Ultrafast photophysics of multiexcitons in strongly confined semiconductor nanocrystals

Victor I. Klimov

Ultrafast photophysics of multiexcitons in strongly confined semiconductor nanocrystals

Los Alamos National Laboratory

Research output: Contribution to journal › Conference article

Abstract

The ultrafast optical technique was used to study the multiexciton states in size- and shape-controlled CdSe and PbSe nanocrystals (NC). The effect of the zero-dimensional to one-dimensional transition on the efficiency of multiparticle Auger recombination using a series of quantum rods with different aspect ratios was also investigated. The transition from the three-to two-particle recombination process was observed as the nanocrystal aspect ratio was increased. The effect of quantum confinement on impact ionization using a series of PbSe NC of different sizes was also investigated. The results show that impact ionization process in NCs can be used to increase the power conversion efficiency of NC-based solar cells.

Original language	English
Pages (from-to)	447-448
Number of pages	2
Journal	Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS
Volume	1
Publication status	Published - Dec 1 2004
Event	2004 IEEE LEOS Annual Meeting Conference Proceedings, LEOS 2004 - Rio Grande, Puerto Rico Duration: Nov 7 2004 → Nov 11 2004

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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Klimov, V. I. (2004). Ultrafast photophysics of multiexcitons in strongly confined semiconductor nanocrystals. Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS, 1, 447-448.

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abstract = "The ultrafast optical technique was used to study the multiexciton states in size- and shape-controlled CdSe and PbSe nanocrystals (NC). The effect of the zero-dimensional to one-dimensional transition on the efficiency of multiparticle Auger recombination using a series of quantum rods with different aspect ratios was also investigated. The transition from the three-to two-particle recombination process was observed as the nanocrystal aspect ratio was increased. The effect of quantum confinement on impact ionization using a series of PbSe NC of different sizes was also investigated. The results show that impact ionization process in NCs can be used to increase the power conversion efficiency of NC-based solar cells.",

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AB - The ultrafast optical technique was used to study the multiexciton states in size- and shape-controlled CdSe and PbSe nanocrystals (NC). The effect of the zero-dimensional to one-dimensional transition on the efficiency of multiparticle Auger recombination using a series of quantum rods with different aspect ratios was also investigated. The transition from the three-to two-particle recombination process was observed as the nanocrystal aspect ratio was increased. The effect of quantum confinement on impact ionization using a series of PbSe NC of different sizes was also investigated. The results show that impact ionization process in NCs can be used to increase the power conversion efficiency of NC-based solar cells.

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