Efficiency improvement of DSSC photoanode by scandium doping of mesoporous titania beads

Latini, A. and Cavallo, C. and Aldibaja, F.K. and Gozzi, D. and Carta, D. and Corrias, A. and Lazzarini, L. and Salviati, G. (2013) Efficiency improvement of DSSC photoanode by scandium doping of mesoporous titania beads. Journal of Physical Chemistry C, 117 (48). pp. 25276-25289. ISSN 1932-7447. (doi:https://doi.org/10.1021/jp409813c) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1021/jp409813c

Abstract

Solid solutions of scandium in anatase as semiconductor material for DSSC photoanodes were prepared by the controlled hydrolysis of titanium(IV) isopropoxide and scandium(III) isopropoxide in hydroalcoholic medium. The final powder was constituted by mesoporous anatase beads doped with Sc. A superstructure characterizes the beads, which are spherical at the microscopic level (?650 nm) and rice-grain-shaped at the nanoscopic level (?20 nm). The BJH pore size distribution and BET surface area of the powder beads were found depending from the Sc content ranging the peak of the former between 7 and 25 nm and between 65 and 128 m2 g–1 the latter. Data obtained by XRD and EXAFS confirm that we are dealing with real solid solutions with ScTi substitution defects. The electronic properties of the synthesized semiconductor material as a function of Sc doping were investigated by the measure of the flat band potential, band gap, and deep levels. In the range 0.0–1.0 at. % of Sc, the flat band energy changes from ?4.15 to ?4.07 eV, whereas the band gap height increases by 0.03 eV. The presence of Sc modifies heavily the cathodoluminescence spectrum of anatase at the lowest concentration too. Several DSSCs with photoanodes at different Sc doping were tested both under solar simulator and in the dark. The maximum efficiency of 9.6% was found at 0.2 at. % of Sc in anatase that is 6.7% higher with respect to the DSSCs with pure anatase.

Item Type: Article
Uncontrolled keywords: Cathodoluminescence spectra, Controlled hydrolysis, Efficiency improvement, Flat band potential, Maximum Efficiency, Mesoporous anatase, Mesoporous titania, Microscopic levels, Electronic properties, Energy gap, Scandium, Scandium compounds, Semiconductor doping, Semiconductor materials, Solid solutions, Titanium dioxide
Subjects: Q Science > QC Physics > QC176.8.N35 Nanoscience, nanotechnology
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Anna Corrias
Date Deposited: 15 Dec 2014 17:12 UTC
Last Modified: 04 Dec 2017 12:23 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46145 (The current URI for this page, for reference purposes)
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