Abstract
This paper describes cooperate the co-absorbance (CdS QDs) and the plasmonic core-shell nanoparticles (Ag@PVP) of dye synthesized solar cells in which CdS QDs and Ag@PVP are incorporated into the TiO2 layer. Cooperative nanoparticles show superior behavior on enhancing light absorption in comparison with reference cells. Cooperated DSSC exhibits the best performance with the power conversion efficiency of 7.64% which is superior to that of the free–modified DSSC with the PCE of 5%. Detailed studies offer an effective approach to enhance the efficiency of dye synthesized solar cells.
Highlights
The dye-sensitized solar cells (DSSCs) have been regarded as a promising branch of study contrasted to conventional silicon-based photovoltaic devices for sustainable energy supply at low cost and high environmental friendliness[1]
In order to investigate the effect of CdS quantum dots (QDs) and Ag@PVP NPs in DSSCs, we first optimized device performance based on Ag@PVP NPs, and we investigate their cooperative effect on DSCs performance a case by case
LSPR induced near field enhancement leads to heightened light absorption of active layer materials of DSCs and benefits charge separation and transport, resulting in increased charge carrier density
Summary
The dye-sensitized solar cells (DSSCs) have been regarded as a promising branch of study contrasted to conventional silicon-based photovoltaic devices for sustainable energy supply at low cost and high environmental friendliness[1]. Some quantum dots (QDs) such as CdS, CdSe, CdTe, PbS and so on, which absorb light in the visible range, can serve as co-sensitizers so after absorption of a photon with enough energy, they are able to transfer electrons to the conduction band of TiO26. Among these QDs, CdS with suitable band gap and band positions compared to the conduction band of TiO2 can create a long distance charge separated states with electron and hole at sites far from each other, so it’s proper for using in these devices, in order to improve energy conversion efficiency of QDSSCs13,14. QDs show significant absorption between 200–300 nm, while N719 dye molecules show absorption in 313 nm and 500–560 nm, and Ag@PVP NPs have absorption in 350–450 nm (Fig. 1)
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