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Carrier motion in as-spun and annealed P3HT:PCBM blends revealed by ultrafast optical electric field probing and Monte Carlo simulations

Abramavicius, Vytautas; Vithanage, Dimali LU ; Devizis, Andrius; Infahsaeng, Yingyot LU ; Bruno, Annalisa; Foster, Samuel; Keivanidis, Panagiotis E.; Abramavicius, Darius; Nelson, Jenny and Yartsev, Arkady LU , et al. (2014) In Physical Chemistry Chemical Physics 16(6). p.2686-2692
Abstract
Charge transport dynamics in solar cell devices based on as-spun and annealed P3HT:PCBM films are compared using ultrafast time-resolved optical probing of the electric field by means of field-induced second harmonic generation. The results show that charge carriers drift about twice as far during the first 3 ns after photogeneration in a device where the active layer has been thermally annealed. The carrier dynamics were modelled using Monte-Carlo simulations and good agreement between experimental and simulated drift dynamics was obtained using identical model parameters for both cells, but with different average PCBM and polymer domain sizes. The calculations suggest that small domain sizes in as-spun samples limit the carrier... (More)
Charge transport dynamics in solar cell devices based on as-spun and annealed P3HT:PCBM films are compared using ultrafast time-resolved optical probing of the electric field by means of field-induced second harmonic generation. The results show that charge carriers drift about twice as far during the first 3 ns after photogeneration in a device where the active layer has been thermally annealed. The carrier dynamics were modelled using Monte-Carlo simulations and good agreement between experimental and simulated drift dynamics was obtained using identical model parameters for both cells, but with different average PCBM and polymer domain sizes. The calculations suggest that small domain sizes in as-spun samples limit the carrier separation distance disabling their escape from geminate recombination. (Less)
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Contribution to journal
publication status
published
subject
in
Physical Chemistry Chemical Physics
volume
16
issue
6
pages
2686 - 2692
publisher
Royal Society of Chemistry
external identifiers
  • wos:000329926700050
  • scopus:84892621540
ISSN
1463-9084
DOI
10.1039/c3cp54605e
language
English
LU publication?
yes
id
1746db98-6638-4e7d-9526-339694874792 (old id 4319151)
date added to LUP
2014-02-25 14:54:57
date last changed
2017-11-05 03:59:13
@article{1746db98-6638-4e7d-9526-339694874792,
  abstract     = {Charge transport dynamics in solar cell devices based on as-spun and annealed P3HT:PCBM films are compared using ultrafast time-resolved optical probing of the electric field by means of field-induced second harmonic generation. The results show that charge carriers drift about twice as far during the first 3 ns after photogeneration in a device where the active layer has been thermally annealed. The carrier dynamics were modelled using Monte-Carlo simulations and good agreement between experimental and simulated drift dynamics was obtained using identical model parameters for both cells, but with different average PCBM and polymer domain sizes. The calculations suggest that small domain sizes in as-spun samples limit the carrier separation distance disabling their escape from geminate recombination.},
  author       = {Abramavicius, Vytautas and Vithanage, Dimali and Devizis, Andrius and Infahsaeng, Yingyot and Bruno, Annalisa and Foster, Samuel and Keivanidis, Panagiotis E. and Abramavicius, Darius and Nelson, Jenny and Yartsev, Arkady and Sundström, Villy and Gulbinas, Vidmantas},
  issn         = {1463-9084},
  language     = {eng},
  number       = {6},
  pages        = {2686--2692},
  publisher    = {Royal Society of Chemistry},
  series       = {Physical Chemistry Chemical Physics},
  title        = {Carrier motion in as-spun and annealed P3HT:PCBM blends revealed by ultrafast optical electric field probing and Monte Carlo simulations},
  url          = {http://dx.doi.org/10.1039/c3cp54605e},
  volume       = {16},
  year         = {2014},
}