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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Correlating structure and electronic band-edge properties in organolead halide perovskites nanoparticles

Author

  • Qiushi Zhu
  • Kaibo Zheng
  • Mohamed Qenawy
  • Alexander Generalov
  • Dörthe Haase
  • Stefan Carlson
  • Yuran Niu
  • Jimmy Heimdal
  • Anders Engdahl
  • Maria E. Messing
  • Tönu Pullerits
  • Sophie E. Canton

Summary, in English

After having emerged as primary contenders in the race for highly efficient optoelectronics materials, organolead halide perovskites (OHLP) are now being investigated in the nanoscale regime as promising building blocks with unique properties. For example, unlike their bulk counterpart, quantum dots of OHLP are brightly luminescent, owing to large exciton binding energies that cannot be rationalized solely on the basis of quantum confinement. Here, we establish the direct correlation between the structure and the electronic band-edge properties of CH3NH3PbBr3 nanoparticles. Complementary structural and spectroscopic measurements probing long-range and local order reveal that lattice strain influences the nature of the valence band and modifies the subtle stereochemical activity of the Pb2+ lone-pair. More generally, this work demonstrates that the stereochemical activity of the lone-pair at the metal site is a specific physicochemical parameter coupled to composition, size and strain, which can be employed to engineer novel functionalities in OHLP nanomaterials.

Department/s

  • Synchrotron Radiation Research
  • Chemical Physics
  • MAX IV Laboratory
  • Solid State Physics
  • NanoLund: Center for Nanoscience

Publishing year

2016

Language

English

Pages

14933-14940

Publication/Series

Physical Chemistry Chemical Physics

Volume

18

Issue

22

Document type

Journal article

Publisher

Royal Society of Chemistry

Topic

  • Physical Chemistry
  • Condensed Matter Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1463-9076