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Article

Quantification of Dyes Generating Photocurrent and/or Photoluminescence in Dye-Sensitized Solar Cells Using Laser Scanning Microscopy

Department of Chemistry, College of Science, Rikkyo University, 3-34-1, Nishiikebukuro, Toshima-ku, Tokyo 171-8501, Japan
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Energies 2020, 13(8), 1866; https://doi.org/10.3390/en13081866
Received: 12 March 2020 / Revised: 23 March 2020 / Accepted: 8 April 2020 / Published: 11 April 2020
(This article belongs to the Special Issue Advanced Dye-Sensitized Solar Cells)
Photoconversion processes such as electron injection (photooxidation) and dye regeneration (reduction) in dye-sensitized solar cells (DSSCs) occur at considerably inhomogeneous semiconductor/dye/electrolyte interfaces, implying a very high heterogeneity of interfacial photoconversion kinetics. Herein, we present a temporally and spatially resolved investigation of DSSCs comprising a cover glass photoanode with a 100-nm thick TiO2 layer loaded with the metal-free organic dye sensitizer MK-2, which is performed by employing laser scanning microscopy (LSM) for the simultaneous measurement of the photocurrent (PC) and photoluminescence (PL) of DSSCs under short-circuit conditions. Analysis of PL decay curves and the excitation rate dependences of PC and PL obtained for local (or submicrometric) areas of the MK-2-DSSC allows disclosing and quantifying three types of dyes coexisting in the DSSCs: (i) a dye that only generates PC (“PC-dye,” 75% of total dye molecules in the DSSC), (ii) a dye that generates both PC and PL (“PCPL-dye,” 20%), and (iii) a dye that only generates PL (“PL-dye,” 5%). Considering recent theoretical reports on cyanoacrylic dyes, we propose that the PC-dye and the PCPL-dye are covalently bound on a TiO2 surface with different adsorption modes (presumably bidentate and tridentate bridging configurations), whereas the PL-dye is noncovalently trapped within a mesoporous TiO2 film. View Full-Text
Keywords: dye-sensitized solar cells; photocurrent; photoluminescence; microscopy dye-sensitized solar cells; photocurrent; photoluminescence; microscopy
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MDPI and ACS Style

Mitsui, M.; Mori, K.; Kobayashi, R. Quantification of Dyes Generating Photocurrent and/or Photoluminescence in Dye-Sensitized Solar Cells Using Laser Scanning Microscopy. Energies 2020, 13, 1866. https://doi.org/10.3390/en13081866

AMA Style

Mitsui M, Mori K, Kobayashi R. Quantification of Dyes Generating Photocurrent and/or Photoluminescence in Dye-Sensitized Solar Cells Using Laser Scanning Microscopy. Energies. 2020; 13(8):1866. https://doi.org/10.3390/en13081866

Chicago/Turabian Style

Mitsui, Masaaki, Kyosuke Mori, and Reina Kobayashi. 2020. "Quantification of Dyes Generating Photocurrent and/or Photoluminescence in Dye-Sensitized Solar Cells Using Laser Scanning Microscopy" Energies 13, no. 8: 1866. https://doi.org/10.3390/en13081866

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