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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Direct Experimental Evidence for Photoinduced Strong-Coupling Polarons in Organolead Halide Perovskite Nanoparticles

Author

  • Kaibo Zheng
  • Mohamed Abdellah
  • Qiushi Zhu
  • Qingyu Kong
  • Guy Jennings
  • Charles A. Kurtz
  • Maria E. Messing
  • Yuran Niu
  • David J. Gosztola
  • Mohammed J. Al-Marri
  • Xiaoyi Zhang
  • Tönu Pullerits
  • Sophie E. Canton

Summary, in English

Echoing the roaring success of their bulk counterparts, nano-objects built from organolead halide perovskites (OLHP) present bright prospects for surpassing the performances of their conventional organic and inorganic analogues in photodriven technologies. Unraveling the photoinduced charge dynamics is essential for optimizing the optoelectronic functionalities. However, mapping the carrier-lattice interactions remains challenging, owing to their manifestations on multiple length scales and time scales. By correlating ultrafast time-resolved optical and X-ray absorption measurements, this work reveals the photoinduced formation of strong-coupling polarons in CH3NH3PbBr3 nanoparticles. Such polarons originate from the self-trapping of electrons in the Coulombic field caused by the displaced inorganic nuclei and the oriented organic cations. The transient structural change detected at the Pb L3 X-ray absorption edge is well-captured by a distortion with average bond elongation in the [PbBr6]2- motif. General implications for designing novel OLHP nanomaterials targeting the active utilization of these quasi-particles are outlined.

Department/s

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

Publishing year

2016-11-17

Language

English

Pages

4535-4539

Publication/Series

The Journal of Physical Chemistry Letters

Volume

7

Issue

22

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Physical Chemistry
  • Condensed Matter Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1948-7185