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Photoinduced Charge Carrier Dynamics of Zn-Porphyrin-TiO(2) Electrodes: The Key Role of Charge Recombination for Solar Cell Performance (†).

Imahori, Hiroshi; Kang, Soonchul; Hayashi, Hironobu; Haruta, Mitsutaka; Kurata, Hiroki; Isoda, Seiji; Canton, Sophie LU ; Infahsaeng, Yingyot LU ; Kathiravan, Arunkumar LU and Pascher, Torbjörn LU , et al. (2011) In Journal of physical chemistry. A 115(16). p.3679-3690
Abstract
Time resolved absorption spectroscopy has been used to study photoinduced electron injection and charge recombination in Zn-porphyrin sensitized nanostructured TiO(2) electrodes. The electron transfer dynamics is correlated to the performance of dye sensitized solar cells based on the same electrodes. We find that the dye/semiconductor binding can be described with a heterogeneous geometry where the Zn-porphyrin molecules are attached to the TiO(2) surface with a distribution of tilt angles. The binding angle determines the porphyrin-semiconductor electron transfer distance and charge transfer occurs through space, rather than through the bridge connecting the porphyrin to the surface. For short sensitization times (1 h), there is a direct... (More)
Time resolved absorption spectroscopy has been used to study photoinduced electron injection and charge recombination in Zn-porphyrin sensitized nanostructured TiO(2) electrodes. The electron transfer dynamics is correlated to the performance of dye sensitized solar cells based on the same electrodes. We find that the dye/semiconductor binding can be described with a heterogeneous geometry where the Zn-porphyrin molecules are attached to the TiO(2) surface with a distribution of tilt angles. The binding angle determines the porphyrin-semiconductor electron transfer distance and charge transfer occurs through space, rather than through the bridge connecting the porphyrin to the surface. For short sensitization times (1 h), there is a direct correlation between solar cell efficiency and amplitude of the kinetic component due to long-lived conduction band electrons, once variations in light harvesting (surface coverage) have been taken into account. Long sensitization time (12 h) results in decreased solar cell efficiency because of decreased efficiency of electron injection. (Less)
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publication status
published
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in
Journal of physical chemistry. A
volume
115
issue
16
pages
3679 - 3690
publisher
The American Chemical Society
external identifiers
  • wos:000289697500006
  • pmid:20961148
  • scopus:79955385805
ISSN
1520-5215
DOI
10.1021/jp103747t
language
English
LU publication?
yes
id
a3f1a800-9ea0-47b9-8ac9-9c0d3646844b (old id 1710931)
date added to LUP
2010-11-08 12:38:10
date last changed
2017-11-12 03:41:20
@article{a3f1a800-9ea0-47b9-8ac9-9c0d3646844b,
  abstract     = {Time resolved absorption spectroscopy has been used to study photoinduced electron injection and charge recombination in Zn-porphyrin sensitized nanostructured TiO(2) electrodes. The electron transfer dynamics is correlated to the performance of dye sensitized solar cells based on the same electrodes. We find that the dye/semiconductor binding can be described with a heterogeneous geometry where the Zn-porphyrin molecules are attached to the TiO(2) surface with a distribution of tilt angles. The binding angle determines the porphyrin-semiconductor electron transfer distance and charge transfer occurs through space, rather than through the bridge connecting the porphyrin to the surface. For short sensitization times (1 h), there is a direct correlation between solar cell efficiency and amplitude of the kinetic component due to long-lived conduction band electrons, once variations in light harvesting (surface coverage) have been taken into account. Long sensitization time (12 h) results in decreased solar cell efficiency because of decreased efficiency of electron injection.},
  author       = {Imahori, Hiroshi and Kang, Soonchul and Hayashi, Hironobu and Haruta, Mitsutaka and Kurata, Hiroki and Isoda, Seiji and Canton, Sophie and Infahsaeng, Yingyot and Kathiravan, Arunkumar and Pascher, Torbjörn and Chabera, Pavel and Yartsev, Arkady and Sundström, Villy},
  issn         = {1520-5215},
  language     = {eng},
  number       = {16},
  pages        = {3679--3690},
  publisher    = {The American Chemical Society},
  series       = {Journal of physical chemistry. A},
  title        = {Photoinduced Charge Carrier Dynamics of Zn-Porphyrin-TiO(2) Electrodes: The Key Role of Charge Recombination for Solar Cell Performance (†).},
  url          = {http://dx.doi.org/10.1021/jp103747t},
  volume       = {115},
  year         = {2011},
}