TiO2 Nanotube / Chalcogenide-Based Photoelectrochemical Cell: Nanotube Diameter Dependence Study

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dc.contributor.author Krbal, Miloš
dc.contributor.author Sopha, Hanna Ingrid
dc.contributor.author Podzemná, Veronika
dc.contributor.author Das, Sayantan
dc.contributor.author Přikryl, Jan
dc.contributor.author Macák, Jan M.
dc.date.accessioned 2017-03-06T08:32:50Z
dc.date.available 2017-03-06T08:32:50Z
dc.date.issued 2017-03-03
dc.identifier.issn 1932-7447
dc.identifier.issn 1932-7455
dc.identifier.uri http://hdl.handle.net/10195/66920
dc.description.abstract We present photo-electrochemical results for anodic TiO2 nanotube layers grown with different diameter sizes (21, 35, 56 and 95 nm) with a thickness of approx. 560 nm using a novel anodization protocol. These tube layers were utilized as highly ordered n-type conductive scaffold for the inorganic chromophore Sn-S-Se. While downscaling the nanotube diameter significantly increased the number of nanotubes per square unit (from 5.6E+09 to 7.2E+10 pcs/cm2) and thus the active surface area increased as well, we found that the photo-electrochemical response in the UV light was identical and thus independent of the TiO2 nanotube diameter in the range of nanotube diameters from 35 to 95 nm. Further, we demonstrate that a heterostructured photo-electrochemical cell consisting of TiO2 nanotubes sensitized with crystalline Sn-S-Se chromophore showed higher photocurrent density (from 6 to 32 µA/cm2 for the wavelength of 460 nm) with increasing nanotube diameter size. Upon detailed SEM analyses it was revealed that the Sn-S-Se was infilled in all nanotube layers approximately to one third of the thickness. Therefore, this photocurrent increase with increasing tube diameter can be ascribed to better interfacial contact (and improved charge transport) facilitated between the chromophore and nanotube walls. eng
dc.format p. eng
dc.language.iso en cze
dc.publisher American Chemical Society eng
dc.relation.ispartof The Journal of Physical Chemistry C. 2017.
dc.title TiO2 Nanotube / Chalcogenide-Based Photoelectrochemical Cell: Nanotube Diameter Dependence Study eng
dc.type Article eng
dc.peerreviewed yes eng
dc.publicationstatus postprint eng
dc.identifier.doi 10.1021/acs.jpcc.6b11283
dc.relation.publisherversion http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.6b11283
dc.project.ID EC/H2020/638857/EU/Towards New Generation of Solid-State Photovoltaic Cell: Harvesting Nanotubular Titania and Hybrid Chromophores/CHROMTISOL

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