Energy band structure of and optical spectra of nanocrystals
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- George Mason Univ., Fairfax, VA (United States)
- 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) (SC-22)
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1371348
- Alternate ID(s):
- OSTI ID: 1203806
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 3 Vol. 92; ISSN 1098-0121
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Evidence for the Band-Edge Exciton of CuInS2 Nanocrystals Enables Record Efficient Large-Area Luminescent Solar Concentrators
Synthesis and characteristics of spray deposited CuInS{sub 2} nanocrystals thin films for photovoltaic applications
Journal Article
·
Thu Nov 14 19:00:00 EST 2019
· Advanced Functional Materials
·
OSTI ID:2337651
Synthesis and characteristics of spray deposited CuInS{sub 2} nanocrystals thin films for photovoltaic applications
Journal Article
·
Tue Oct 15 00:00:00 EDT 2013
· Materials Research Bulletin
·
OSTI ID:22285159