Blocking the charge recombination with diiodide radicals by TiO2 compact layer in dye-sensitized solar cells
(2019) In Journal of the Electrochemical Society 166(9). p.3203-3208- Abstract
The addition of a compact titanium dioxide (TiO2) layer between the fluorine-doped tin oxide (FTO) coated glass substrate and the mesoporous TiO2 layer in the dye-sensitized solar cell (DSC) based on the iodide/triiodide redox couple (I−/I3−) is known to improve its current-voltage characteristics. The compact layer decreases the recombination of electrons extracted through the FTO layer with I3− around the maximum power point. Furthermore, the short-circuit photocurrent was improved, which previously has been attributed to the improved light transmittance and/or better contact between TiO2 and FTO. Here, we demonstrate that the compact TiO2 layer... (More)
The addition of a compact titanium dioxide (TiO2) layer between the fluorine-doped tin oxide (FTO) coated glass substrate and the mesoporous TiO2 layer in the dye-sensitized solar cell (DSC) based on the iodide/triiodide redox couple (I−/I3−) is known to improve its current-voltage characteristics. The compact layer decreases the recombination of electrons extracted through the FTO layer with I3− around the maximum power point. Furthermore, the short-circuit photocurrent was improved, which previously has been attributed to the improved light transmittance and/or better contact between TiO2 and FTO. Here, we demonstrate that the compact TiO2 layer has another beneficial effect: it blocks the reaction between charge carriers in the FTO and photogenerated diiodide radical species (I2−•). Using photomodulated voltammetry, it is demonstrated that the cathodic photocurrent found at bare FTO electrodes is blocked by the addition of a compact TiO2 layer, while the anodic photocurrent due to reaction with I2−• is maintained.
(Less)
- author
- Nonomura, Kazuteru ; Vlachopoulos, Nick ; Unger, Eva LU ; Häggman, Leif ; Hagfeldt, Anders and Boschloo, Gerrit
- organization
- publishing date
- 2019
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of the Electrochemical Society
- volume
- 166
- issue
- 9
- pages
- 3203 - 3208
- publisher
- Electrochemical Society
- external identifiers
-
- scopus:85066898933
- ISSN
- 0013-4651
- DOI
- 10.1149/2.0281909jes
- language
- English
- LU publication?
- yes
- id
- c66aec5f-360c-4ed3-8f7c-2371d07c64f1
- date added to LUP
- 2019-06-25 13:26:58
- date last changed
- 2023-11-19 07:29:14
@article{c66aec5f-360c-4ed3-8f7c-2371d07c64f1, abstract = {{<p>The addition of a compact titanium dioxide (TiO2) layer between the fluorine-doped tin oxide (FTO) coated glass substrate and the mesoporous TiO<sub>2</sub> layer in the dye-sensitized solar cell (DSC) based on the iodide/triiodide redox couple (I<sup>−</sup>/I<sub>3</sub><sup>−</sup>) is known to improve its current-voltage characteristics. The compact layer decreases the recombination of electrons extracted through the FTO layer with I<sub>3</sub><sup>−</sup> around the maximum power point. Furthermore, the short-circuit photocurrent was improved, which previously has been attributed to the improved light transmittance and/or better contact between TiO<sub>2</sub> and FTO. Here, we demonstrate that the compact TiO<sub>2</sub> layer has another beneficial effect: it blocks the reaction between charge carriers in the FTO and photogenerated diiodide radical species (I<sub>2</sub><sup>−•</sup>). Using photomodulated voltammetry, it is demonstrated that the cathodic photocurrent found at bare FTO electrodes is blocked by the addition of a compact TiO<sub>2</sub> layer, while the anodic photocurrent due to reaction with I<sub>2</sub><sup>−•</sup> is maintained.</p>}}, author = {{Nonomura, Kazuteru and Vlachopoulos, Nick and Unger, Eva and Häggman, Leif and Hagfeldt, Anders and Boschloo, Gerrit}}, issn = {{0013-4651}}, language = {{eng}}, number = {{9}}, pages = {{3203--3208}}, publisher = {{Electrochemical Society}}, series = {{Journal of the Electrochemical Society}}, title = {{Blocking the charge recombination with diiodide radicals by TiO<sub>2</sub> compact layer in dye-sensitized solar cells}}, url = {{http://dx.doi.org/10.1149/2.0281909jes}}, doi = {{10.1149/2.0281909jes}}, volume = {{166}}, year = {{2019}}, }