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Nano Research 2020, 13(3): 824-831 https://doi.org/10.1007/s12274-020-2703-2
Research Article | Issue | Published: 26 February 2020

Surface and intrinsic contributions to extinction properties of ZnSe quantum dots

Show Author's Information Shangxin Lin1,2,  Jiongzhao Li2,  Chaodan Pu2,  Hairui Lei2,  Meiyi Zhu2,  Haiyan Qin2,  Xiaogang Peng2( )
College of Information Science and Technology, Huaqiao University, Xiamen 361021, China
Center for Chemistry of Novel & High-Performance Materials, Department of Chemistry, Zhejiang University, Hangzhou 310027, China
Keywords:
quantum dots, surface state, extinction coefficient, ZnSe
Topics:
Carbon quantum dotsEnergy gapGraphene quantum dotsIINanocrystalsSemiconductor quantum dotsSurface statesVI semiconductorsZinc Selenide
Cite this article:
Lin S, Li J, Pu C, et al. Surface and intrinsic contributions to extinction properties of ZnSe quantum dots. Nano Research, 2020, 13(3): 824-831. https://doi.org/10.1007/s12274-020-2703-2
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Abstract Full text Electronic supplementary material About this article

This work studies extinction properties of ZnSe quantum dots terminated with either Se-surface or Zn-surface (Se-ZnSe or Zn-ZnSe QDs). In addition to commonly observed photoluminescence quenching by anionic surface sites, Se-ZnSe QDs are found to show drastic signatures of Se-surface states in their UV-visible (Vis) absorption spectra. Similar to most QDs reported in literature, monodisperse Zn-ZnSe QDs show sharp absorption features and blue-shifted yet steep absorption edge respect to the bulk bandgap. However, for monodisperse Se-ZnSe QDs, all absorption features are smeared and a low-energy tail is identified to extend to an energy window below the bulk ZnSe bandgap. Along increasing their size, a cyclic growth of ZnSe QDs switches their surface from Zn-terminated to Se-terminated ones, which confirms that the specific absorption signatures are reproducibly repeated between those of two types of the QDs. Though the extinction coefficients per unit of Se-ZnSe QDs are always larger than those of Zn-ZnSe QDs with the same size, both of them approach the same bulk limit. In addition to contribution of the lattice, extinction coefficients per nanocrystal of Zn-ZnSe QDs show an exponential term against their sizes, which is expected for quantum-confinement enhancement of electron-hole wavefunction overlapping. For Se-ZnSe QDs, there is the third term identified for their extinction coefficients per nanocrystal, which is proportional to the square of size of the QDs and consistent with surface contribution.


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Electronic supplementary material
About this article

Surface and intrinsic contributions to extinction properties of ZnSe quantum dots

Show Author's information Shangxin Lin1,2, Jiongzhao Li2, Chaodan Pu2, Hairui Lei2, Meiyi Zhu2, Haiyan Qin2, Xiaogang Peng2( )
College of Information Science and Technology, Huaqiao University, Xiamen 361021, China
Center for Chemistry of Novel & High-Performance Materials, Department of Chemistry, Zhejiang University, Hangzhou 310027, China

Abstract

This work studies extinction properties of ZnSe quantum dots terminated with either Se-surface or Zn-surface (Se-ZnSe or Zn-ZnSe QDs). In addition to commonly observed photoluminescence quenching by anionic surface sites, Se-ZnSe QDs are found to show drastic signatures of Se-surface states in their UV-visible (Vis) absorption spectra. Similar to most QDs reported in literature, monodisperse Zn-ZnSe QDs show sharp absorption features and blue-shifted yet steep absorption edge respect to the bulk bandgap. However, for monodisperse Se-ZnSe QDs, all absorption features are smeared and a low-energy tail is identified to extend to an energy window below the bulk ZnSe bandgap. Along increasing their size, a cyclic growth of ZnSe QDs switches their surface from Zn-terminated to Se-terminated ones, which confirms that the specific absorption signatures are reproducibly repeated between those of two types of the QDs. Though the extinction coefficients per unit of Se-ZnSe QDs are always larger than those of Zn-ZnSe QDs with the same size, both of them approach the same bulk limit. In addition to contribution of the lattice, extinction coefficients per nanocrystal of Zn-ZnSe QDs show an exponential term against their sizes, which is expected for quantum-confinement enhancement of electron-hole wavefunction overlapping. For Se-ZnSe QDs, there is the third term identified for their extinction coefficients per nanocrystal, which is proportional to the square of size of the QDs and consistent with surface contribution.

Keywords: quantum dots, surface state, extinction coefficient, ZnSe

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Publication history
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Acknowledgements

Publication history

Received: 30 December 2019
Revised: 04 February 2020
Accepted: 06 February 2020
Published: 26 February 2020
Issue date: March 2020

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020

Acknowledgements

This work was funded by the National Key Research and Development Program of China (No. 2016YFB0401600), the National Natural Science Foundation of China (No. 91833303), Joint NSFC-ISF Research (No. 21761142009), and the education department of Fujian Province (No. JA13013).

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