Broadband Defects Emission and Enhanced Ligand Raman Scattering in 0D Cs3Bi2I9 Colloidal Nanocrystals

Giuseppe M. Paterno'; Nimai Mishra; Alex J. Barker; Zhiya Dang; Guglielmo Lanzani; Liberato Manna; Annamaria Petrozza

doi:10.1002/adfm.201805299

Broadband Defects Emission and Enhanced Ligand Raman Scattering in 0D Cs3Bi2I9 Colloidal Nanocrystals

Materials Science 2018-11-20 v1

Authors: Giuseppe M. Paterno' , Nimai Mishra , Alex J. Barker , Zhiya Dang , Guglielmo Lanzani , Liberato Manna , Annamaria Petrozza

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

Excitonic 0D and 2D lead-halide perovskites have been recently developed and investigated as new materials for light generation. Here we report broadband (> 1 eV) emission from newly synthesised zero-dimensional (0D) lead-free colloidal Cs3Bi2I9 nanocrystals. We investigate the nature of their emissive states as well as the relative dynamics which are currently hotly debated. In particular, we find that the broadband emission is made by the coexistence of emissive excitons and sub-bandgap emissive trap-states. Remarkably, we observe evidence of enhanced Raman scattering from the ligands when attached to the nanocrystals surface, an effect that we preliminary attribute to strong exciton-ligands electronic coupling in these systems.

Keywords

cs3bi2i9 nanocrystals zero-dimensional perovskite broadband emission trap states ligand raman scattering exciton-ligand coupling

Cite

@article{arxiv.1811.07638,
  title  = {Broadband Defects Emission and Enhanced Ligand Raman Scattering in 0D Cs3Bi2I9 Colloidal Nanocrystals},
  author = {Giuseppe M. Paterno' and Nimai Mishra and Alex J. Barker and Zhiya Dang and Guglielmo Lanzani and Liberato Manna and Annamaria Petrozza},
  journal= {arXiv preprint arXiv:1811.07638},
  year   = {2018}
}

Broadband Defects Emission and Enhanced Ligand Raman Scattering in 0D Cs3Bi2I9 Colloidal Nanocrystals

Abstract

Keywords

Cite

Related papers