Linear Absorption in CdSe Nanoplates: Thickness and Lateral Size Dependency of the Intrinsic Absorption

We investigate the optical absorption properties of colloidal CdSe nanoplatelets and compare them to CdSe quantum dots. Starting from inductively coupled plasma–atomic emission spectroscopy (ICP-AES) measurements on their intrinsic absorption coefficients μi, we compare these results with a theoretical approach by a continuum absorption Lorentz local field model. We show that the platelets’ intrinsic absorption coefficients μi are strongly thickness and aspect ratio dependent, which results in the possibility to tune the absorption properties of this material class by the lateral size and thickness. The continuum intrinsic absorbance of the platelets is considerably larger if compared with quantum dots making them more efficient absorbers with higher light–matter interaction that is essential for their use in, for example, solar cells. The obtained μi values can be used for concentration determination of CdSe nanoplatelets in solution and solid films which is essential for all optical experiments with con...

[1]  A. Samoc,et al.  Dispersion of refractive properties of solvents: Chloroform, toluene, benzene, and carbon disulfide in ultraviolet, visible, and near-infrared , 2003 .

[2]  Akihiko Yoshikawa,et al.  Proposal and achievement of novel structure InN∕GaN multiple quantum wells consisting of 1 ML and fractional monolayer InN wells inserted in GaN matrix , 2007 .

[3]  Qiang Zhao,et al.  Optical Properties of Zincblende Cadmium Selenide Quantum Dots , 2010 .

[4]  Xiaogang Peng,et al.  Experimental Determination of the Extinction Coefficient of CdTe, CdSe, and CdS Nanocrystals , 2003 .

[5]  M. Artemyev,et al.  Linear and Two-Photon Absorption in Zero- and One-Dimensional CdS Nanocrystals: Influence of Size and Shape , 2013 .

[6]  S. Adachi,et al.  Optical properties of cubic and hexagonal CdSe , 1995 .

[7]  B. Dubertret,et al.  Continuous transition from 3D to 1D confinement observed during the formation of CdSe nanoplatelets. , 2011, Journal of the American Chemical Society.

[8]  Benoit Dubertret,et al.  Quasi 2D colloidal CdSe platelets with thicknesses controlled at the atomic level. , 2008, Journal of the American Chemical Society.

[9]  E. Weiss,et al.  Organic Surfactant-Controlled Composition of the Surfaces of CdSe Quantum Dots , 2010 .

[10]  J. L. Movilla,et al.  One- and Two-Photon Absorption in CdS Nanodots and Wires: The Role of Dimensionality in the One- and Two-Photon Luminescence Excitation Spectrum , 2015 .

[11]  B. Dubertret,et al.  Colloidal nanoplatelets with two-dimensional electronic structure. , 2011, Nature materials.

[12]  Sandrine Ithurria,et al.  Carrier cooling in colloidal quantum wells. , 2012, Nano letters.

[13]  Benoit Dubertret,et al.  Flat Colloidal Semiconductor Nanoplatelets , 2013 .

[14]  U. Banin,et al.  Size dependence of molar absorption coefficients of CdSe semiconductor quantum rods. , 2009, Chemphyschem : a European journal of chemical physics and physical chemistry.

[15]  V. Protasenko,et al.  Experimental determination of the absorption cross-section and molar extinction coefficient of CdSe and CdTe nanowires. , 2006, The journal of physical chemistry. B.

[16]  Dmitri V Talapin,et al.  Low-threshold stimulated emission using colloidal quantum wells. , 2013, Nano letters.

[17]  Sandrine Ithurria,et al.  Two-dimensional electronic spectroscopy of CdSe nanoparticles at very low pulse power. , 2013, The Journal of chemical physics.

[18]  S. Bals,et al.  Conformal and Atomic Characterization of Ultrathin CdSe Platelets with a Helical Shape , 2014, Nano letters.

[19]  Xiaogang Peng,et al.  Size/shape-controlled synthesis of colloidal CdSe quantum disks: ligand and temperature effects. , 2011, Journal of the American Chemical Society.

[20]  Sung Jun Lim,et al.  Surface-dependent, ligand-mediated photochemical etching of CdSe nanoplatelets. , 2012, Journal of the American Chemical Society.

[21]  Benoit Dubertret,et al.  Core/shell colloidal semiconductor nanoplatelets. , 2012, Journal of the American Chemical Society.

[22]  Y. Kawazoe,et al.  Ultra-stable nanoparticles of CdSe revealed from mass spectrometry , 2004, Nature materials.

[23]  Andrei Schliwa,et al.  Electronic structure and exciton-phonon interaction in two-dimensional colloidal CdSe nanosheets. , 2012, Nano letters.

[24]  I. Moreels,et al.  Size-dependent optical properties of colloidal PbS quantum dots. , 2009, ACS nano.

[25]  K. Ramasamy,et al.  Low-Temperature Synthesis of Magic-Sized CdSe Nanoclusters: Influence of Ligands on Nanocluster Growth and Photophysical Properties , 2012 .

[26]  M. V. Ermolenko,et al.  Electroabsorption by 0D, 1D, and 2D nanocrystals: a comparative study of CdSe colloidal quantum dots, nanorods, and nanoplatelets. , 2014, ACS nano.

[27]  Klein,et al.  Optical properties of zinc-blende CdSe and ZnxCd1-xSe films grown on GaAs. , 1994, Physical review. B, Condensed matter.

[28]  Yang Tian,et al.  Synthesis of Ultrathin and Thickness-Controlled Cu2-xSe Nanosheets via Cation Exchange. , 2014, The journal of physical chemistry letters.

[29]  Haiyan Qin,et al.  Uniform thickness and colloidal-stable CdS quantum disks with tunable thickness: Synthesis and properties , 2012, Nano Reseach.

[30]  Moungi G. Bawendi,et al.  On the Absorption Cross Section of CdSe Nanocrystal Quantum Dots , 2002 .

[31]  I. Moreels,et al.  Light absorption by colloidal semiconductor quantum dots , 2012 .

[32]  Marco Califano,et al.  Re-examination of the Size-Dependent Absorption Properties of CdSe Quantum Dots , 2009 .