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Large Band Edge Tunability in Colloidal Nanoplatelets.
Zhou, Qunfei; Cho, Yeongsu; Yang, Shenyuan; Weiss, Emily A; Berkelbach, Timothy C; Darancet, Pierre.
Afiliación
  • Zhou Q; Materials Research Science and Engineering Center , Northwestern University , Evanston , Illinois 60208 , United States.
  • Cho Y; Center for Nanoscale Materials , Argonne National Laboratory , Argonne , Illinois 60439 , United States.
  • Yang S; Department of Chemistry and James Franck Institute , University of Chicago , Chicago , Illinois 60637 , United States.
  • Weiss EA; State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors , Chinese Academy of Sciences , Beijing 100083 , China.
  • Berkelbach TC; Center for Materials Science and Optoelectronics Engineering , University of Chinese Academy of Sciences , Beijing 100049 , China.
  • Darancet P; Department of Chemistry and Department of Materials Science and Engineering , Northwestern University , Evanston , Illinois 60208 , United States.
Nano Lett ; 19(10): 7124-7129, 2019 10 09.
Article en En | MEDLINE | ID: mdl-31545615
We study the impact of organic surface ligands on the electronic structure and electronic band edge energies of quasi-two-dimensional (2D) colloidal cadmium selenide nanoplatelets (NPLs) using density functional theory. We show how control of the ligand and ligand-NPL interface dipoles results in large band edge energy shifts, over a range of 5 eV for common organic ligands with a minor effect on the NPL band gaps. Using a model self-energy to account for the dielectric contrast and an effective mass model of the excitons, we show that the band edge tunability of NPLs together with the strong dependence of the optical band gap on NPL thickness can lead to favorable photochemical and optoelectronic properties.
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Texto completo: 1 Base de datos: MEDLINE Idioma: En Revista: Nano Lett Año: 2019 Tipo del documento: Article País de afiliación: Estados Unidos

Texto completo: 1 Base de datos: MEDLINE Idioma: En Revista: Nano Lett Año: 2019 Tipo del documento: Article País de afiliación: Estados Unidos