzel, Wayne M, Shabaev, Andrew, Hellberg, C Stephen, Jacobs, Verne L, Efros, Alexander L
Format: Article
Language:English
Subjects:
NANOSCIENCE AND NANOTECHNOLOGY
solar (photovoltaic), solar (fuels), solid state lighting, bio-inspired, electrodes - solar, defects, charge transport, materials and chemistry by design, optics, synthesis (novel materials), synthesis (scalable processing)
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Summary:We have shown theoretically that efficient multiple-exciton generation (MEG) by a single photon can be observed in small nanocrystals. Our quantum simulations that include hundreds of thousands of exciton and multiexciton states demonstrate that the complex time-dependent dynamics of these states in a closed electronic system yields a saturated MEG effect on a picosecond time scale. Including phonon relaxation confirms that efficient MEG requires the exciton-biexciton coupling time to be faster than exciton relaxation time.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.105.137401