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Weihua Lin. Portrait.

Weihua Lin

Postdoctoral fellow

Weihua Lin. Portrait.

Combining two-photon photoemission and transient absorption spectroscopy to resolve hot carrier cooling in 2D perovskite single crystals : the effect of surface layer

Author

  • Weihua Lin
  • Mingli Liang
  • Yuran Niu
  • Zhesheng Chen
  • Marie Cherasse
  • Jie Meng
  • Xianshao Zou
  • Qian Zhao
  • Huifang Geng
  • Evangelos Papalazarou
  • Marino Marsi
  • Luca Perfetti
  • Sophie E. Canton
  • Kaibo Zheng
  • Tönu Pullerits
Show all

Summary, in English

We investigate hot carrier (HC) cooling in two-dimensional (2D) perovskite single crystals by applying two complementary ultrafast spectroscopy techniques - transient absorption (TA) and time-resolved two-photon photoemission (TR-2PPE) spectroscopies. TR-2PPE directly maps the hot electron distribution and its dynamics in the conduction band to the detected photoelectron distribution. While TR-2PPE selectively probes the upper layer of the material, TA provides information on the whole bulk. Two cooling regimes are resolved in both techniques. The fast timescale of 100-200 fs is related to the electron scattering by longitudinal optical (LO) phonons and the slow timescale of 3-4 ps corresponds to the LO phonon relaxation. The HC cooling dynamic of TA measurement has faster initial stage and higher starting temperature for the slower stage than in TR-2PPE measurements. Conclusions about spatial sensitivity of the cooling dynamics across the 2D perovskite single crystals constitute valuable information that can guide the future development of HC solar cells and thermoelectric applications based on 2D perovskites.

Department/s

  • LTH Profile Area: Nanoscience and Semiconductor Technology
  • Chemical Physics
  • NanoLund: Centre for Nanoscience
  • MAX IV Laboratory
  • LTH Profile Area: Photon Science and Technology

Publishing year

2022-10-25

Language

English

Pages

16751-16760

Publication/Series

Journal of Materials Chemistry C

Volume

10

Issue

44

Document type

Journal article

Publisher

Royal Society of Chemistry

Topic

  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Other

  • ISSN: 2050-7526