Effect of co-adsorbate and hole transporting layer on the photoinduced charge separation at the TiO2-phthalocyanine interface
Entity
UAM. Departamento de Química Orgánica; Instituto de Investigación Avanzada en Ciencias Químicas (IADChem)Publisher
American Chemical SocietyDate
2018-05-31Citation
10.1021/acsomega.8b00600
ACS Omega 3.5 (2018): 4947-4958
ISSN
2470-1343DOI
10.1021/acsomega.8b00600Funded by
K.V. acknowledges the Doctoral Programme of Tampere University of Technology for the financial support. N.V.T. acknowledges NATO SPS project no. 985043. Financial support from Comunidad de Madrid, Spain (S2013/MIT2841, FOTOCARBON) and MINECO, Spain (CTQ2014- 52869-P and CTQ2017-85393-P) is acknowledged. IMDEA Nanociencia acknowledges support from the “Severo Ochoa” Programme for Centres of Excellence in R&D (MINECO, grant SEV-2016-0686).Project
Comunidad de Madrid. S2013/MIT2841/FOTOCARBON; Gobierno de España. CTQ2014- 52869-P; Gobierno de España. CTQ2017-85393-P; Gobierno de España. SEV-2016-0686Editor's Version
https://doi.org/10.1021/acsomega.8b00600Subjects
Charge separation (CS); Photoreactions; Phthalocyanines (Pcs); Pc-sensitized DSSC; Spectroscopy; Layer of TiO2nanoparticle; Transporting material; QuímicaRights
© Copyright 2018 American Chemical Society.Abstract
Understanding the primary processes of charge separation (CS) in solid-state dye-sensitized solar cells (DSSCs) and, in particular, analysis of the efficiency losses during these primary photoreactions is essential for designing new and efficient photosensitizers. Phthalocyanines (Pcs) are potentially interesting sensitizers having absorption in the red side of the optical spectrum and known to be efficient electron donors. However, the efficiencies of Pc-sensitized DSSCs are lower than that of the best DSSCs, which is commonly attributed to the aggregation tendency of Pcs. In this study, we employ ultrafast spectroscopy to discover why and how much does the aggregation affect the efficiency. The samples were prepared on a standard fluorine-doped tin oxide (FTO) substrates covered by a porous layer of TiO2nanoparticles, functionalized by a Pc sensitizer and filled by a hole transporting material (Spiro-MeOTAD). The study demonstrates that the aggregation can be suppressed gradually by using co-adsorbates, such as chenodeoxycholic acid (CDCA) and oleic acid, but rather high concentrations of co-adsorbate is required. Gradually, a few times improvement of quantum efficiency was observed at sensitizer/co-adsorbate ratio Pc/CDCA = 1:10 and higher. The time-resolved spectroscopy studies were complemented by standard photocurrent measurements of the same sample structures, which also confirmed gradual increase in photon-to-current conversion efficiency on mixing Pc with CDCA
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Google Scholar:Virkki, Kirsi
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Tervola, Essi
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Medel, Maria
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Torres Cebada, Tomás
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Tkachenko, Nikolai V.
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