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Title: Energy band structure of CuInS 2 and optical spectra of CuInS 2 nanocrystals

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [2];  [2]
  1. George Mason Univ., Fairfax, VA (United States)
  2. Naval Research Lab. (NRL), Washington, DC (United States)

Using first principles calculations we describe the energy band structure of bulk CuInS2. The energy band parameters for the multiband effective mass approximation that describes the band edges of this semiconductor are obtained by fitting them to the first principles spectra. Within the multiband effective mass approximation we develop a theoretical description for the structure of band-edge levels and optical properties of the CuInS2 nanocrystals. For the nanocrystals of spherical shape, the optical transitions are weakly allowed between the electron and hole ground states due to the tetragonal symmetry of the crystal lattice, resulting in a large Stokes shift of photoluminescence up to 300 meV in the smallest nanocrystals. In conclusion, this theory of the band-edge optical transitions in CuInS2 NCs can be applied to spherical NCs made of other chalcopyrite compounds.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Advanced Solar Photophysics (CASP)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1371348
Alternate ID(s):
OSTI ID: 1203806
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 3; Related Information: CASP partners with Los Alamos National Laboratory (lead); University of California, Irvine; University of Colorado; Colorado School of Mines; George Mason University; Los Alamos National Laboratory; University of Minnesota; National Renewable Energy Laboratory; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 66 works
Citation information provided by
Web of Science

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Evidence for the Band‐Edge Exciton of CuInS 2 Nanocrystals Enables Record Efficient Large‐Area Luminescent Solar Concentrators journal November 2019
Near-Infrared, Heavy Metal-Free Colloidal “Giant” Core/Shell Quantum Dots journal September 2017
Rational Construction of Z‐Scheme CuInS 2 /Au/g‐C 3 N 4 Heterostructure: Experimental Results and Theoretical Calculation journal October 2019
Prospects of Colloidal Copper Chalcogenide Nanocrystals journal February 2016
Electronic energy band parameters of CuInS e 2 : Landau levels in magnetotransmission spectra journal December 2019
Investigation of AgInS2/ZnS Quantum Dots by Magnetic Circular Dichroism Spectroscopy journal November 2019
Prospects of Colloidal Copper Chalcogenide Nanocrystals journal February 2016