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Time-resolved photoemission spectroscopy of electronic cooling and localization in CH3 NH3 PbI3 crystals

Chen, Zhesheng ; Lee, Min I. ; Zhang, Zailan ; Diab, Hiba ; Garrot, Damien ; Lédée, Ferdinand ; Fertey, Pierre ; Papalazarou, Evangelos ; Marsi, Marino and Ponseca, Carlito LU , et al. (2017) In Physical Review Materials 1(4).
Abstract

We measure the surface of CH3NH3PbI3 single crystals by making use of two-photon photoemission spectroscopy. Our method monitors the electronic distribution of photoexcited electrons, explicitly discriminating the initial thermalization from slower dynamical processes. The reported results disclose the fast-dissipation channels of hot carriers (0.25 ps), set an upper bound to the surface-induced recombination velocity (<4000 cm/s), and reveal the dramatic effect of shallow traps on the electrons dynamics. The picosecond localization of excited electrons in degraded CH3NH3PbI3 samples is consistent with the progressive reduction of photoconversion efficiency in operating devices. Minimizing the density of shallow traps and solving the... (More)

We measure the surface of CH3NH3PbI3 single crystals by making use of two-photon photoemission spectroscopy. Our method monitors the electronic distribution of photoexcited electrons, explicitly discriminating the initial thermalization from slower dynamical processes. The reported results disclose the fast-dissipation channels of hot carriers (0.25 ps), set an upper bound to the surface-induced recombination velocity (<4000 cm/s), and reveal the dramatic effect of shallow traps on the electrons dynamics. The picosecond localization of excited electrons in degraded CH3NH3PbI3 samples is consistent with the progressive reduction of photoconversion efficiency in operating devices. Minimizing the density of shallow traps and solving the aging problem may boost the macroscopic efficiency of solar cells to the theoretical limit.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Materials
volume
1
issue
4
article number
045402
publisher
American Physical Society
external identifiers
  • scopus:85049407738
ISSN
2475-9953
DOI
10.1103/PhysRevMaterials.1.045402
language
English
LU publication?
yes
id
d1914778-ea9d-4737-b87d-0aa80e312a19
date added to LUP
2022-04-04 11:23:17
date last changed
2022-04-20 01:10:09
@article{d1914778-ea9d-4737-b87d-0aa80e312a19,
  abstract     = {{<p>We measure the surface of CH3NH3PbI3 single crystals by making use of two-photon photoemission spectroscopy. Our method monitors the electronic distribution of photoexcited electrons, explicitly discriminating the initial thermalization from slower dynamical processes. The reported results disclose the fast-dissipation channels of hot carriers (0.25 ps), set an upper bound to the surface-induced recombination velocity (&lt;4000 cm/s), and reveal the dramatic effect of shallow traps on the electrons dynamics. The picosecond localization of excited electrons in degraded CH3NH3PbI3 samples is consistent with the progressive reduction of photoconversion efficiency in operating devices. Minimizing the density of shallow traps and solving the aging problem may boost the macroscopic efficiency of solar cells to the theoretical limit.</p>}},
  author       = {{Chen, Zhesheng and Lee, Min I. and Zhang, Zailan and Diab, Hiba and Garrot, Damien and Lédée, Ferdinand and Fertey, Pierre and Papalazarou, Evangelos and Marsi, Marino and Ponseca, Carlito and Deleporte, Emmanuelle and Tejeda, Antonio and Perfetti, Luca}},
  issn         = {{2475-9953}},
  language     = {{eng}},
  number       = {{4}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Materials}},
  title        = {{Time-resolved photoemission spectroscopy of electronic cooling and localization in CH3 NH3 PbI3 crystals}},
  url          = {{http://dx.doi.org/10.1103/PhysRevMaterials.1.045402}},
  doi          = {{10.1103/PhysRevMaterials.1.045402}},
  volume       = {{1}},
  year         = {{2017}},
}