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Unraveling Charge Carriers Generation, Diffusion, and Recombination in Formamidinium Lead Triiodide Perovskite Polycrystalline Thin Film.

Piatkowski, Piotr; Cohen, Boiko; Ponseca, Carlito LU ; Salado, Manuel; Kazim, Samrana; Ahmad, Shahzada; Sundström, Villy LU and Douhal, Abderrazzak (2016) In The Journal of Physical Chemistry Letters 7(1). p.204-210
Abstract
We report on studies of the formamidinium lead triiodide (FAPbI3) perovskite film using time-resolved terahertz (THz) spectroscopy (TRTS) and flash photolysis to explore charge carriers generation, migration, and recombination. The TRTS results show that upon femtosecond excitation above the absorption edge, the initial high photoconductivity (∼75 cm(2) V(-1) s(-1)) remains constant at least up to 8 ns, which corresponds to a diffusion length of 25 μm. Pumping below the absorption edge results in a mobility of 40 cm(2) V(-1) s(-1) suggesting lower mobility of charge carriers located at the bottom of the conduction band or shallow sub-bandgap states. Furthermore, analysis of the THz kinetics reveals rising components of <1 and 20 ps,... (More)
We report on studies of the formamidinium lead triiodide (FAPbI3) perovskite film using time-resolved terahertz (THz) spectroscopy (TRTS) and flash photolysis to explore charge carriers generation, migration, and recombination. The TRTS results show that upon femtosecond excitation above the absorption edge, the initial high photoconductivity (∼75 cm(2) V(-1) s(-1)) remains constant at least up to 8 ns, which corresponds to a diffusion length of 25 μm. Pumping below the absorption edge results in a mobility of 40 cm(2) V(-1) s(-1) suggesting lower mobility of charge carriers located at the bottom of the conduction band or shallow sub-bandgap states. Furthermore, analysis of the THz kinetics reveals rising components of <1 and 20 ps, reflecting dissociation of excitons having different binding energies. Flash photolysis experiments indicate that trapped charge carriers persist for milliseconds. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Letters
volume
7
issue
1
pages
204 - 210
publisher
The American Chemical Society
external identifiers
  • pmid:26703885
  • wos:000367968700035
  • scopus:84954062094
ISSN
1948-7185
DOI
10.1021/acs.jpclett.5b02648
language
English
LU publication?
yes
id
67a18c55-8b37-4244-81b5-c35a1a0b3e21 (old id 8503572)
date added to LUP
2016-01-07 17:12:58
date last changed
2017-11-12 03:50:20
@article{67a18c55-8b37-4244-81b5-c35a1a0b3e21,
  abstract     = {We report on studies of the formamidinium lead triiodide (FAPbI3) perovskite film using time-resolved terahertz (THz) spectroscopy (TRTS) and flash photolysis to explore charge carriers generation, migration, and recombination. The TRTS results show that upon femtosecond excitation above the absorption edge, the initial high photoconductivity (∼75 cm(2) V(-1) s(-1)) remains constant at least up to 8 ns, which corresponds to a diffusion length of 25 μm. Pumping below the absorption edge results in a mobility of 40 cm(2) V(-1) s(-1) suggesting lower mobility of charge carriers located at the bottom of the conduction band or shallow sub-bandgap states. Furthermore, analysis of the THz kinetics reveals rising components of &lt;1 and 20 ps, reflecting dissociation of excitons having different binding energies. Flash photolysis experiments indicate that trapped charge carriers persist for milliseconds.},
  author       = {Piatkowski, Piotr and Cohen, Boiko and Ponseca, Carlito and Salado, Manuel and Kazim, Samrana and Ahmad, Shahzada and Sundström, Villy and Douhal, Abderrazzak},
  issn         = {1948-7185},
  language     = {eng},
  number       = {1},
  pages        = {204--210},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Letters},
  title        = {Unraveling Charge Carriers Generation, Diffusion, and Recombination in Formamidinium Lead Triiodide Perovskite Polycrystalline Thin Film.},
  url          = {http://dx.doi.org/10.1021/acs.jpclett.5b02648},
  volume       = {7},
  year         = {2016},
}