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Title: Understanding the features in the ultrafast transient absorption spectra of CdSe quantum dots
Authors: Zhang, Cheng
Do, Thanh Nhut
Ong, Xuanwei
Chan, Yinthai
Tan, Howe-Siang
Keywords: CdSe quantum dots
Nonlinear optical spectroscopy
Issue Date: 2016
Source: Zhang, C., Do, T. N., Ong, X., Chan, Y., & Tan, H.-S. (2016). Understanding the features in the ultrafast transient absorption spectra of CdSe quantum dots. Chemical Physics, 481, 157-164.
Series/Report no.: Chemical Physics
Abstract: We describe a model to explain the features of the ultrafast transient absorption (TA) spectra of CdSe core type quantum dots (QDs). The measured TA spectrum consists of contributions by the ground state bleach (GSB), stimulated emission (SE) and excited state absorption (ESA) processes associated with the three lowest energy transition of the QDs. We model the shapes of the GSB, SE and ESA spectral components after fits to the linear absorption. The spectral positions of the ESA components take into account the biexcitonic binding energy. In order to obtain the correct weightage of the GSB, SE and ESA components to the TA spectrum, we enumerate the set of coherence transfer pathways associated with these processes. From our fits of the experimental TA spectra of 65 Å diameter QDs, biexcitonic binding energies for the three lowest energy transitions are obtained.
ISSN: 0301-0104
DOI: 10.1016/j.chemphys.2016.08.027
Rights: © 2016 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Chemical Physics, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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