Plasmonic Effect of Ag Nanoparticles on Polymethine Dyes Sensitized Titanium Dioxide

Niyazbek Ibrayev,1*,Email 

Gulden Omarova,1 

Evgeniya Seliverstova,1 

Alexander Ishchenko,2 

Nurxat Nuraje3*Email

1Institute of Molecular Nanophotonics, E.A. Buketov Karaganda State University, 100028 Karaganda, Kazakhstan
2Institute of Organic Chemistry, NAS of Ukraine, 02660 Kyiv, Ukraine
3School of Engineering and Digital Sciences, Nazarbayev University, 010000 Nur-Sultan, Kazakhstan


The effect of core@shell nanostructure of Ag@TiO2 on the spectral-luminescence properties of polymethine dye (PD) functionalized with sulfonate group and its photovoltaic properties in the PD dye-sensitized solar cell were investigated. Quenching in the fluorescence intensity of PDs molecule by almost 3 times was observed for the dye-absorbed titanium dioxide porous film. Furthermore, the decreasing effect in fluorescence lifetime was found to be significant for the PD molecules modified with functional groups. In the presence of Ag@TiO2 nanoparticles (NPs), an increase in the luminescence intensity of PD by 60 – 90 % was observed. A mechanism of plasmon nanoparticles’ effect on the decay of the excited states of dye molecules was proposed. The efficiency of PD-sensitized solar cells was increased by 1.2 times for PD 1 and 2.0 times for PD 2. The enhancement in the efficiency is result from the growth in the spectral sensitivity of solar cell in the region of 400 – 450 and 600 – 700 nm and a change in the charge-transport parameters of TiO2 films. This increase was supported by a decrease in the resistance at the semiconductor–dye interface by 8.2 times for PD 1 and 22.4 times for PD 2 that leads to the growth in the part of photoelectrons reaching the counter electrode in solar cell with plasmon NPs.

Plasmonic Effect of Ag Nanoparticles on Polymethine Dyes Sensitized Titanium Dioxide