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  4. Ga3+ and Y3+ Cationic Substitution in Mesoporous TiO2 Photoanodes for Photovoltaic Applications
 
research article

Ga3+ and Y3+ Cationic Substitution in Mesoporous TiO2 Photoanodes for Photovoltaic Applications

Chandiran, Aravind Kumar  
•
Sauvage, Frédéric  
•
Etgar, Lioz  
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2011
Journal of Physical Chemistry C

The optoelectronic properties of transparent nanocrystalline TiO2 films were modified by the incorporation of a low level of Ga3+ 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.

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Type
research article
DOI
10.1021/jp1121068
Web of Science ID

WOS:000290127200048

Author(s)
Chandiran, Aravind Kumar  
•
Sauvage, Frédéric  
•
Etgar, Lioz  
•
Grätzel, Michaël  
Date Issued

2011

Publisher

American Chemical Society

Published in
Journal of Physical Chemistry C
Volume

115

Issue

18

Start page

9232

End page

9240

Subjects

DSSC

•

TiO2

•

doping

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPI  
Available on Infoscience
April 15, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/66500
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