Ga3+ and Y3+ cationic substitution in mesoporous TiO2 photoanodes for photovoltaic applications

Aravind Kumar Chandiran, Frédéric Sauvage*, Lioz Etgar, Michael Graetzel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

The optoelectronic properties of transparent nanocrystalline TiO 2 films were modified by the incorporation of a low level of Ga 3+ or Y3+ cations. After optimizing their relative concentration level, we were able to increase in a noticeable manner the power conversion efficiency from 7.4% to 8.1% for gallium and even to 9.0% in the case of yttrium where all three photovoltaic (PV) performance parameters were improved simultaneously. The beneficial effect of gallium and yttrium on the PV characteristics is attributed to a lower electrical resistance and longer electron lifetime enhancing the charge collection efficiency in the transparent layer. We also herein demonstrate that the substitution of the titanium site by a trivalent element in the benchmark TiO2 enables the disposal of the "magic" TiCl4(aq) post-treatment. The potential of this approach was also confirmed in solid-state PbS quantum-dot (QD) solar cells. In particular, a gallium-containing TiO2 anatase photoanode generated twice as much short-circuit photocurrent density as the standard electrode. A 1.9% power conversion efficiency has been achieved by using a solid-state heterojunction of the doped TiO2 with a 100 nm of PbS QD overlayer and using a gold back contact.

Original languageAmerican English
Pages (from-to)9232-9240
Number of pages9
JournalJournal of Physical Chemistry C
Volume115
Issue number18
DOIs
StatePublished - 12 May 2011
Externally publishedYes

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