Ultrafast carrier dynamics in PbS quantum dots

Qing Shen,Kenji Katayama,Tsuguo Sawada,Sojiro Hachiya,Taro Toyoda

doi:10.1016/j.cplett.2012.05.076

Ultrafast carrier dynamics in PbS quantum dots

Qing Shen, Kenji Katayama + Show 3 more

https://doi.org/10.1016/j.cplett.2012.05.076

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Journal: Chemical Physics Letters	Publication Date: Jun 27, 2012
Citations: 27

Affiliation: University of Electro-Communications, Japan Science and Technology Agency, Chuo University

#Multiple Exciton Generation #Transient Grating Technique + Show 8 more

Abstract
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Abstract

Ultrafast carrier dynamics in PbS quantum dots (QDs) is characterized using a transient grating technique. In addition to an initial peak, a new peak appears at about 3ps when the excitation photon energy is greater than 2.7Eg (Eg: band gap between LUMO and HOMO in the QDs). The first peak is considered to be related to hot carriers and the second one is believed to result from multiple exciton generation (MEG). We found that MEG began in as fast as 200fs and complete around 3ps. We succeeded in observing the dynamics of MEG occurrence in PbS QDs.

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