Abstract
In this investigation, the effect of concentration of TiCl
4
for the post-treatment of hydrothermally synthesized titania nanotubes-based working electrode for dye-sensitized solar cells has been studied. Hydrothermally synthesized TiO
2
nanotubes were treated with different concentrations of TiCl
4
to investigate the effect of TiCl
4
concentration. The solar cell performance increased with the increase in TiCl
4
concentration up to 0.5 M and leveled off. The best solar cell showed a short-circuit current density (
J
sc
), open-circuit voltage (
V
oc
), fill factor (FF) and efficiency (
η
) of 12.75 mA/cm
2
, 795 mV, 69.2 % and 7.04 %, respectively, while untreated TiO
2
nanotube showed
J
sc
,
V
oc
, FF and
η
of 2.4 mA/cm
2
, 899 mV, 78.9 % and 1.7 %, respectively.